text:
Amber Fanthome, Denis Voronin, Mark J. Taylor
Liverpool School of Tropical Medicine, Liverpool, United Kingdom
River blindness (Onchocerca volvulus) and elephantiasis (Wuchereria
bancrofti and Brugia malayi) affect over 150 million people in more than
80 countries, with a further 1 billion at risk of infection. Each of these
nematode parasites has evolved a mutualistic association with the bacterial
503 developing alternative plans. It can also be used to simulate the impact
of applying combination therapies, drugs with different pharmacokinetics
DEVELOPMENT OF A SMALL ANIMAL MODEL parameters and different potencies and modes of action. As an example,
OF ONCHOCERCIASIS FOR THE SCREENING OF we show a case study where the model predicts the treatment outcomes
MACROFILARICIDAL DRUGS in endemic areas when using ivermectin alone or a combination of
ivermectin and doxycycline. The modelling shows that the use of a
Alice Halliday1, Haelly Mejane Metuge2, Winston Patrick combination of ivermectin and doxycycline treatment vastly increases the
Chounna Ndongmo2, Jonas Arnauld Kengne-Ouafo2, Tayong chances of elimination success. The use of a macrofilaricidal drug such as
Dizzle Bita Kwenti2, Ana Guimaraes1, Hayley Tyrer1, Peter Enyong2, doxycycline shows a much higher potential in achieving overall elimination
Mark Taylor1, Samuel Wanji2, Joseph Turner1 than microfilaricidal drugs (such as ivermectin) alone which agrees with
Liverpool School of Tropical Medicine, Liverpool, United Kingdom, previous computer models
Research Foundation for Tropical Diseases and the Environment, Buea,
Cameroon 505
Onchocerciasis affects >37 million people with approximately
800,000 suffering visual impairment (river blindness). Development LASER DIFFRACTION ASSAY FOR LOW RESOURCE
of macrofilaricides for onchocerciasis is hampered by the lack of a QUANTIFICATION OF MICROFILARIAL BURDEN
facile animal model. Our laboratories and others have demonstrated Philip J. Budge1, David W. Wright2
protracted survival of non-murine filariae in immune-compromised mice. 1
Washington University School of Medicine, St. Louis, MO, United States,
Therefore we tested whether cattle-sourced Onchocerca could persist 2
Vanderbilt University, Nashville, TN, United States
in Severe-Combined Immuno Deficient (SCID) mice. O. ochengi nodules
were harvested from the skins of infected cattle while infective L3 were Efforts to eliminate lymphatic filariasis and to control onchocerciasis by
produced from blackflies fed on cattle in Cameroon. Motile male O. mass drug administration (MDA) in West and Central Africa have been
ochengi were isolated following culture of disrupted onchocercomas, prior hampered by the risk of severe adverse reactions among persons harboring
to surgical implantation into the peritoneal cavity of SCID mice. Viable high-level loiasis infections (>8,000 microfilariae per mL of blood). A
macrofilariae were recovered in 100% of recipients assessed between test-and-NOT-treat strategy has been proposed for excluding persons
1-5 weeks post implant (mean survival=49.22% ±5.08, n=22). Therefore, with high-level loiasis from MDA. This will require low-resource, real-
the implant model was assessed for suitability to test for efficacy of direct time, point-of-care diagnostics that can be used at the time of MDA to
anti-nematodicidal drugs using the standard macrofilaricide, flubendazole identify persons with high-level loiasis and exclude them from treatment.
suspension (FBZ). FBZ or vehicle control (VC) was administered parenterally Using Caenorhabditis elegans L1 larvae as surrogates for microfilariae,
(10mg/kg sc, +5 days) into groups of SCID recipients (n=7-8) of 15 male we have developed a low-resource laser diffraction assay for microfilarial
O. ochengi. FBZ induced an almost total macrofilaricidal response assessed quantification. The prototype apparatus is composed of a low-power
4-5 weeks after implant (mean survival FBZ=1.67%±1.09 vs VC=43.81% red laser (similar to a laser pointer) directed through a sample chamber
±11.44, p=0.0089). O. ochengi L3 larvae were also inoculated into SCID (cuvette, flow cell, or capillary tube) towards a photodiode connected to a
mice. However, only 1 viable larva could be recovered after 7-14 days laptop-powered oscilloscope. Preliminary studies show the assay is capable
following sc or ip injection of between 40-100 L3 (n=26). In conclusion, of quantifying worm concentrations between 500 and 50,000 L1 larvae/
we have developed a small animal model of onchocerciasis using adult mL. Assay sensitivity is dependent on depth of the sample chamber: a 1
O. ochengi parasites that is sufficiently robust to commence screening cm chamber depth gives maximum sensitivity while a 0.05 cm depth gives
of macrofilaricidal candidates. We are currently validating this model lower sensitivity but greater precision. Cellular blood components interfere
for additional screening of anti-Wolbachia candidates. Further, we have with the diffraction assay, and low-resource methods to separate larvae
commenced development of a murine onchocercoma xenograft model to from blood components prior to quantification are being developed. These
evaluate whether male and female macrofilariae and released microfilariae preliminary data suggest that a portable, battery-powered, low cost laser-
can survive in SCID recipients for periods necessary to further validate diffraction device may be capable of rapid, point-of-care quantification of
efficacy of macrofilaricidal drugs. microfilarial burden in the setting of MDA.
504 506
TREATMENT Dunia Faulx1, Allison Golden1, Melissa Valdez1, Roger Peck1,
Ghaith Aljayyoussi, Louise Ford, Raman Sharma, Joseph Turner, Eric Stevens1, Lindsay Yokobe1, Pooja Bansil1, Potochoziou K.
Mark Taylor, Stephen Ward Karabou2, Meba Banla3, Kangni Adade2, Richard Gbandi Gantin3,
Peter Soboslay4, Thomas B. Nutman5, Gonzalo J. Domingo1, Tala
Liverpool School of Tropical Medicine, Liverpool, United Kingdom
de los Santos1
Here we show for the first time a user friendly, interactive, internet 1
PATH, Seattle, WA, United States, 2National Onchocerciasis Control
based computer simulation that will help in the prediction of mass drug
Programme, Lome, Togo, 3Onchocerciasis Research Laboratories, Sokode,
administration outcomes in onchocerciasis treatment and control. The
Togo, 4University of Tubingen, Tubingen, Germany, 5National Institute of
model is being developed within the A∙WOL consortium, to predict the
Health, Bethesda, MD, United States
impact of anti- Wolbachia drugs currently being advanced. The simulation
program focuses on how different treatments, such as microfilaricidal, The progress that has been made toward the elimination of onchocerciasis,
macrofilaricidal or combinations, would reflect upon the overall outcome or river blindness, in the Americas and Africa has been the culmination
of treatment regimes in a specific endemic area. We utilise dynamic of decades of commendable dedication to controlling this disease. Over
models using to form an interactive platform where the user can the past few years, the use of annual or semi-annual community-based
experiment with different scenarios with complete control over parameters ivermectin distribution through mass drug administration (MDA) programs
such as degree of endemicity, drug modes of action, drug pharmacokinetic has moved the goal from control to elimination. As elimination goals
profiles, vector biting rates and the application of vector control and drug are being reached, appropriate diagnostic tools are needed to identify
resistance. The model also puts into consideration population variations exposure to Onchocerca volvulus (Ov) for purposes of identifying possible
in response to the drug which aids in predicting worst case scenarios and recrudescence. A rapid diagnostic test (RDT) that detects IgG4 antibodies
specific to the antigen Ov16 has been developed and will be manufactured 508
by Standard Diagnostics, Inc. Prior to commercial availability, the test has
been evaluated in the PATH laboratory and in rural settings in Togo with EPIDEMIOLOGY OF SOIL TRANSMITTED HELMINTHS AND
1,500 participants during routine Ov epidemiological surveillance activities. PLASMODIUM FALCIPARUM AMONG SCHOOL CHILDREN IN
In the laboratory setting, our data indicate that the RDT has a sensitivity BUMULA DISTRICT, WESTERN KENYA
of 89% and a specificity of 99%, when compared to an Ov16-specific
ELISA. The read window, an important indicator of test result stability, Stella Kepha1, Birgit Nikolay2, Rachel L. Pullan2, Charles S.
is highly consistent over a 24-hour time period. We will also present the Mwandawiro3, Sammy M. Njenga3, Fred Nuwaha1, Simon J.
performance of the RDT relative to the Ov16 ELISA and sensitivity as Brooker2
compared to skin-snip derived microfilaria status when tested in real-world 1
Makerere University, Kampala, Uganda, 2London School of Hygiene &
settings in Togo that include factors such as exposure to high temperature Tropical Medicine, London, United Kingdom, 3Kenya Medical Research
and humidity. Finally, we describe possible facilitators and barriers for Institute, Nairobi, Kenya
integration of the test into routine surveillance practices. Our data verify Soil-transmitted helminthiasis and malaria continue to be important health
the performance of the test in field settings prior to a commercial launch problems among Kenyan school children, many of whom are at risk of
of the Ov16-based RDT and informs how it should be used in current coinfection. It has been suggested that the immune response evoked
onchocerciasis control and elimination efforts. by helminth infections may modify immune responses to plasmodia
species and consequently alter risk of infection; however previous
507 studies have been inconclusive. As part of baseline activities of a current
trial investigating deworming impact on risk of clinical malaria among
SURVIVOR COPYCAT BEHAVIORS AND AUTOCHTHONOUS school children in Bumula District in western Kenya (ClinicalTrials.gov:
HELMINTHIASES IN THE U.S. NCT01658774), a cross-sectional survey was conducted to investigate
James H. Diaz the prevalence, intensity and geographic distribution of soil-transmitted
helminth (STH) and Plasmodium falciparum infections among 4,842
Louisiana State University Health Sciences Center, New Orleans, LA, United
school aged children in purposively selected 22 primary schools.
Single stool samples were collected and examined in duplicate for STH
Popular Survivor TV programs glamorize rugged outdoorsmen surviving (hookworm, Ascaris lumbridoides and Trichuris trichiura) using the Kato
wilderness adventures by seeking natural sustenance. To identify Katz method. A finger-prick blood sample was taken and examined for
risk factors for autochthonous helminthiases resulting from Survivor P. falciparum by expert microscopy. Overall, 23.4% of the children were
copycat behaviors, Internet searches identified 54 cases of helminthiases infected with P. falciparum and 26.5% with one or more STH species,
transmitted by the raw consumption of animals recommended as with hookworm (16.4%) and A. lumbricoides (14.3%). The prevalence
safe, natural foods by Survivor series programming during the period, of STH and P. falciparum infections varied significantly by age group
1984-2013. Cases were defined by positive microscopic, serologic, or and sex and by geographical location. After adjusting for age, sex and
molecular diagnostics. Continuous variables were analyzed for significant clustering within schools, the risk of P. falciparum infection was higher
differences by unpaired t-tests; categorical variables were analyzed by among children with any STH infection (odds ratios= 1.2, 95% confidence
chi squares. Statistical significance was indicated by p-values ≤0.05. 38 intervals [CI] (1-1.4), p=0.03), although there was no significant
autochthonous cases of neuroangiostrongyloidiasis (NAS) with eosinophilic association between P. falciparum and individual STH species. Interestingly
meningoencephalitis and 16 cases of autochthonous paragonimiasis (PG) however, P. falciparum infection was positively associated with medium to
with hemorrhagic pneumonitis were reported following consumption of high intensity A. lumbricoides infections (odds ratios= 1.5, 95% CI (1.1-
raw intermediate hosts infected by causative parasites, the rat lungworm 2.1), p=0.006). Coinfection with P. falciparum and STH is common among
(Angiostrongylus cantonensis) and the American lung fluke (Paragonimus school children in western Kenya, supporting the need for integrated
kellicotti) respectively. The mean age of NAS cases was 21.5 years; most helminth and malaria control. There is also a need to investigate the
cases were in males (P = 0.039) from Hawaii (P = 0.039), 37% of whom consequences of deworming on the risk of malaria.
reported consuming raw snails or frogs or eating unwashed greens
harboring infective larval snails (P = 0.003). The mean age of the PG 509
patients was 27.3 years; most cases (93%) were reported in males (P <
0.0001) from Missouri, most of whom (67%) had consumed raw crayfish PHYTOCHEMICAL, EFFICACY AND SAFETY PROFILES OF
(P < 0.0001), often while intoxicated (47%) on camping, paddling, EMBELIA SCHIMPERI VATKE
or floating trips within the Mississippi River Drainage Basin (73%, P =
0.028). There was one death in a 71-year-old male with PG. The most Mesfin Tefera1, Dawit Abebe1, Asfaw Debella1, Walelingn
significant risk factors for autochthonous helminthiases from Survivor Mekonennen1, Ibrahim Naser2, Enadale Seifu3, Asrat Dawit4,
copycat behaviors included male gender; and consumption of raw, wild Berhanu Tesfaye1, Samuel W/Kidan1
animals in parasite-endemic regions, especially while intoxicated outdoors. Ethiopian Public Health Institute, Addis Ababa, Ethiopia, 2National Taiwan
Recommended preventive-behavior interventions included proper food University of Science and Technology, Taipei, Taiwan, 3Addis Ababa
preparation of self-harvested wild animals, wilderness survival training, and University, School of Pharmacy, Addis Ababa, Ethiopia, 4Addis Ababa
alcohol avoidance during outdoor recreation. University, Medical Faculty, Addis Ababa, Ethiopia
Embelia schimperi fruits are among the most common traditionally used
agents to teat parasitic / helminthes infections in Ethiopia. Despite the
plants widespread use, scientific evidence on constituents responsible
for the biological activity, efficacy and safety is not well documented.
A 96 well micro titer pale assay technique was used to evaluate the in
vitro anthelmintic properties of crude hydro alcoholic extract and solvent
fractions of E. schimperi fruits against hookworm and strongyloides spp.
The in vivo anthelmintic activity of the extract was determined in albino
mice experimentally infested with Hymenolopis nana worms. The percent
killing activity of the crude extract was from 92-100% when tested
at a concentration of range of 50-400mg/ml against hook worm and
Strongylodes spp. The percent motility inhibition against hookworm larvae
was from 66.6-86.6% when fractions were tested at a concentration of
50mg/ml. 100% adult parasite clearance was observed from the mice 511
intestine when the crude extract was administered at a single oral dose
of 1kg/kg. Phytochemical screening indicated the presence of steroids, MOLECULAR DIAGNOSIS OF SOIL-TRANSMITTED HELMINTH
polyphenols, quinone and alkaloids. Preliminary sub chronic toxicity INFECTIONS USING A NOVEL ISOTHERMAL AMPLIFICATION
study was also conducted to make gross observation on measurements METHOD
of change in body weight, hematological, biochemical parameters and
histopathology of kidney and liver of albino mice. The toxicity study Nour Rashwan, Catherine Bourguinat, Roger Prichard
indicated that the crude extract of E. schimperi fruit has wide safety McGill University, Montreal, QC, Canada
margin in all tested parameters and the plant may be relatively safe as an Ascariasis, Trichuriasis, and Hookworms are the three main soil-transmitted
oral anthelmintic medication if further investigations is carried out. This helminth infections, causing human morbidity in tropical areas of the
study also indicates the presence of active principles in E. schimperi fruits world. Diagnosis of human soil-transmitted helminths (STHs) relies on
with anthelmintic activity that may support the usage of preparations from microscopy to identify eggs in the feces. The precise detection of STHs by
the plant by local people to treat parasite helminthes infection. In this microscopy requires training and is labor intensive and can lead to false
study average worm expulsion tine and possible mechanism of action of negative results. As a result of the limitations of microscopic methods, it
the extract is also suggested. However, further research is required to study was of interest to develop new methods to identify different STH species.
long term toxicity, effect on beneficial micro biota, mechanism of action, Accurate diagnostic is not only essential for epidemiological studies but
identification of marker compounds and effectiveness of the plat in vivo / is vital for monitoring the possible emergence of drug resistance and for
human model/ and clinical trails before it can be recommended for human the development of new anthelmintics since the efficacy of different drugs
use. shows variation among the species. For a variety of infections, studies have
shown that molecular diagnostic tools can be more reliable and sensitive.
510 Therefore, development of a simple, rapid and sensitive molecular tool
for STH species diagnosis is desirable. We developed novel diagnostic
THE EFFICACY OF ALBENDAZOLE AND LEVAMISOLE DRUG assays based on the Smart Amplification method (SmartAmp) to detect
COMBINATION IN INDIVIDUALS WITH REDUCED EFFICACY STH infections under isothermal condition. This isothermal method uses
FOR SINGLE-DOSE ALBENDAZOLE TREATMENT AGAINST asymmetric primer design to prevent non specific amplification. Control
HOOKWORM INFECTIONS plasmids were employed to develop and optimize the assays. The assays
were applied to analyze fecal samples using species-specific primer sets.
Buhari B. Hamidu1, Edward J. Tettevi2, John A. Larbi1, Mike Y.
Real-time PCR monitoring of the amplification was achieved within 20-
40 min with complete suppression of the background amplification.
Kwame Nkrumah University of Science and Technology, Kumasi, Ghana,
SMartAmp assays were developed for diagnosis of STH infections and
Council for Scientific and Industrial Research - Water Research Institute,
the reliability of the method was validated using the conventional PCR
Accra, Ghana method.
The Soil-Transmitted Helminth (STH) infections control programme has
been on-going in Ghana since 2000 with mass drug administration (MDA) 512
of albendazole (ALB) to school children. However, our research revealed,
100% cure rate with albendazole-levamisole (ALB-LEV) combination in IDENTIFICATION AND CHARACTERIZATION OF THE
hookworm population responding sub-optimally to ALB treatment in IMMUNOMODULATORY MOLECULE(S) IN EXCRETORY-
four endemic communities in the Northern region of Ghana. This was SECRETORY (ES) PRODUCTS DERIVED FROM THE
an eighteen months longitudinal study. A total of 421 school children GASTROINTESTINAL NEMATODE HELIGMOSOMOIDES
between the ages of 2-17 years were randomly selected from four POLYGYRUS
endemic communities in Kpandae district of the Northern region of
Ghana. One hundred and three (103) patients positive for hookworm Rajesh M. Valanparambil1, Mifong Tam1, Yovany Moreno2,
were categorised into four groups: Control, ALB only, LEV only and LEV Armando Jardim2, Timothy G. Geary2, Mary M. Stevenson1
- ALB drug combinations with 26 patients in each group. Coprological 1
The Research Institute of McGill University Health Centre, Montreal, QC,
assessment for parasites was based on the Kato-Katz technique. Parasites Canada, 2Institute of Parasitology, McGill University, Montreal, QC, Canada
recorded were hookworm (Ancylostoma doudenale and Necator Heligmosomoides polygyrus (Hp) is a murine gastrointestinal (GI)
americanus), Trichuris trichiura, Hymenolepis nana, and Taenia sp. in the nematode used as a model of helminth parasites that infect humans
communities selected. Overall, the highest cure rate after 21 days of and livestock. We previously showed that Hp-derived excretory-secretory
treatment was recorded for LEV-ALB treatment (100%) followed by LEV products (HES) potently suppress effector CD4+ Th cell responses to an
alone (92.31%) and ALB alone (88.46) whiles the Control was zero. Also, unrelated antigen by modulating the antigen presenting function of
faecal egg count reduction rate was 100% (LEV-ALB), 96.15% (LEV alone), dendritic cells (DC) to induce an anti-inflammatory network involving
91.84 (ALB alone) and 9% for Control.Cumulative re-infection rates were regulatory T cells. Interrogation of mass spectrometry (MS) data from
12, 32 and 48% and 23, 50 and 69% respectively for LEV-ALB, LEV alone 1D-SDS PAGE and LC-MS/MS analysis of HES with transcriptomic
and ALB alone at 6 months and one year after treatments. Hookworm information indicated that HES contains over 200 proteins, including
still remains a significant public health burden in Africa. The result shows several with known immunomodulatory effects. To better define the
a significant efficacy for LEV - ALB combination in hookworm population immunomodulatory molecules(s) in HES, we used biochemical approaches
with reduced ALB treatment (100% FEC) after 21days treatment and and assessed the suppressive activity of the separated fractions by
therefore can be used to augment ALB for clearing possible resistant measuring IL-12p70 secretion by bone marrow-derived DC (BMDC)
parasites of hookworm infections. All parasitic samples are currently being pre-treated with HES fractions prior to stimulation with the TLR9 ligand
analysed to identify polymorphism related to benzimidazole resistance in CpG-ODN. First, we performed size exclusion chromatography to separate
hookworms. HES proteins based on their molecular weight and identified 12 fractions
that suppressed DC secretion of IL-12p70 in response to CpG-ODN. The
suppressive fractions were pooled and subjected to further separation
by anion-exchange chromatography followed by testing on CpG-ODN-
stimulated BMDC. We identified 3 fractions that suppressed IL-12p70
secretion. Analysis of these fractions by LC-MS/MS identified 21 candidate
proteins. To further narrow down the immunomodulatory candidate(s),
HES was resolved by cation-exchange chromatography. Only one fraction
was identified to have suppressive activity in the BMDC assay; LC-MS/MS 514
analysis is underway to identify the proteins in this fraction. Our goal is to
clone and purify the candidate immunosuppressive protein(s) and to test THE IMPACT OF COMMUNITY DEWORMING AGAINST SOIL
the ability of recombinant protein to modulate DC polarization of effector TRANSMITTED HELMINTHIASES ON PREVALENCE, WORM
CD4+ T cell responses in vitro and in vivo. Together, our findings provide BURDEN AND MORBIDITY IN A HIGH PREVALENCE AREA OF
novel information on biochemical and immunomodulatory aspects of GI ARGENTINEAN GRAN CHACO
nematode-derived ES products.
Adriana Echazu1, Paola Vargas1, Marisa Juarez1, Pamela Cajal1,
513 Ruben Cimino1, Diego Cruz2, Roxana Ruiz2, Viviana Heredia3,
Gladys Paredes3, Luis M. Arias4, Alejandro J. Krolewiecki5
Instituto de Investigaciones en Enfermedades Tropicales - Universidad
MATRIX METALLOPROTEINASE 2, 9 AND TH2 CYTOKINES Nacional de Salta, Salta, Argentina, 2Fundación Mundo Sano, Buenos
IN MICE WITH EOSINOPHILIC MENINGITIS CAUSED BY Aires, Argentina, 3Hospital J.D. Perón, Tartagal, Salta, Argentina,
Ministerio de Salud Pública de la Provincia de Salta, Salta, Argentina,
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET),
Hung-Chin Tsai, Yu-Shin Chen, I-Tzu Chen, Pei-Yun Chou, Susan Buenos Aires, Argentina
Shin-Jung Lee, Yao-Shen Chen
Soil-transmitted helminthiases (STH) are the most prevalent infections of
Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan human-kind, relevant to public health due its morbidity and role in poverty
Angiostrongylus cantonensis, also known as the rat lungworm, is the perpetuation. Tartagal, Gran-Chaco, Argentina is a high prevalence area
major cause of eosinophilic meningitis in the Pacific Islands and Southeast where no preventive anthelminthic chemotherapy was recently applied.
Asia. Rats serve as the definitive host of the nematode. Humans are This study, conducted in Tartagal since March 2012, investigates the
infected incidentally and lead to eosinophilic meningitis. Previous BALB/c results of community-based mass drug administration (MDA) and lasting
animal study had demonstrated increased matrix metalloproteinase 9 until 2015. Population: ~3600 individuals. Surveillance of a statistically
(MMP-9) expressions and blood brain barrier damage in mice infected representative random group, with fresh stool sample analysis, complete
with A. cantonensis. Steroids have been shown to be one of the effective blood count and detection of IgG against S.stercoralis with NIE-ELISA.
treatment options for eosinophilic meningitis caused by A. cantonensis Treatment intervention: single dose albendazole + ivermectin. Survey:
infection. However, the mechanism of how steroids can influence on n=157 stool; n=149 blood for baseline and n=103 stool; n=152 blood
eosinophilic meningitis are still unclear. We hypothesize that the beneficial 6 months later. Baseline prevalences for any STH at baseline and follow-
effect of steroid on eosinophilic meningitis are mediated by decrease up were 55 and 16% respectively; and for hookworm (HKW) 50 and
MMP and cytokines expressions. In a BALB/c mice model, mice were 13% respectively (p<0.05). HKWs main species was A.duodenale (85%).
orally infected with 40 A. cantonensis L3 via an orogastric tube and were Baseline S.stercoralis prevalence was 13% and at follow-up 8% (p=0.22).
sacrificed every week for 3 consecutive weeks after infection until the T.trichiura and A.lumbricoides were rarely found. Worm burden revealed
end of the study. Dexamethasone was injected via the intra-peritoneal 3 heavy HKW infections at baseline and none at follow up. At baseline
routine from 7th days of infection until the end of the study. Evans blue 56% of the individuals were anemic, mean Hgb value 11 gr/dL (SD=1.6;
method was used to measure the blood brain barrier changes and the minimum 4.9) which improved to 10% anemic (all young women),
serum/CSF and brain homogenates expression of MMP-2, 9 and cytokines mean Hgb value 13 gr/dL (SD=1.5; minimum 9) at follow up (p<0.05).
were analyzed by gelatin zymography, western blot, ELISA and reverse HKW infection was significantly associated with anemia (p=0.001), risk
transcriptase polymerase chain reaction (RT-PCR) respectively. There ratio (RR)=1.54 (CI 95% 1.03-2.30) at baseline, however at follow up
were an increased MMP-2 and MMP-9 expressions in CSF and brain it was no longer significant (p=0.58). 75% had eosinophilia at baseline
homogenates by western blot and gelatin zymography following 2-3 and 43% after MDA (p<0.05). No significant difference in S.stercoralis
weeks of infection. Dexamethasone administration could down-regulate seroprevalence was found between baseline (51%) and follow up (44%)
the expression of MMPs. These changes were parallel to the blood brain (p=0.25). MDA coverage: 80%. One round of community-based MDA
barrier disruption as evidence by the Evans blue extravasation following was effective in reducing the prevalences of STH infection, anemia and
infections. Furthermore, the brain homogenates cytokines , such as IL- eosinophilia and in decreasing anemia severity and HKW infection burden.
5, IL-10 and INF-γwere also elevated following 2-3 weeks of infection. Individuals who remained anemic after MDA were women of reproductive
Dexamethasone could decrease the expression of IL-5, IL-6, IL-10 and TNF- age, with other probable causes of anemia.
αby using ELISA. The brain homogenates mRNA expressions of IL-5, IL-6,
INF-γ and TNF-α were decreased gradually by RT-PCR. All of these findings 515
suggested that the Th2 cytokines play an important role in mice with
eosinophilic meningitis caused by A. cantonensis infection and provided PLANT NATURAL PRODUCTS SHOW EX VIVO ACTIVITY
the evidences supporting steroid effects on A. cantonensis infection by AGAINST ADULT HOOKWORM
inhibiting MMP-2, 9 and Th2 inflammatory cytokines expressions.
Blaise Dondji1, Kaitlin L. Koppinger1, Averyl Shindruk1, Brianda
Cardenas-Vegas1, Jocelyn McCornack1, Susmita Unni1, Gil
Belofsky2, William Ray2, Eric Winterstein2
Laboratory of Cellular Immunology and Parasitology, Department of
Biological Sciences, Central Washington University, Ellensburg, WA,
United States, 2Department of Chemistry, Central Washington University,
Ellensburg, WA, United States
Hookworms, blood feeding intestinal parasites, remain a major health
burden with approximately a billion people infected in tropical and
subtropical regions of the world. In these geographical areas, they are a
major contributor to iron-deficiency anemia, weight loss, stunted growth
and malnutrition. Control strategies have relied on mass treatment
with benzimidazole drugs. However, recent reports have described the
resistance of hookworms and other soil-transmitted nematodes to these
drugs. Considering that in several endemic areas, local populations use
plant products to treat several ailments including parasitic diseases, we
tested compounds from plants for their anthelminthic activity against the 517
adult stage of the hookworm, Ancylostoma ceylanicum. The present study
screened extracts from five plant species and chromatographically-enriched TOXOCARIASIS IN NORTH AMERICA: A SYSTEMATIC REVIEW
fractions of the most active one. These plants were collected from the
western United States. Extracts from two of the plants namely Dalea Rachel M. Lee1, Laura B. Moore2, Maria Elena Bottazzi3, Peter J.
ornata and Oemlaria cerasiformis showed anthelminthic activity (mortality Hotez3
and/or reduced motility) of their crude extracts and enriched fractions
Baylor College of Medicine, Houston, TX, United States, 2James A. Baker
against A. ceylanicum. Associated worm mortality rates ranged from 25% Institute of Public Policy, Rice University, Houston, TX, United States,
at 24 hours to 100% at 120 hours, after incubating worms with the test
National School of Tropical Medicine, Baylor College of Medicine,
compounds. Three concentrations of the compounds were tested (100, Houston, TX, United States
50, 10 mg/mL). Our study revealed a dose-dependent activity where the Toxocariasis is an important neglected tropical disease that can manifest
lowest concentration (10 mg/mL) achieved 100% mortality 120 hours post as visceral or ocular larva migrans, or covert toxocariasis. All three forms
exposure while the same activity level was obtained at 48 hours with 100 pose a significant public health problem in areas of high prevalence. To
mg/mL. Our data show that plants represent a relatively untapped source determine the burden of toxocariasis in North America we conducted a
of potentially effective anthelminthic molecules. Studies are underway systematic review of the literature following PRISMA guidelines. We found
with the aim of purifying and testing active components of the extracts 18 articles with original prevalence, incidence, or case data for toxocariasis.
ex vivo and in vivo. The anthelminthic activity of these compounds in the Of these articles, 5 reported data for Canada, 8 reported data for the
animal model of the disease will be evaluated using clinical, parasitological United States, and 5 reported data for Mexico. One article reported only
and immunological parameters such as weight gain, anemia, egg output, prevalence data, no articles reported incidence data, 5 articles reported
worm burden, immune cell proliferation indices, and immune cell only affected cases, and 12 articles reported both prevalence data and
population types and sizes by flow cytometry. number of affected cases. 63% of articles with seroprevalence estimates
for the United States tested blood samples collected during the 1988-1994
516 National Health and Nutrition Examination Survey. The most commonly
cited risk factors for toxocariasis included male sex, pet ownership,
CYTOKINE EXPRESSION PROFILES AND IMMUNITY TO particularly if the animals are allowed to live outdoors and eat other
MEASLES VACCINATION IN KENYAN CHILDREN WITH animals or otherwise consume unconventional pet food, African American
HELMINTH INFECTION race, age less than 18, low level of education, poverty, foreign birth, living
in the southern United States, and playing at parks or in sandboxes where
Joshua R. Lacsina1, Jacqueline M. Naulikha2, Patricia Pavlinac1, dogs and cats have defecated. Of the studies that reported prevalence
Doreen Rwigi2, Alfred Odiwuor2, Frankline M. Onchiri1, Loice W. data by sex 73% found a statistically significant greater prevalence in
Mbogo2, Benson O. Singa2, Judd L. Walson1 males compared to females, while 27% of studies found no significant
University of Washington, Seattle, WA, United States, 2Kenya Medical differences between genders. No studies found females to have
Research Institute, Nairobi, Kenya significantly higher prevalence of Toxocara infection than males. Further
Helminths are among the most prevalent infections in resource-limited research is needed to determine the true current burden of toxocariasis in
countries, with an estimated one billion school-age children worldwide North America, however the prevalence estimates gathered in this review
living in areas at high risk for helminth transmission. Children are suggest that the burden of disease is significant.
particularly susceptible to high-burden infections, which can result in
derangements in host cytokine expression. These derangements, in turn, 518
lead to both immunosuppression and pathologic inflammation in the host.
The disruption of cytokine signaling by helminths has been proposed to THE ROLE OF SOIL-TRANSMITTED HELMINTH INTENSITY
impair the ability of children to mount protective immune responses to AND CO-INFECTION IN THE SPATIOTEMPORAL VARIATION
vaccination. We are currently enrolling children in a cross-sectional study OF CHILDHOOD ANEMIA: RESULTS OF A 5-YEAR MDA
to test the hypothesis that helminth infection is associated with a modified PROGRAM IN BURUNDI
Th2 cytokine response, which is permissive for chronic helminth infection
and reflected by an elevated IgG4/IgE ratio. Furthermore, we will explicitly Mohamad Assoum1, Giuseppina Ortu2, Maria Gloria Basanez2,
test the prediction that helminth infection is associated with impaired Archie Clements3, Ricardo Soares Magalhaes1
vaccine-induced immune responses, specifically for measles vaccination. 1
The University of Queensland, Herston, Australia, 2Imperial College
This study is nested within a large pediatric surveillance cohort at three London, Norfolk Place, United Kingdom, 3Australian National University,
clinical sites in Western Kenya. Plasma and stool samples are collected at Canberra, Australia
the time of enrollment from eligible children aged 1 through 5 years with We investigated the role of Ascaris lumbricoides, Trichuris trichiura and
documented measles vaccination. Shortly after collection, stool samples hookworm infection and coinfections in the anaemia burden in school age
are tested by Kato-Katz and formol-ether concentration methods to children as a result of a 5-year mass drug administration (MDA) program
diagnose helminth infection and quantify parasite burden. Plasma from in Burundi. The aim of the study was to investigate for the first time the
children with and without helminth infection will be analyzed by ELISA to impact of the MDA program on the spatiotemporal variation in anaemia
compare serum levels of Th1 and Th2 cytokines, as well as titers of IgE, burden in the country. Longitudinal parasitological data was collected from
IgG4, and anti-measles antibodies. Preliminary enrollment demonstrates a 40,553 children from 2007 to 2011 in 31 schools in Burundi. These data
helminth infection prevalence of approximately 25% in our Western Kenya included faecal egg counts for A. lumbricoides, T. trichiura and hookworm,
cohort. Improving our understanding of helminth-mediated immune coinfections with these parasites and blood iron levels, age, sex, weight
dysfunction will facilitate the rational design of both anti-helminth and height. Locational data included the GPS coordinates of the schools,
vaccines and novel adjuvants to enhance vaccine efficacy in helminth- annual mean land surface temperature, NDVI, precipitation and the
endemic areas. distance to perennial water bodies. Spatiotemporal Bayesian geostatistical
models of anaemia were built adjusting for age, sex, helminth intensity
and co-infections, malnutrition and physical environment factors
associated with the geographical location of the school. Our results
indicate that the geographical distribution of the prevalence of anaemia
did not change significantly during the 5-years. Our results indicate an
association between the spatiotemporal variation in anaemia burden in
children in Burundi and STH intensity and co-infections and environmental
conditions. Our study demonstrates the important role of malnutrition combined. Although we have published combination studies using the
in anaemia burden over the five year period. The findings of this study nematode Caenorhabditis elegans, it was not clear how these translate
suggest that MDA has played an important role in the control of anaemia in vivo in infected mammals. Surprisingly, little work has been done to
in school age-children in Burundi. The results also suggest the need to define the characteristics of anthelmintic combinations in vivo. By using
integrate nutritional interventions to the current MDA programme to the hookworm (Ancylostoma ceylanicum) infections in hamster, we
achieve the desired level of anaemia reduction in Burundi. Our maps can establish a new and powerful in vivo paradigm for studying anthelmintics
be useful to guide future MDA campaigns to achieve this reduction. combinations—defining not only how well two drugs combine but also
providing some optimization of the ratio for combinations. Here, we will
519 update you our latest results of the anthelmintic combinations with Cry5B
and other anthelmintics, e.g., tribendimidine. We show that, like in C.
DOMESTIC ANIMALS MECHANICALLY TRANSMIT NECATOR elegans, these two drugs can be combined to give powerful effects in
AMERICANUS HOOKWORM TO HUMANS vivo. Work on other in vivo combinations is also proceeding. Our paradigm
here provides a powerful means on how to examine and demonstrate the
Ryan H. Boyko1, Jeffrey P. Townsend1, Debbie Humphries1, David anthelmintic combination therapies.
P. Durham1, Dickson Osabutey2, Yvonne A. Ashong2, Lisa M.
Harrison3, Joseph Otchere2, Michael Wilson2, Michael Cappello3,
Alison P. Galvani1 521
School of Public Health, New Haven, CT, United States, 2Noguchi THE ROLE OF SOIL-TRANSMITTED HELMINTH INFECTIONS
Memorial Institute for Medical Research, Accra, Ghana, 3Ghana-Yale IN THE GEOGRAPHIC RISK OF FUNCTIONAL ILLITERACY
Partnership for Global Health, New Haven, CT, United States OF SCHOOL-AGED CHILDREN IN THE PHILIPPINES: SPATIAL
Necator americanus hookworm infections cause serious impairment in VARIATION AND NUMBERS AT RISK
millions of children across the tropics. While humans are the only definitive
host of Necator americanus, epidemiological evidence from South Kei Owada1, Maria Sonia Salamat2, Lydia Leonardo2, Archie
America, Africa, and Asia suggest that risk for hookworm infection is Clements3, Laith Yakob1, Colleen Lau1, Ricardo Soares Magalhaes1
increased by contact with dogs and pigs. Building on experiments showing 1
University of Queensland, Herston, Australia, 2University of the
that N. americanus eggs can survive passage in the pig digestive tract, we Philippines, Manila, Philippines, 3Australian National University, Canberra,
demonstrate that pigs and dogs in twelve rural communities in central Australia
Ghana harbor and excrete viable human hookworm eggs in their stool. We aimed to understand the contribution that soil-transmitted helminth
Using logistic and ordinal regressions, we show that pig ownership and (STH) infections make to functional literacy status of school-aged children
the proportion of households owning dogs in one's village significantly in the Philippines and investigated, for the first time, the geographical
predicted hookworm prevalence and infection intensity. In these distribution of prevalence of functional literacy indicators adjusting for
communities, 67% of dog feces and 55% of pig feces contain hookworm STH infections. STH infection data were collected from 29,919 individuals
eggs. Using PCR, we confirmed a majority of collected animal stools during the most recent National Schistosomiasis Survey conducted in
contained N. americanus. Further, infective third stage hookworm larvae 2005 to 2007 in 177 locations throughout the Philippines. Data were
developed from all of the samples (n=41), demonstrating egg viability also provided by the National Statistics Office on three functional literacy
after natural passage through an animal's digestive tract. The presence indicators (i.e. ability to compute, read and comprehend) of 19,673
of high rates of antibodies to Toxocara canis in their serum suggests school-aged children in the Philippines. Our study was conducted in two
humans in these communities are frequently exposed to helminth parasites phases: first, Bayesian geostatistical models were developed to predict
through contact with dogs. We introduce a new hookworm transmission the complete geographical distribution of Ascaris lumbricoides, Trichuris
model that indicates that animal-mediated transmission of hookworm trichiura and hookworm co-infection and intensity of infection across the
eggs may play an important role in human disease. Hookworm control Filipino population. Second, Bayesian geostatistical models were built for
strategies embracing the 'One Health' concept by interrupting hookworm each of the functional literacy indicators, adjusting for the location and
transmission from animals should be developed. the predicted co-infection and intensity of A. lumbricoides, T. trichiura and
hookworm generated during the first phase. Our results indicate that A.
520 lumbricoides and T .trichiura co-infection is an important contributor to
the spatial variation of functional illiteracy of school-aged children. We
A PARADIGM FOR STUDYING ANTHELMINTIC identified significant spatial heterogeneity in functional literacy indicators
COMBINATIONS IN VIVO between regions of the Philippines and remarkable spatial variation in
functional literacy indicators within different regions of the Philippines
Melanie M. Miller1, Yan Hu2, Thanh-Thanh H. Nguyen2, Christina
accounted by STH co-infection and intensity of infection. Our results
Gee1, James D. Lui1, Raffi V. Aroian2
demonstrate the important role of STH co-infection and intensity of
University of California San Diego, La Jolla, CA, United States, 2University infection in the geographical variation of prevalence of functional illiteracy
of Massachusetts Medical School, Worcester, MA, United States in the Philippines. The findings of this study can be useful to guide the
Soil-transmitted helminth (STH) nematode parasites (hookworms, Ascaris Integrated Helminth Control Program to improve the health and functional
and Trichuris) are key contributors to morbidity and poverty worldwide. literacy in the Philippines by reducing STH infection levels in school-aged
Few anthelmintics are available for treatment, and only anthelmintic, children.
albendazole, is commonly used in mass drug administrations, even though
there are more than 1 billion people are infected. New anthelmintics
and treatment strategies are greatly needed, in particular as albendazole
resistance is inevitable given its current method of usage and as commonly
occurs with veterinary use of this drug. Our group has identified Cry5B
made by Bacillus thuringiensis as a promising new anthelmintic for treating
STH parasites. Apart from developing Cry5B as a much needed new
class of anthelmintic, we are also interested in preserving the potency
of Cry5B and other anthelmintics as much as possible—i.e., preventing
resistance. To achieve this aim, combination therapies with anthelmintics
is an excellent approach. The challenge with anthelmintic combinations is
defining a good combination and at what ratio drugs can be productively
522 mixed feeding practice. In conclusion, pressure from family/neighbours
to practice mixed feeding should be discouraged. Incorporation of family
SCHISTOSOMIASIS AND SOIL TRANSMITTED HELMINTHS members into programs promoting safer infant feeding options in mothers
IN SCHOOL-AGED CHILDREN: EPIDEMIOLOGICAL PROFILE living with HIV/AIDS and male involvement is imperative. Keywords: infant
IN KINSHASA AND BAS-CONGO PROVINCES OF THE food, HIV, Women, Nigeria
Sylvie Linsuke1, Sabin Sabin1, Kirezi Kanobana2, Faustin
Mukunda3, Raquel Inocêncio da Luz4, Marleen Boelaert2, Jean- EVALUATION OF THE IMPACT OF HIV INFECTION ON THE
Pierre Van Geertruyden4, Katja Polman2, Pascal Lutumba1 DIGESTIVE FLORA OF CHILDREN
Institut National de Recherche Biomédicale, Kinshasa, Democratic
Celine N. Nkenfou1, William B. Abange2, Nelly N. Kamgaing3,
Republic of the Congo, 2Institute of Tropical Medicine, Antwerp, Belgium,
Hortense K. Gonsu3
Programme National de Lutte contre la Bilharziose et Parasitoses
Intestinales, Kinshasa, Democratic Republic of the Congo, 4University of
"Chantal Biya" International Reference Centre for Research on HIV/AIDS
Antwerp, Antwerp, Belgium Prevention and Management, Yaounde, Cameroon, 2Catholic University of
Central Africa, Yaounde, Cameroon, 3Faculty of Medecine and Biomedical
The lack of epidemiological data on schistosomiasis (SCH) and soil-
Sciences, University of Yaounde I, Yaounde, Cameroon
transmitted helminthes (STH) in the Democratic Republic of Congo
(DRC) hampers effective disease control, although these diseases have a The recurrent bacterial infections and affections observed in HIV positive
significant impact on population health. In 2009-2010 we conducted a infants could be explained by the imbalance in their digestive flora. The
random survey in school-aged children (3rd grade) in 11 health areas of study aims at evaluating the impact of HIV infection on the digestive flora
the provinces Kinshasa and Bas-Congo. We collected socio-demographic of infants aged 3-24 months, since there have been no studies addressing
data and examined stool and urine samples of each child. A total of 2399 this issue in Cameroon. A cross-sectional and case-control study was
children (1559 children from Kinshasa and 840 from Bas-Congo) were carried out in two hospitals in Cameroon. Stool sample was collected
included. The overall prevalence of SCH was 13.5 %; CI95%: 12.1-14.8. from each of the proxy-consented HIV positive and HIV negative children.
The highest prevalence of SCH was found in Bas-Congo province (32.1; These stools were cultured using aerobic, strict anaerobic, 10% CO2 and
CI95%: 29-35.3). A total of 61.3 % (CI95%: 59.4-63.3) school-aged microaerophilic conditions. Identification of the bacteria species were
children were infected STH with a predominance of A. lumbricoïdes. This done by biochemical characterization. Out of the 80 children enrolled
prevalence was higher in Kinshasa (64%; CI95%: 61.6-66.4) compared to for the study, 33 (41.25%) were HIV positive children and 47 (58.75%)
Bas-Congo province (56.3%; CI95%: 53.4-60). The data generated in this were HIV negative children. 15 different types of bacteria species were
study provide baseline data for the formulation of control strategies on isolated from HIV positive infants with high presence of Lactobacillus
SCH and STH infections in Kinshasa and Bas-Congo. More work is needed spp. (96.97%) Streptococcus spp. (84.85%) and Bifidobacterium
in other provinces. spp. (81.81%). Opportunistic bacteria like Shigella spp. (24.24%),
Staphylococcus aureus (15.15), Klebsiella spp. (12.12%), Acinetobacter
spp. (3.03%), Pseudomonas spp. (3.03%) and Proteus spp. (3.03%)
523 were also identified. Statistically, Clostridium spp. (p=0.009), Shigella spp.
DETERMINANTS OF INFANT-FEEDING CHOICES OF HIV- (p=0.002), Enterococcus spp. (p=0.000) Staphylococcus aureus (p=006)
POSITIVE WOMEN ATTENDING PREVENTION OF MOTHER- and Streptococcus spp. (0.015) were significantly more present in HIV
TO-CHILD TRANSMISSION CLINICS IN OYO STATE, positive infants than in HIV negative infants. Bacteria species like Proteus
spp. Pseudomonas spp. Acinetobacter spp. Staphylococcus aureus were
isolated only in HIV positive infants and absent in HIV negative children
Aishat B. Usman1, Olufunmilayo Fawole1, Magbagbeola David giving a frequency rate of 24.2%. HIV positive infants at stage 3 and
Dairo2, Saheed Gidado1, Patrick Nguku1 4 harbored more opportunistic bacteria. We remarked the imbalance
Nigeria Field Epidemiology and Laboratory Training Programme, Abuja, in bacteria flora of HIV infected infant's harbouring quantitatively more
Nigeria, 2Department of Epidemiology and Medical Statistics, University of isolated bacteria than in HIV non-infected children. Systematic stool culture
Ibadan, Ibadan, Nigeria would significantly benefit for the follow-up of HIV infected children to
reduce the risk of recurrent bacteria infection.
The Nigerian National HIV Guidelines recommends avoidance of all
breastfeeding when replacement feeding is acceptable, feasible,
affordable, sustainable and safe.This study determined factors influencing 525
the infant-feeding choices of HIV-positive women enrolled in Prevention
of Mother-to-Child Transmission (PMTCT) of HIV clinics in Oyo State,
Nigeria. A cross-sectional survey of 450 HIV-positive women who had
received infant-feeding counselling prior to delivery using a two-stage
sampling technique. A semi-structured questionnaire was administered EXPOSED BUT NOT INFECTED CHILDREN IN MALAWI
to obtain data on socio-demographics, infant feeding choice and factors Nyanyiwe M. Mbeye1, Feiko ter Kuile2, Kamija Phiri1
influencing these choices. We defined mixed feeding as addition of other 1
Malawi College of Medicine, Blantyre, Malawi, 2Liverpool School of
food or water to breast milk in the first six months of life. Four Focus
Tropical Medicine, Liverpool, United Kingdom
Group Discussions (FGD) were conducted. Data was analyzed using Epi-
info software version7.Detailed content analyses of the FGDs were done. Although new HIV infections among adults in sub Saharan Africa have
The mean age of the mothers is 31 ± 3.5years. Exclusive breastfeeding declined by 34% since 2001, the epidemic continues to disproportionately
(EBF), exclusive replacement feeding (ERF) and mixed feeding (MF) were affect this region bearing 70% of all new infections in 2013. However,
62.0%, 25.0%, and 13.0% respectively. Determinants of ERF were mode the sustained scale up of interventions for prevention of mother to child
of delivery (AOR 2.3, 95%CI 0.8-4.3) and the desire to reduce the risk transmission of HIV has led to fewer newly HIV infections in children. The
of transmission (AOR 5.4, 95%CI 2.8-6.4). For EBF, household income World Health Organization recommends that all HIV exposed infants be
(AOR 3.6, 95%CI 1.8-5.4) and health workers influence (AOR 2.5, 95%CI started on cotrimoxazole prophylaxis (CPT) until breastfeeding is stopped
1.2-3.8), while for MF, non-disclosure of HIV status to spouse (AOR= and HIV infection is excluded to provide adequate prevention against early
4.3,95%CI 1.5-12.8), Neighbours' advice ((AOR 1.8,95%CI 1.5-4.7) and opportunistic infections. Adherence may be challenging when CPT is given
infant illnesses (AOR= 2.9, 95%CI2.3-7.8) were the predictors. FGDs to very small infants who need to take it for long periods of time. Previous
revealed pressure from family members as the major determinant of studies have only focused on adherence to PMTCT services hence it is
important to build a grounded theory of the social and cultural influences There is a need to lay strategy on how the preventive measures which
of CPT adherence in this group. Three focus group discussions and are well known by this vulnerable population can actually be effectively
seventeen In depth Interviews were conducted with HIV infected mothers adopted and practiced.
administering daily CPT to their HIV exposed but uninfected infants in a
semi urban district in Malawi. A thorough literature search supplemented 527
the concepts that emerged from the data. Findings We propose a fusion
of the ecological theory of perception and the Health Belief Model to CROSS SECTIONAL ASSESSMENT ON THE PREVALENCE
explain adherence to CPT in this study. The women themselves, their OF HIV AMONG DOTS CLIENTS IN ADDIS ABABA
families, the communities in which they live and the health care system ADMINISTRATIVE REGION 2011-2012
relate and influence each other through social interaction which play a role
in influencing actions either positively or negatively. Motivators such as a Zegeye H. Tessema, A. Mengesha
supportive family help someone to take a positive action and factors such Federal Ministry of Health, Addis Ababa, Ethiopia
as shortage of drugs at the health facility act as deterrents. Interestingly, TB and HIV are the major public health problems in Addis Ababa,
the data in this study demonstrates that despite negative influences that considering this fact; Health institutional based cross-sectional study
might arise at any level, the determination of the individual to take a was undertaken in Addis Ababa administrative region from September
health related action and the realisation that the recommended action 2011 to February 2012. The objective of the study was to determine HIV
will prevent any negative outcomes motivated the mothers to believe sero prevalence among registered tuberculosis patients in Addis Ababa
that they could successfully do something to prevent any negative health public DOTs clinics. The HIV antibody was determined using a single ELSA
outcomes on their children. In conclusion, these findings could be used technique. A total of 417 tuberculosis patients in 26 Dots (intensive care)
to design individualised interventions on HIV disease counselling as well clinics aged 16 years and above was enrolled in the study. The over all
as importance of treatment adherence in infants. The most currently used HIV sero prevalence rate among tuberculosis patients was 32.5%. The
theory of Behavioural Learning lacks this capacity as it ignores effects such highest rate was observed in the age group 30 to 39 years. Almost equal
as past behaviour, habits and lack of acceptance of one's diagnosis. proportions of male 49.3% were found to be HIV sero positive compared
to the females 50.7%. Being unmarried was found to be associated with
526 HIV positive test result (p<0.005). Those divorced and widow/widower
patients had high proportion of HIV positive. Daily labourers and patients
KNOWLEDGE, ATTITUDE AND PRACTICES OF SEXUALLY who are living alone were found to be significantly infected with HIV
TRANSMITTED INFECTIONS AMONG WOMEN OF (p<0,001). The HIV positive rate was higher among pulmonary tuberculosis
REPRODUCTIVE AGE LIVING IN KATANGA SLUM KAMPALA, patients compared to extra-pulmonary tuberculosis cases. Smear positive
UGANDA pulmonary patients 25% were found to be significantly associated with
HIV sero positive test result compared with smear negative pulmonary
Faith Nawagi tuberculosis cases15.6%. It was concluded that HIV infection is highly
Makerere University College of Health Sciences, Department of Nursing, prevalent among smear positive TB, higher schooling, daily labourers,
Kampala, Uganda young age group, unmarried TB- clients, people who had history of STD,
Sexually transmitted infections (STIs) still stand as one of the commonest history of multiple sexual partners. Finally, additional qualitative supportive
health problems affecting women of reproductive age especially in slums. study on KAP on TB patients towards HIV/AIDS is recommended.
These have further been idenified as cofactors of HIV transmission,
multiple complications such as, abortion, infertility and ectopic pregnancy 528
among others.The burden of STIs continues to remain high in Uganda at
69%. In order to design appropriate preventive measures ,there is need MYCOBACTERIUM TUBERCULOSIS-SPECIFIC CD8+T CELL
to establish the profile of knowledge, attitudes and practices of sexually RECALL IN CONVALESCING TB SUBJECTS WITH HIV CO-
transmitted infections among susceptible populations such as women of INFECTION
reproducitive age living in slums like Katanga in Kampala Uganda.This
was a descriptive crosssectional study with 339 participants.A consecutive
Violet Asiko Ongaya1, Matthew B. Huante2, Paul W. Mwangi1,
sampling method was done. Using a standardized questionnaire, woman
Philip H. H. Keiser2, Evans I. Amukoye1, Janice J. Endsley2
in Katanga slum who met the eligibility criteria were interviewed and data Kenya Medical Research Institute, Nairobi, Kenya, 2University of Texas
collected from them. Data was coded, cleaned, transcribed and double Medical Branch, Galveston, TX, United States
entered using EPI-data 3.1 and analyzed using SPSS 17.0. Coded data Memory T cell populations recover following phase I chemotherapy for
was summarized using frequencies for categorical data and medians for tuberculosis (TB) and augment the effectiveness of antibiotics during the
continuous data.In this study76.7% knew what STIs are with 41.9% continuation phase of treatment. For those with human immunodeficiency
giving Syphilis, Candida, HIV and gonorrhoea as examples. Most of the virus (HIV), the CD8+T cells may have an especially important role in host
participants (99.1%) were between the age of 25-49 years with the defense to Mycobacterium tuberculosis (M.tb) as CD4+T cell function
majority (31%) being between 25-29years. The commonest symptoms and/or numbers decline. Here we performed a preliminary study to
known to the participants were genital itching (59.2%) and genital rash investigate the impact of HIV infection status on CD8+T cell effector
(14.5%).Only 2.9% did not know about the predisposing factors for STIs, function during the convalescent TB period. Peripheral blood samples from
however most mentioned multiple patners (63.7%) and unprotected convalescent HIV+ and HIV- TB subjects were used to determine CD4+T
sex (50.7%).Only 51% could identify STIs by the signs and symptoms cell count and monitor antigen-specific CD8+ T cell activation of effector
with 71.9% knowing that they are treatable and curable.40% of the function (lymphoproliferation, IFN-γ;, granulysin) in response to M.tb
participants lacked knowledge on the effects and complications of STIs antigen. Our preliminary results suggest that HIV co-infection is associated
on their health and body. Although knowledge on methods of prevention with moderate suppression of the M.tb-specific memory CD8+T cell
was high (92.3%), it was not followed by appropriate behavioural patterns compartment in many subjects convalescent for TB. Interestingly, highly
since 18.8% were found positive for STIs using the symdromic approach activated CD8+T cells were observed in recall experiments using peripheral
and 82% mentioned having suffered from STIs in the past 06 months blood from several HIV+ subjects that had low (<200 cells/mm3) CD4+T
more than once.The level of knowledge about STIs and their prevention cell counts. Further investigation may provide important information for
is not matched by sexual behavioural patterns. Many women in Katanga development of novel approaches to target M.tb-specific CD8+T cell
slum still dont practice the approppriate preventive measures for STIs . memory to protect against TB in HIV-endemic regions.
529 531
Ikechukwu N. Dozie, Donatus C. Nnadi, Chinonyerem J. Njoku,
Uche M. Chukwuocha Iveta Gagova1, Zuzana Paukovova1, John M. Muli1, Jirina Kafkova1,
Federal University of Technology, Owerri, Nigeria Marian Bartkovjak1, Daria Pechacova1, Jaroslava Brnova2, Nada
The prevalence and risk factors of pulmonary tuberculosis among HIV/AIDS Kulkova3, Lenka Michalikova2, G. Mikolasova3, Vladimir Krcmery4
patients were determined in this study. A cross-sectional study design was
Bl. Ladislaus Batthyany-Strattmann Clinic, Eldoret, Kenya, 2Faculty
adopted and hospital records from 2007 to 2011 of 375 HIV/AIDS patients of Health Sciences and Social Work, Trnava, Slovakia, 3Laboratory of
attending Highly Active Antiretroviral Therapy (HAART) Centre of Our Lady Molecular Microbiology, Bratislava, Slovakia, 4Slovak Tropical Institute,
of Lourdes Hospital Ihiala, Anambra, Nigeria, were reviewed. A standard Bratislava, Slovakia
proforma was used to generate data on other risk factors and diagnostic Incidence of bacterial sexually transmitted diseases (STD) correlates with
records. The prevalence rate of PTB among HIV/AIDS patients was 6.1%. HIV as well with Hepatitis B and C and introduction within integrated
The mean age, BMI and CD4 levels were 35.53 years (SD 9.37), 22.22Kg/ program usually has impact on multiple diseases. The aim of this research
m2 (SD 2.23) and 429.85cells/mm3 (SD 268.41) respectively. Pulmonary is to assess the impact of community based integrated health program
TB prevalence was highest among HIV/AIDS patients aged 30-39 years focused on HIV/AIDS and tuberculosis (TB) on the occurrence of bacterial
(60.9%), married patients (60.9%), patients with normal BMI (100%) STD in rural community of about 50 000 inhabitants in north Eldoret,
and patients with CD4 levels <200cells/mm3 (60.9%). Lower CD4 levels Kenya, in area of HIV prevalence of 8-14 %. Among all outpatient
<200cells/mm3 (P<0.0001), age 30-40 years (P <0.019) and marital status department (OPD) visits during last 4 years (2009-2013) in Bl. Ladislaus
(being married; P<0.005), respectively, were significantly associated with Batthyany-Strattmann Clinic serving for about 50 000 people, incidence
the occurrence of PTB among HIV/AIDS patients in this study. Co-treatment of STD and HIV in infections cases was assessed and correlated. HIV VCT
of TB/HIV/AIDS (DOTS-HAART), lifestyle modification and education to program has been established in 2008 as VCT center next to the clinic
minimize exposures to risk factors should be scaled up and encouraged. with one VCT counselor and 1 trained nurse. All VCT/HIV program and
all OPD visits for STD were recorded monthly. Syphilis and gonorrhea
530 were evaluated as STD. Among 42711 OPD visits in last 4 years, STD was
diagnosed in 1446 patients (3.39 %) and HIV in 462 patients (1.1 %).
THE IMPACT OF NUTRITIONAL STATUS ON FIRST LINE HAART However, 10 years ago, when the clinic started its work, HIV prevalence in
FAILURE IN HIV-INFECTED CHILDREN IN CAMBODIA males was 8.6 % and in females 11.9 %. Dramatic decrease of HIV was
correlated with sustained decrease of bacterial STD´s (syphilis, gonorrhea).
Jaroslava Brnova1, Katarina Dudakova2, Nada Kulkova3, Lenka
While in 2009, 505 cases of bacterial STD and 110 new cases of HIV were
Michalikova1, Andrea Shahum2, Veronika Sladeckova2, Martin
detected, 421 STD´s were diagnosed in 2010, 176 in 2011 and 201 in
Kolibab2, Julia Vujcikova2, George Benca2, Vladimir Krcmery4
2012 and 148 in 2013 were recorded followed decrease of HIV from 110
Faculty of Health Sciences and Social Work, Trnava, Slovakia, 2St. in 2009 to 53 in 2013. Unfortunately, proportion of adults with HIV and
Maximilian Kolbe Clinic, Phnom Penh, Cambodia, 3Laboratory of Molecular STD was decreasing in 2009-2013, more then 3-fold, while pediatric SDT
Microbiology, Bratislava, Slovakia, 4St. Elizabeth University, Bratislava, in children <5 years increased from 0 % to 1 % in 2009 , 3 % and 6% in
Slovakia 2010 and in 2013, respectively. Integrated HIV/STD community program
While the impact of antiretroviral treatment on growth in children is well led to more 3.3 - fold decrease of STD ad 2.1-fold decrease of AIDS
established, the influence of prior nutritional status on the response to in rural community of Eldoret after 5 years of the introduction of VCT.
treatment is not well known. The objective of this study was to assess Moreover, increasing prevalence STD in children <5 years of age is of great
impact of nutritional status on treatment failure in HIV infected children concern.
receiving first line highly active antiretroviral therapy (1st line HAART).
Nutritional status was assessed by height-for-age, weight-for-age and 532
weight-for-height Z scores using the 2006 World Health Organization
growth reference. CD4 cells counts and viral load (VL) were measured BACTERIAL INFECTION AND MALARIA IN HIV POSITIVE
every 6 months or when CD4 drop-down has been observed, consequently CHILDREN ADMITTED TO HOSPITAL IN NORTHEAST
minimally twice per years. Laboratory parameters and genotypic resistance TANZANIA; RESULTS OF A ONE-YEAR OBSERVATIONAL
tests were performed in case of clinical or immunological failure by STUDY
National Paediatric Hospital laboratory affiliated to Institute Pasteur
Cambodia, Phnom Penh. First line therapy was consisted of Zidovudine Behzad Nadjm1, Natalia R. Valero2, George Mtove3, Ben Amos4,
+ Lamivudine + Nevirapine or Efavirenz in those with concomitant Hugh Reyburn2
tuberculosis infection. In our study group of HIV infected children treated 1
Oxford University Clinical Research Unit and The London School of
with HARRT (n=98) the median Z score for HAZ, WAZ, BAZ at baseline of Hygiene & Tropical Medicine, Hanoi, Vietnam, 2London School of Hygiene
HAART was -3,3 (IQR = -4,4/-2), -3,4 (IQR=-4,1/-1,4), -1,4 (IQR=-2,3/-0,4) & Tropical Medicine, London, United Kingdom, 3National Institute for
and decreased during study period -2 (IQR=-2,7/-1,5), -2,1 (IQR=-2,4/-1,5), Medical Research, Tanga, United Republic of Tanzania, 4Teule Hospital &
-0,9 (IQR=-1,8/0,2) respectively. Concerning risk factors for treatment European Centre for Environment and Human Health, University of Exeter
failure, we compared 77 (79%) children on 1st line HAART with 21 (21%) Medical School, Exeter, United Kingdom
children with treatment failure (treated with second line regiments). Low Over three million children under 15 are now infected with HIV in sub-
CD4 cell percentage (<5%) and wasting (WAZ > - 3) at the baseline were Saharan Africa, with profound health consequences. Both HIV infection,
not significantly associated with treatment failure. In our study, baseline HIV treatment and malaria infection affect the incidence of invasive
poor nutritional status was not associated with failure of 1st line HAART bacterial disease in children and the range of causative organisms, yet
among HIV-infected Cambodian children. All of our children were placed few studies have provided these data systematically. We present data
in 2 orphanages with good nutrition (five times a day) on inpatient basis, from an observational study of paediatric admissions between June 2006
which may contribute to low failure rate. We advise the development of and July 2007 to a district hospital serving a rural population in northeast
further studies to assess the nutritional status of children with HIV/AIDS Tanzania. Children aged 2 months to 13 years admitted to the hospital
using anthropometric measurements. during study hours with fever, or history of fever, were considered eligible.
Enrolled children underwent a standard clinical examination and panel Toxoplasmosis is one of the most serious opportunistic infections in HIV/
of diagnostic blood tests including a research blood slide and rapid-test AIDS patients that lead them to their early demise. For HIV/ AIDS patients,
for malaria, blood culture and HIV serology. Children aged less than 18 cerebral toxoplasmosis causes encephalitis which worsens the patient's
months with positive serology were tested for HIV-1 RNA. CD4 T-cell condition. Human beings get infected by eating raw or undercooked
counts were performed by flow cytometry on-site. Results from this study meats containing Toxoplasma gondii cysts. Such meats come mainly
have been published, but data pertaining to the range infections in HIV from pigs, sheep and goats, especially the last two which Nigerians eat
positive patients are presented her for the first time. 3,704/4,334 (85.5%) a lot and most commonly during festivities like Christmas celebration,
of those children admitted during study hours were eligible, consented birthday celebration, Muslim festivals, etc and are sold commercially.
and enrolled. The data on 3,639/3704 (98.2%) were complete. HIV There is scarcity of information about co-infection of HIV/AIDS and
infection was diagnosed in 142/3,639 (3.9%). The most common clinical Toxoplasmosis in Nigeria. A review of available literature on the prevalence
diagnosis in children admitted with HIV was very severe pneumonia of toxoplasmosis in humans in Nigeria shows that there are about 17
(33/142 (23.2%)). In HIV positive children the prevalence of Plasmodium reports between 1960 and 2010. Of these only three show co-infection
falciparum by blood slide was significantly lower (48/142, 33.8%) than of HIV/AIDS and toxoplasmosis. Even so, the infection rate is fairly high
in HIV negative (2,147/3,497, 61.4%, p<0.001), though the median (38.8%/ 219 and 43.4%/60 and a positive case report). There is a need in
parasite density in HIV positive (22,731 parasites/µl) and HIV negative Nigeria to step-up activities involving the screening of HIV/AIDS patients
children (36,758 parasites/µl) were similar (p=0.128, Wilcoxon rank-sum). for toxoplasmosis and treating those found infected as there is treatment
HIV positive children had a higher prevalence of invasive bacterial disease for toxoplasmosis. This will prolong the lives of patients.
(27/142, 19.0%) than HIV negative children (314/3,497, 9.0%, p<0.001).
In children negative for HIV the most common bacterial isolate was non- 535
typhi Salmonella, in HIV positive children Streptococcus pneumoniae was
the most common isolate. HIV was implicated in over 1 in 8 inpatient POVERTY, FOOD INSECURITY AND LOW BODY MASS INDEX,
deaths. We were unable to show such an association between HIV ARE ASSOCIATED WITH POOR QUALITY OF LIFE FOR PEOPLE
infection and severe malaria and malarial death in this population. LIVING WITH HIV IN RURAL HAITI
Phillip J. Summers1, Molly F. Franke2, Louise C. Ivers2
Harvard School of Public Health, Boston, MA, United States, 2Partners In
PUBLIC-PRIVATE DIAGNOSTICS AND REFERRAL SERVICES Health, Boston, MA, United States
FOR HIV/TB CO-INFECTED PATIENTS: A SYSTEMATIC REVIEW Poverty, food insecurity, and HIV/AIDS often co-occur and have a
synergistic negative effect on health. However, the impact of these
Mollie Hudson, Elizabeth Fair
factors on quality of life (QOL) has only recently begun to be explored
University of California San Francisco, San Francisco, CA, United States for people living with HIV (PLWHIV) in resource-poor settings. This study
In 2012, there were an estimated 8.6 million new infections and 1.3 investigates the relationships between poverty, food insecurity, body
million deaths due to tuberculosis (1). Tuberculosis is the second leading mass index (BMI), and QOL in a cohort of 524 HIV-positive patients in
cause of death due to infectious diseases worldwide (2, 3), and is the rural Haiti. Multivariate logistic regression models were fitted to identify
leading cause of death among people living with HIV (3). The successful predictors of high QOL based on a survey containing a validated poverty
integration of tuberculosis and HIV services in both the public and private score, the Household Food Insecurity Access Scale, and three domains of
sector is essential to the fight against the dual burden of TB and HIV. The the AIDS Clinical Trials Group Health-Related Quality of Life Scale: general
WHO Stop TB department has called for a collaboration of public and health, physical functioning, and role functioning. Of 489 respondents,
private healthcare providers (often referred to as public private mix [PPM]) 246 (50%) reported severe food insecurity and 428 (88%) reported
to maximize TB/HIV integrative services while minimizing costs. Many some food insecurity. Mean QOL scores were 45 (Health), 62 (Physical),
challenges remain for engaging all care providers into integrated HIV/ and 65 (Role), out of 100. Not being severely food insecure (OR=0.453,
TB services, particularly in regards to co-current diagnostics and referrals. p=0.035; OR=0.387, p=0.008), having less poverty, (OR=0.957,
HIV patients must be screened for tuberculosis, and tuberculosis patients p<0.001; OR=0.969, p=0.005), and having a higher BMI (OR=1.1,
must be screened for HIV. An efficacious public private partnership has the p=0.002; OR=1.08, p=0.007) were each independently associated with
potential to integrate tuberculosis and HIV diagnostics and referral services higher health and physical QOL. Having access to food from a garden
to improve health outcomes and reduce patient costs. This study was (OR=1.79, p=0.05; OR=2.01, p=0.016) and younger age (OR=0.978,
undertaken to determine the frequency of public-private diagnostic and p=0.039; OR=0.97, p=0.005) were associated with higher physical and
referral services for HIV/TB co-infected patients in high burden countries? role functioning QOL. Food insecurity is highly prevalent at 88% in this
Using several electronic databases and WHO indictors, we will conduct population of PLWHIV in rural Haiti. This population's mean QOL scores
a systematic review to assess the degree of integration of various public- were also substantially lower than scores reported from other cohorts of
private partnership models for co-current HIV/TB diagnostics and referral PLWHIV in resource-poor settings. Food insecurity, low BMI, and poverty
services. We would like to evaluate the efficacy of various PPP models are independently associated with poor QOL in PLWHIV and must be
using published indicators of successful integration of services, and discuss addressed as an integral component of comprehensive HIV programs in
the subsequent policy implications of our findings. this setting.
Alex D. Acholonu
Alcorn State University, Alcorn State, MS, United States
Human Immunodeficiency Virus (HIV) has been infecting people all over
the world at an alarming rate and giving rise to full blown AIDS ( Acquired
Immune Deficiency Syndrome). Its prevalence in Nigeria is a concern.
It is at present believed to infect 3.1% of a population of 150 million.
Associated with HIV/AIDSs are opportunistic infections. Some of these
are cryptosporidiosis, Pneumocystis carinii infection and Toxoplasmosis.
536 antigen from trypomastigotes. The number of cells and morphology were
evaluated by light microscopy on Giemsa-stained cells; HLA molecule
EVIDENCE OF A DISTINCT PROFILE OF expression and cell cycle were assessed by flow cytometry. An increase
METALLOPROTEINASES 2 AND 9 AND THEIR INHIBITORS IN in the number of cells was observed, proportional to the amount of
CARDIAC REMODELING OF CHAGAS DISEASE soluble antigen used in culture from 3.95x105 cells/ml in control cells
to 7.0x105 cells/ml with 10 µg/ml, and 9.9x105 cells/ml with 100 µg/ml
Rafaelle Fares Gusmao1, Juliana A. Gomes2, Luciana R. Garzoni3, (p=0.0174). The percentage of cells in G2/M phase of the cell cycle was
Mariana C. Waghabi3, Roberto M. Saraiva4, Nayara I. Medeiros2, higher in cultures exposed to soluble antigen (8.43% and 9.36% at 10µg/
Roberta Oliveira-Prado1, Luiz Henrique C. Sangenis4, Mayara C. ml and 100 µg/ml, respectively) than control cultures (6.06%, p=0.018).
Chambela4, Fernanda F. de Araujo1, Andrea Teixeira-Carvalho1, T. cruzi infection at day four post-infection increased the intensity, but
Marcos P. Damasio2, Vanessa A. Valente2, Karine S. Ferreira2, not the percentage of HLA class I expression (mean fluorescence intensity
Giovane R. Sousa5, Manoel Otavio C. Rocha5, Rodrigo Correa- 9,634 ±2,260 for infected cultures vs. 2,986 ±1,877 for control cells,
Oliveira1 p=0.0000126); and raised the percentage of HLA class II molecules in
Centro de Pesquisas Rene Rachou, Fiocruz-MG, Belo Horizonte, Brazil, infected cultures (11.71% ± 5.63%) compared to control cultures (1.4%±
Universidade Federal de Minhas Gerais, Belo Horizonte, Brazil, 3Instituto 0.17% p=1x10-8). Exposure to the soluble antigen increased expression
Oswaldo Cruz – FIOCRUZ, Rio de Janeiro, Brazil, 4Instituto de Pesquisa of HLA class II (7.71% ±4.04 with 10 µg/ml, 11.36% ±8.36 100 µg/ml)
Evandro Chagas, FIOCRUZ, Rio de Janeiro, Brazil, 5Faculdade de Medicina, in comparison to cells without antigen (1.93% ±0.9, p=0.0168), and no
Programa de Pós-graduação em Ciências da Saúde: Infectologia e changes in HLA class I were detected. Infection by T. cruzi and exposure
Medicina Tropical, UFMG, Belo Horizonte, Brazil to a parasitic soluble antigen induce cellular proliferation as well as
Dilated chronic cardiomyopathy (DCC) in Chagas disease is associated changes in HLA molecule expression patterns of human astrocytes line,
with myocardial remodeling and interstitial fibrosis, resulting in significant implicating astrocytes as participants in the local cellular response during
extracellular matrix (ECM) modifications. ECM remodeling is regulated CNS infection.
by proteolytic enzymes such as matrix metalloproteinases (MMPs). The
main objective of this study was to evaluate the involvement of MMPs 538
2 and 9 and their inhibitors (TIMPs) in indeterminate (IND) and cardiac
(CARD) clinical forms of Chagas disease. We evaluated, for the first time, EVIDENCE OF HOMOGENEOUS DISTRIBUTION OF
the serum levels of MMPs 2 and 9 and TIMPs 1 and 2, as well as the LEISHMANIA AMASTIGOTES IN ULCERS OF CUTANEOUS
main cell sources of MMPs 2 and 9 in the peripheral blood from patients LEISHMANIASIS
presenting IND or CARD clinical forms of Chagas disease. Our results
Milagros Suárez1, Braulio M. Valencia1, Marlene Jara1, Milena
showed that MMP-9 serum levels are associated with the severity of
Alba1, Alejandro Llanos-Cuentas1, Andrea K. Boggild2, Jorge
Chagas disease. The serum levels of TIMP-1 were not different between
Arévalo1, Vanessa Adaui1
the studied groups; however the serum levels of TIMP-2 were higher in
CARD group. The correlation analysis showed a possible specificity of
Instituto de Medicina Tropical Alexander von Humboldt, Universidad
TIMP-1 for MMP-9. The analysis of MMPs production by T lymphocytes Peruana Cayetano Heredia, Lima, Peru, 2Tropical Disease Unit, Division of
showed that CD8+ T cells are the main source of both MMP-2 and MMP-9 Infectious Diseases, Department of Medicine, University Health Network-
molecules. Using a new 3-dimensional model of fibrosis we also observed Toronto General Hospital, University of Toronto, Toronto, ON, Canada
that serum from patients with Chagas disease induced an increase in the Polymerase chain reaction (PCR) testing of skin lesion specimens
extracellular matrix components in cardiac spheroids obtained from mice currently provides the most sensitive method for diagnosis of cutaneous
cardiomyocytes. Furthermore, MMP-2 and MMP-9 have showed different Leishmaniasis (CL), a disease highly endemic in Latin America. Previous
profile of correlation with matrix proteins (laminin and fibronectin) and studies that have compared the sensitivity of Leishmania detection either
inflammatory cytokines (TNF-alfa and IL-1beta) in patients with Chagas by microscopy or PCR using different sampling methods and sites on the
disease. Our results suggest that MMP-2 and MMP-9 show distinct lesion showed discrepant results. Sensitivity can be variable and dependent
activities in Chagas disease pathogenesis. While MMP-9 seems to be upon the infectious agent load and its dispersion in the lesion. We
involved with the inflammation and cardiac remodeling of Chagas disease, applied a quantitative real-time PCR assay targeting Leishmania (Viannia)
MMP-2 does not show any correlation with inflammatory molecules. In minicircle kinetoplast DNA to quantify the parasite load in biopsy, scraping
conclusion, our data stress the involvement of MMP-9, and not of MMP- and cytology brush specimens obtained from the ulcer center, base and
2, in heart disease and, for the first time, its participation in chagasic raised border. A total of 31 patients with parasitologically confirmed CL
cardiomyopathy. These data are innovative and represent an advance were enrolled: 29 males and 2 females, with median age of 34 years
in the knowledge of the mechanisms involved in the establishment/ and median disease duration of 2 months. Parasite loads in skin samples
maintenance of the Chagas heart disease pathology. varied between 1.1E+00 and 5.7E+06 parasites per µg of tissue DNA.
Median parasite loads did not differ significantly among the three sites of
537 the ulcer in all sampling methods, but there was a trend towards fewer
parasites in the ulcer border where the diagnostic specimen is usually
EFFECTS OF INFECTION AND TRYPANOSOMA CRUZI obtained. Compared to biopsies, a greater amount of parasites could
SOLUBLE ANTIGEN EXPOSURE ON A HUMAN ASTROCYTE be quantified from dermal scrapings of the border (p=0.007) and from
CELL LINE cytology brushes of the ulcer base (p=0.02) and center (p=0.01). Parasite
load measurements on biopsies versus scrapings or cytology brushes were
Gabriel A. Durán-Rehbein, Juan C. Vargas-Zambrano, John M. highly correlated [Spearman's rho range 0.75-0.95, p<0.0001]. There was
González no significant difference in parasite load according to the infecting species
Universidad de los Andes, Bogotá, Colombia (p=0.39), with L. braziliensis and L. peruviana the predominating species.
Trypanosoma cruzi can compromise the human central nervous system Our results suggest that in recent onset CL, Leishmania amastigotes
(CNS), especially during the acute phase of infection or in immune- distribute homogenously within the ulcer; thus, samples can be easily
suppressed hosts. Astrocytes could be essential cells in the pathogenesis and safely obtained from ulcer centers and bases preserving diagnostic
of T. cruzi's CNS infection. It is known that protozoans such as Toxoplasma performance. The use of scrapings and cytology brushes outperforms
gondii and Leishmania spp. secrete proteins that facilitate invasion and invasive biopsy. Further studies with larger samples and with longer disease
intracellular survival. This work evaluated the changes induced in a human duration are needed.
astrocyte line when: a) infected with T. cruzi trypomastigotes, b) exposed
to the live parasite separate by membrane filter, or c) exposed to a soluble
539 cruzi microorganisms were observed. The cause of heart disease in these
animals is still under investigation. Based on these results, T. cruzi is one of
3D MODELS OF SAND FLY SALIVARY PROTEINS the causes of heart disease in the chimpanzees at SNPRC, however it is not
the main cause.
Michal Sima, Marian Novotny, Iva Kolarova, Petr Volf
Charles University in Prague, Faculty of Science, Prague, Czech Republic 541
Sand flies (Diptera: Phlebotominae) are vectors of Leishmania
(Trypanosomatidae), the causative agents of cutaneous and visceral INFECTION BY LEISHMANIA BRAZILIENSIS IS ALTERED IN
Leishmaniasis. During the blood feeding, sand fly females inject saliva U937 DERIVED MACROPHAGES EXPRESSING EXOGENOUS
into the host skin to overcome host haemostatic mechanism. Many GFP
proteins with distinct functions were found in cDNA library of sand
fly salivary glands. 3D models of salivary proteins would allow us to
Clemencia Ovalle-Bracho1, Diana Londoño-Barbosa1, Carlos
better understand the protein function in antihaemostatic and immune
Franco-Muñoz1, Carlos Clavijo-Ramirez2
responses. Our study was focused on yellow-related proteins, the high
Centro Dermatologico Federico Lleras Acosta, Bogotá, Colombia,
affinity binders of the host prohemostatic and proinflammatory biogenic
Universidad Nacional de Colombia, Bogotá, Colombia
amines such as a vasoconstrictor serotonin. In Lutzomyia longipalpis, Gene knock-down mediated by RNA interference is increasingly used
it has been shown that salivary yellow-related proteins bind serotonin during the study of host-parasite interaction. Often exogenous gene
into their binding pocket located in the central part of the molecule, expression such as GFP is used as a reporter during functional assays.
thereby hamper its physiological function and allow blood feeding of The aim of this work was to evaluate exogenous gfp as a positive control
sand fly females. We took advantage of the known 3D structure of L. in order to verify RNAi mediated gene silencing, in the context of U937
longipalpis yellow-related protein. The predicted 3D structures showed derived macrophages infected by Leishmania braziliensis. Parental cell line
interspecies variability in the amino acid residues inside the binding pocket. U937 was genetically modified via lentiviral transduction with a construct
For example, the bond of serotonin is probably stronger in P. orientalis encoding for constitutive expression of GFP, generating the cell line
yellow-related protein PorMsp24 than in 3Q6K of L. longipalpis due to U937-GFP. In turn this cell line was transduced with vectors encoding for
the substitution of phenylalanine for glutamine and the new possible a shRNA targeting GFP or a non-relevant shRNA as negative control, to
hydrogen bond between serotonin and glutamine. Such substitutions generate the cell lines U937-GFP/shRNA-GFP and U937-GFP/shRNA-NR,
may affect the binding ability of yellow-related proteins. In L. longipalpis, respectively. The three U937 derived cell lines were characterized in terms
the binding ability differs also between the yellow-related protein variants of GFP expression by Western blot, as well as their ability to be infected by
within the species. Since there are several yellow-related proteins in Leishmania braziliensis. One-way ANOVA and Sidak test were applied for
each sand fly species, we constructed 3D models to predict also the statistical analysis using STATA 13 software. Results showed a reduction of
interspecies variability in serotonin binding ability. Yellow-related proteins 88.9% in GFP levels in the cell line U937-GFP/shRNA-GFP while there was
are also highly antigenic for hosts and are considered as candidates for no change in GFP expression in the negative control U937-GFP/shRNA-NR.
transmission blocking vaccine against Leishmaniasis, which means the In functional terms, the U937-GFP cell line showed reduced infection rate
need to know their exact function and structure. 3D models of sand as compared with the parental cell line U937. Interestingly, this infection
fly salivary yellow-related proteins were constructed in MODELLER and parameter was reconstituted to parental levels, in the U937-GFP/shRNA-
visualised in The PyMOL Molecular Graphics System. GFP cell line, but remained low in the negative control U937-GFP/shRNA-
NR still expressing GFP.This suggests that expression of GFP is responsible
540 for the reduction in infection rate observed in the U937-GFP cell line.
Caution should therefore be considered when using GFP exogenous
SPONTANEOUS HEART DISEASE IN THE ADULT CHIMPANZEE: expression in this cellular model of human macrophages.
Nestor G. Astorga 542
St. Mary's University, San Antonio, TX, United States GENETIC DIVERSITY IN LEISHMANIA DONOVANI FROM SRI
Heart disease is the leading cause of death in the United States, and LANKA: USE OF MINICIRCLE DNA FOOTPRINT ASSAY
kills over 650,000 people annually. A high incidence of heart disease,
especially idiopathic cardiomyopathy, is seen in chimpanzees and is the
K.K.G.D.U. L. Kariyawasam1, Tasaduq H. Wani2, H.V.Y. D.
leading cause of death in chimpanzees at the Southwest National Primate
Siriwardena1, A. Selvapandiyan2, Hira L. Nakhasi3, Nadira D.
Research Center (Seiler 2009). The high prevalence of heart disease-related
mortality in captive colonies makes chimpanzees a valuable animal model
Faculty of Medicine, University of Colombo, Colombo, Sri Lanka,
for studying heart disease. The aim of this study was to retrospectively
Institute of Molecular Medicine, New Delhi, India, 3Division of Emerging
examine potential contributing factors and causes of heart disease in and Transfusion Transmitted Diseases, Food and Drug Administration,
chimpanzees with emphasis on Trypanosoma cruzi (T. cruzi). We reviewed Bethesda, MD, United States
necropsy reports of adult chimpanzees that died with heart disease as a Leishmaniasis comprises a variety of syndromes primarily due to at
histopathological finding. We examined age, sex and cause of death. The least 16 species and subspecies of Leishmania. In humans, the clinical
overall prevalence of heart disease in chimpanzees was 67.81% (Seiler spectrum ranges from asymptomatic infections to high mortality, with
2009). Of these, 30.12% have myocarditis and the remainder died of three distinct forms being classically described: visceral (VL), cutaneous
cardiomyopathy. We divided the animals into two groups based clinical (CL) and mucocutaneous (MCL). Leishmaniasis is a recently established
findings and histopathological characteristics. Group1: myocarditis and disease in Sri Lanka with over 3000 cases of CL distributed island-wide
Group2: cardiomyopathy. Myocarditis was indicated by lymphocytic with a few visceral and mucosal cases reported during the past decade.
infiltration of the myocardium. Cardiomyopathy was characterized by A genetically distinct variant of the usually visceralizing L. donovani is the
diffuse myocardial fibrosis with minimal inflammation. By simple PCR, causative agent and has been studied here using mitochondrial minicircle
we tested 78 heart tissue samples from chimpanzees in these groups footprint assay to further understand its genetic status. Extracted parasite
for the presence of T. cruzi DNA. Of the chimpanzees that died of heart DNA from skin lesions of 34 CL patients and bone marrow aspirates of
disease, only 19% tested positive for the presence of T. cruzi. Of all of 4 VL patients were subjected to kDNA minicircle PCR followed by its
the animals tested, the myocarditis group was 23% positive for T. cruzi comparative sequence analysis through dendrogram using 6 reference
while 18% of the cardiomyopathy group tested positive. Combined, the Leishmania species as previously reported. Sri Lankan isolates from skin
percentage that tested positive was 19% (15/78). In some tissues (2/35), T. lesions made a separate cluster within other known L.donovani. There
were 4 distinct subclusters seen within the Sri Lankan group with isolates isolates belonged to DTU V. For drug sensibility studies, epimastigotes
that demonstrated poor response to standard drug (intra-lesional sodium were cultured in LIT media (106/mL) and treated with 0.38-150 µM
stibogluconate) forming a separate subcluster. No specific clustering of Benznidazol (BZ), Nifurtimox (NX), Pentamindine isethionate (PENT)
of clinical isolates based on their geographical origins across Sri Lanka and dihidroartemisinin (DH) during 72 h; SylvioX10/4 clone was used
was apparent in the dendrogram. Distinct genetic mutations with as reference strain. AR-SE23C, AR-FC553 and AR-FC202113 isolates
specific functional characteristics are likely to induce drug resistance. were as susceptible to BZ (IC50= 3.35±0.5; 7.66±0.0 and 2.25±1.0
However, correlations between L.donovani minicircle based strain specific µM respectively) and NX (IC50=5.06 ±0.2; 5.54±0.1 and 1.21±0.2 µM,
sequence heterogeneity and distinct clinical characteristics needs further respectively) as Sylvio-X10/4 (IC50= 4.22±0.4 and 5.29±1.3 µM for BZ and
investigation. Table of Contents NX, respectively). In contrast, significantly higher dose of BZ (73.08±4.3
and 40.62±3.1 µM) was required to reach IC50 for BOL-FC10A and
543 AR-FC195205 isolates, respectively, and of NX (14.11±2.3 µM) for AR-
FC195205 isolate. AR-SE23C, AR-FC553, AR-FC202113 and AR-FC195205
APPLICATION OF MOLECULAR TECHNIQUE FOR THE were similarly susceptible to PENT, with ID50 ranging from 2.68±2.1 to
DETECTION OF VISCERAL LEISHMANIASIS IN BLOOD 4.09 ± 0.1 µM; instead, 10.27±1.7 µM of this compound were necessary
DONORS IN ENDEMIC AREA FOR LEISHMANIASIS IN to reach IC50 for BOL-FC10A. All isolates were similarly resistant to
FORTALEZA-CEARÁ, BRAZIL DHIC50 as compared to BZ, NX y PENT. Preliminary studies on C3H/He
mice infected with AR-SE23C trypomastigotes and treated with 100mg/
Daniela C. Monteiro1, Raissa Fontes Matos1, Claudenia Costa kg/day BZ and NX during 30 days showed that conventional treatment is
Praciano1, Danielle Malta Lima2, Margarida Maria de Pompeu1 effective to diminish mortality rate and parasitaemia levels. Nevertheless,
Universidade Federal do Ceará, Fortaleza, Brazil, 2Universidade de histopatological analysis revealed that neither drug was effective to clear
Fortaleza, Fortaleza, Brazil tissue parasites and ameliorate the inflammatory process generated in the
Leishmaniasis is caused by protozoa of the genus Leishmania and is acute phase. In conclusion, we here confirm the predominant circulation
endemic in 98 countries, affecting the poorest mainly in developing of T. cruzi DTU V in Argentina, which includes subpopulations with a wide
countries. In 1991 the World Health Organization (WHO) raised the range of susceptibility to trypanocidal agents in vitro. MINCYT/FONCyT-
issue that there is the possibility of transmission of Leishmania by blood PICT 2010-2148
donors. The conditions of storage of blood products allow the survival
and maintenance of infectivity of Leishmania in blood banks and to 545
date, serologic screening is not done in blood donors in Brazil. In areas
of transmission, asymptomatic carriers represent a large contingent, it is UTILITY OF DIFFERENT CLINICAL SAMPLES OF LEISHMANIA
important to evaluate the possibility of blood products are a potential risk (VIANNIA) BRAZILIENSIS LESIONS TO CONDUCT
for transmission of the parasite. In this study, buffy coat of blood donors of MICROSATELLITE ANALYSIS
the Center of Hematology Ceará (Hemoce), were analyzed by conventional
Erika S. Perez-Velez1, Maxy B. De los Santos2, Juan F. Sanchez2,
PCR to look for circulating Leishmania and PCR positive sample were
Marianela Ore3, Michael B. Deshotel4, G. Christian Baldeviano2,
randomized to perform sequencing for confirmation of the parasite. From
Kimberly Edgel5, Andres G. Lescano2
May to November 2011, 351 samples of buffy coat of blood donors were
analyzed. All of them had a negative serology for Chagas Disease, Syphilis,
Universidad Nacional Mayor de San Marcos, Lima, Peru, 2U.S. Naval
HIV I and II, HTLV I and II, Hepatitis B and C. For the conventional PCR Medical Research Unit - 6, Lima, Peru, 3Comando de Salud del Ejercito,
reaction, specific primers (150 and 152) for the genus Leishmania were Lima, Peru, 4Department of Tropical Medicine, Tulane University, New
used, described by Oliveira, 2005, referring to a sequence of the minicircle Orleans, LA, United States, 5Department of Malaria, Naval Medical
fragments kDNA with 110pb. The presence and integrity of the human Research Center, Silver Spring, MD, United States
DNA was verified by amplifying the β-globin gene, generating a fragment Leishmania (Viannia) braziliensis (LVB) is the main cause of cutaneous
of 252 bp described by Pizzuto, 2001. DNA of Leishmania was detected and mucocutaneous Leishmaniasis in the Americas. Microsatellites are
in peripheral blood from 15/351 (4.3%) donors. The sequencing of 6/15 DNA sequences repeated consecutively and present in abundance in non-
(40%) of the positive PCR confirmed that the isolated gene is belonging coding regions of the eukaryotic genome. The variation in the number
to the genus Leishmania. The results indicate the presence of Leishmania of repeats creates different alleles, allowing estimation of the genetic
in blood donors and this implies in potential risk of transmission by blood diversity of populations and gene flow. DNA from in vitro culture has
transfusion depending on the parasite load. The role of asymptomatic been commonly used in Leishmania microsatellite analyses because of
donors infected with Leishmania in the chain of transmission is still not the quality of DNA and ease of standardization. However, parasite culture
well established, so the possibility of transmission of the parasite by is difficult to obtain in field conditions. Other clinical samples are easier
asymptomatic carriers must be better evaluated. to collect, transport and maintain, but their use in population diversity
studies has not been evaluated. Therefore, we assessed the viability and
544 repeatability of microsatellite analyses based on different clinical samples
from the same patients. We studied 22 cutaneous Leishmaniasis cases
MOLECULAR CHARACTERIZATION AND DRUG by LVB confirmed by nested real time polymerase chain reaction (PCR)
SUSCEPTIBILITY OF TRYPANOSOMA CRUZI ISOLATES and tested 53 clinical samples including cultures (22), biopsies (13), filter
DERIVED FROM INFECTED HUMANS OF ARGENTINA paper imprints (9) and scrapings using lancets (9). Samples were collected
in Lima and six other cities of Peru during one year. Genomic DNA was
Luz P. Quebrada Palacio, Mariela N. González, Bibiana Volta, extracted using the Qiagen DNeasy Blood and Tissue kit. Nine previously
Alina E. Perrone, Yolanda Hernández Vasquez, Jacqueline Búa, described microsatellite markers were tested by PCR and fragments
Miriam Postan amplified were analyzed to identify alleles using capillary electrophoresis in
Instituto Nacional de Parasitologia, Ciudad Autonoma de Buenos Aires, a 3130xl Genetic Analyzer (AB). We tested if all clinical samples amplified
Argentina the nine microsatellite markers equally frequently and if PCR products
The genotype of Trypanosoma cruzi was related to the transmission from biopsies, lancets and filter papers showed the same allele peaks (± 2
cycle and geographic region. Herein, we studied the phenotype and base pairs) as PCR products from cultures. On average, cultures amplified
susceptibility to trypanocidal agents of 5 T. cruzi populations recently significantly more markers than the other samples (8.4 versus 5.6 to 6.3)
isolated from 3 chronically infected adults (AR-SE23C, BOL-FC10A and but all clinical samples showed the same alleles peaks as cultures for the
AR-FC553) and 2 children with congenital infection (AR-FC202113 and nine markers in >90% of the cases. Seven markers had the same alleles
AR-FC195205) living in Argentina. Molecular analysis showed that all in >95% of the cases. Culture strains of LVB amplify more microsatellite
markers compared to other clinical samples, but the alleles identified are this set, 4 strains have been selected for introduction of three different
similar across all type of samples. Considering that cultures are difficult to drug resistance markers. Selection of double-drug resistant hybrids was
obtain in field conditions, the use of other clinical samples may allow a performed by culturing midgut homogenates of co-infected sand flies in
better characterization of the population structure and genetic diversity in the presence of both drugs. Here we present genetic evidence illustrating
this important parasite. patterns of inheritance and gene exchange in this Old World species.
546 548
Natalie M. Bowman1, Daniel Clark2, Jeong Choi2, Gerson Galdos
Claudia P. Herrera, Meredith H. Licon, Samuel Jameson B. Cardenas3, Mauricio Dorn4, Omar Gandirilla5, Anne Palumbo5,
Jameson, Pierre Buekens, Dawn M. Wesson Lisbeth Ferrufino6, Leny Sanchez2, Lousia Messenger7, Jorge L.
Tulane University, New Orleans, LA, United States Flores Franco4, Ronny P. Colanzi Zeballos6, Steven R. Meshnick8,
Caryn Bern9, Robert H. Gilman3, Jonathan J. Juliano1
The most current nomenclature of Trypanosoma cruzi recognizes six
discrete typing units (DTUs), TcI-VI and a seventh one named Tcbat. TcI is
University of North Carolina at Chapel Hill, Chapel Hill, NC, United States,
highly heterogeneous and can be divided into 5 distinct subgroups TcIa-
AB Prisma, Lima, Peru, 3Johns Hopkins Bloomberg School of Public
TcIe, based on differential amplification of the miniexon intergenic region. Health, Baltimore, MD, United States, 4Hospital San Juan de Dios, Santa
Though T. cruzi is endemic to Latin America, it has a marked presence in Cruz, Plurinational State of Bolivia, 5AB Prisma, Santa Cruz, Plurinational
the United States. Despite the presence of an adequate vector for T. cruzi State of Bolivia, 6Universidad Catolica Boliviana San Pablo, Santa Cruz,
in Triatoma sanguisuga and one of the United States' few areas with an Plurinational State of Bolivia, 7London School of Tropical Medicine and
autochthonous case of human Chagas disease, there exist few studies Hygiene, London, United Kingdom, 8University of North Carolina Gillings
exploring the genetic variability of Southeastern Louisiana's T. cruzi parasite School of Global Public Health, Chapel Hill, NC, United States, 9University
populations particularly with respect to the TcI haplotypes. In the presented of California San Francisco, San Francisco, CA, United States
study, 60 rodent hosts and 12 T. sanguisuga vectors were captured from Chagas disease, caused by the protozoan Trypanosoma cruzi, causes
the site of Louisiana's local human T. cruzi infection. DNA extractions an unusual and severe neurological syndrome in immunocompromised
were prepared from rodent tissues and from cultures established from patients such as those infected with HIV. We characterized the genetic
vector feces. T. cruzi prevalence was determined by diagnostic PCR, diversity of T. cruzi infection in several HIV-infected Bolivian patients with
subsequent PCR genotyping methods allowed for detection of specific TcI high-level parasitemia. Samples were derived from HIV-positive patients
sub-genotypes. Amplification of T. cruzi satellite DNA revealed 76.6% of recruited into an epidemiological study of HIV/Chagas disease coinfection
infection among sampled rodents. Twenty two T. cruzi-positive rodents in Santa Cruz, Bolivia, and DNA was extracted from whole blood or
could be genotyped by differential amplification of the mini-exon and guanidine-preserved samples using QiaCube extraction robot. T. cruzi
19 (86.4%) were found to be TcI. Eight samples of feces from vector infection was confirmed with RT-PCR. We used nested PCR to amplify
(66.6%) were trypanosomatid- positive by direct microscopic observation. a 327-base pair fragment of the polymorphic TcSC5D gene, which has
Six strains were successfully isolated and genotyped as TcI. All TcI previously been used for strain typing, and amplicon deep sequenced
samples were further typed as haplotype TcIa. The findings presented the region using an Ion Torrent PGM. We determined multiplicity of
here corroborate existing literature on North American T. cruzi genetic infection and genotyped the strains of T. cruzi using deep sequencing and
distribution as well as the current proposed geographical distribution of conventional restriction fragment length polymorphism (RFLP) methods.
the TcI haplotypes. Further studies are required to fully assess the broader Sequences were clustered to predict genotypes using a heuristic clustering
applicability of this study; however, it provides an epidemiological snap- algorithm. Within-host and within-population diversity indices were
shot of the sampled region, enhancing our current understanding of calculated using EstimateS. We have shown that deep sequencing of T.
regional T. cruzi phylogeography. cruzi from clinical samples is possible. Furthermore, we have documented
polyclonal infections in HIV-coinfected patients, which may have
547 implications for the pathogenesis of the disease in this population. Further
studies will examine parasite diversity in a larger sample size and compare
GENETIC EXCHANGE IN LEISHMANIA TROPICA T. cruzi strains found in blood and cerebrospinal fluid.
Stefano Iantorno1, Kashinath Ghosh2, Audrey Romano2, James
Cotton3, Alain Debrabant2, Phil Lawyer2, Michael Grigg2, Matt 549
Berriman3, David Sacks2 ARTINM ADMINISTRATION DURING ACUTE EXPERIMENTAL
National Institutes of Health/University of Cambridge, Washington, DC, INFECTION WITH TRYPANOSOMA CRUZI PROMOTES
United States, 2National Institutes of Health, Bethesda, MD, United States, PROTECTION AGAINST THE PARASITE
Wellcome Trust Sanger Institute, Cambridge, United Kingdom
Leishmaniasis is a parasitic disease caused by protozoan intracellular Camila B. Miguel1, Thiago Aparecido Da Silva2, Wellington
parasites of the genus Leishmania. Leishmania species can show Francisco Rodrigues1, Maria Cristina Roque-Barreira2, Javier Emilio
different clinical presentations, ranging from non-lethal cutaneous and Lazo Chica1
mucocutaneous Leishmaniasis, which typically leave disfiguring scars,
Universidade Federal do Triângulo Mineiro, Uberaba, Brazil, 2Faculdade de
to visceral leishmaniasis, which can be lethal if left untreated. While Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP,
traditionally thought to propagate asexually, hybridization has been Brazil
unequivocally demonstrated to occur in the sand fly stages for L. major, Chagas disease is caused by infection with Trypanosoma cruzi, and
and evidence has also been found more recently in L. donovani. L. tropica the profile of the host immune response is essential for the infection
is an emerging Old World species that is responsible for severe cutaneous control. ArtinM, from Artocarpus heterophyllus, a lectin that binds
disease throughout its range, from India to Northern Africa. From a to the manotriose, modulates immunity toward Th1 axis and confers
sample set of 36 isolates, 25 nuclear markers and 3 kinetoplastid DNA resistance to intracellular pathogens. Then, we analyzed the ArtinM
markers were amplified and sequenced for multi-locus genotype analysis immunomodulatory property during acute experimental infection with T.
(MLSA). The preliminary sequence data shows extensive heterozygosity, cruzi: Male BALB/c mice (10 mice/group) were used at 10 weeks-old, and
indicative of potential ongoing hybridization occurring in this species. From the infection was realized with T.cruzi (3000 trypomastigotes; "Colombian
strain"). The ArtinM administration (0.5μg/100μL; i.p.) was performed 551
before infection (-5, -4 and -3 days) and post–infection (5, 10 and 15
days), and as negative control was used the vehicle (saline), followed by LABORATORY FINDINGS OF ACUTE INFECTION WITH
groups: Saline control (SC), Saline infected (SI) and Lectin infected (LI). TRYPANOSOMA CRUZI FOR DIFFERENT CONCENTRATIONS
Parasitemia was determined at 7th, 14th and 21th days post-infection. OF THE STRAIN "Y" IN THE INOCULUM
The hemogram, reticulocyte count, cytokines measurement (plasma and
heart), histological analysis of heart (inflammatory infiltrate and nests of Paulo Ricardo Dos Santos, Wellington Francisco Rodrigues,
amastigotes) were performed after 23 days of infection. Inflammatory Camila Miguel, Patricia Kellen Martins Oliveira Brito, Carlo Jose
infiltrate was measured in H&E stained heart sections, through the point's Freire de Oliveira, Javier Emilio Lazo Chica
grid with predetermined area that express the area (%) of inflammatory Universidade Federal do Triângulo Mineiro, Uberaba, Brazil
infiltrate. This method was used to determinate the number of nests of Hematological and urinary parameters are often used for screening and
T.cruzi by immunohistochemistry. IL group shows significant decrease in confirmation of various diseases. In Chaga's diseases highlighted the
parasitemia at 14th and 21th days of infection. IS and IL showed increased clinical and laboratory findings are the result of a multifactorial infection
reticulocytes, total leukocytes, neutrophils, lymphocytes and monocytes, with Trypanosoma cruzi. Moreover, recent studies demonstrate that
and the hematimetrics parameters were decreased, ArtinM administration variations of the antigenic concentrations may influence the course of
promotes a significant reduction in the inflammatory infiltrate (% of area) disease, as well as the functional response of the infected organism.
and nests of T.cruzi in the heart. Moreover, low levels of IL-12 p40, IFN-γ This way, this study aimed to report the laboratory findings in acute
and TNF-α were found after ArtinM treatment, and IL-10 production experimental T. cruzi infection with different inoculums through
was elevated, verified in plasma and heart. Thus, ArtinM administration hematological and urinary parameters. Mice C57BL/6, males, aged 8
demonstrates a protective effect against T.cruzi during acute experimental to 10 weeks, weighing 20 to 25g were infected with different parasite
infection. loads (3x102, 3x103 and 3x104) through strain "Y" of T. cruzi. The
curve of parasitemia was performed until the 12th day after infection.
550 Hematological parameters were evaluated using the complete blood
count (automated method - ABX MICROS 60) on days 6, 9 and 12 after
INFLUENCE OF LOAD PARASITIC IN INFLAMMATORY infection. The analysis of urinary parameters was performed through
RESPONSE AND DEVELOPMENT OF INTESTINAL INJURY IN physicochemical analysis and urine sediment after 9 days of infection. The
MICE INFECTED WITH TRYPANOSOMA CRUZI onset of parasitemia curve varied with the concentration of parasites in
the inoculums on the 3rd, 4th and 5th days, for high, medium and low,
Javier Emilio Lazo Chica, Bruna Perez Vasquez, Camila Miguel,
respectively. The period of peak occurred for the high, medium and low
Thais Perez Vasques, Maria Tays Mendes, Carlo Jose Freire de
inoculums on days 10, 9 and 8 respectively after infection. Any assessment
Oliveira, Wellington Francisco Rodrigues
of the blood count (red blood count, reticulocyte count, white cells and
Universidade Federal Do Triângulo Mineiro, Uberaba, Brazil platelets) and urinary parameters (sediment), we observed changes in
The acute phase of Chagas' disease is reported to be multifactorial; the high-inoculums when compared with the control (p <0.05). However
among the forms of evolution of the most common disease have cardiac laboratory evaluation by hemogram and urine routine are able to detect
and digestive forms, this last in the esophagus and colon. Therefore, modifications, dependent on the parasitic load.
this study aims to evaluate variations of antigenic concentrations in the
intestinal lesions in mice with acute Trypanosoma cruzi infection. We used 552
40 male mice C57BL/6WT divided into control group (A) and infected
groups with 3x102 (B), 3x103 (C) and 3x104 (D) forms trypomastigotes of EVALUATION OF METABOLITES NITROGEN IN MICE
strain "Y" of T. cruzi. From a total of eight groups, four were euthanized CBL57BL/6 INFECTED WITH DIFFERENT INOCULA OF STRAIN
after 7 (S) days of infection, and the remaining groups after14 (F) days. "COLOMBIAN" OF TRYPANOSOMA CRUZI
The parasitemia was performed daily from day 3 after infection until
the time of euthanasia. In the morphometric analysis, we verified the Patricia Kellen M. Brito1, Camila Miguel1, Wellington Francisco
area myositis, ganglionitis and periganglionitis in relation the area of the Rodrigues1, Ricardo Cambraia Parreira2, Paulo Ricardo Dos Santos1,
muscle layer of the colon. Also analyzed the width and thickness of the Carlo Jose Freire de Oliveira1, Javier Emilio Lazo Chica1
muscular layer and of the colon mucosa. By immunohistochemistry, we 1
Universidade Federal do Triângulo Mineiro, Uberaba, Brazil, 2Universidade
detected the presence of T. cruzi nests. The quantification of the cytokines Federal de Minas Gerais, Belo Horizonte, MG, Brazil
were performed by CBA. In results, there was an increase in parasitemia Chagas' disease is a neglected tropical disease caused by Trypanosoma
dependent on the concentration of inoculum between the different cruzi. Through increased catabolism, is associated also with renal disorders.
groups. Immunohistochemistry showed antigenic labeling in all animals This study aimed to evaluate the nitrogenous wastes from C57BL/6 mice
of the group DF and in no animal of the BS group. The periganglionitis, infected with different inocula of T. cruzi. 70 mice male C57BL/6 were
ganglionitis and myositis were growing between the groups (significant used at 12 weeks of age, weighing between 20 and 25g. The T. cruzi
differences), except to groups C and D, seven and fourteen days. The infection was performed with an inoculum of 3x102, 3x103 and 3x104
mucosal thickness showed no differences between groups. The width of trypomastigotes of strain "Colombian". The animals were divided in
the colon did not change between groups, except for DF, where there groups: non-infected control (GC); Infected with 300 forms (GIA); Infected
was enlargement. The thickness of the muscle layer is not changed in with 3,000 forms (GIB) and Infected with 30,000 forms (GIC), both for
groups euthanized at 7 days, but after 14 days of infection in CF was 22 and for 31 days. Held parasitemia every 3 days, the 24-hour urine
hypertrophy and a reduction in DF. In the results of the cytokines, there collection in individual metabolic cages and blood collection. Urea levels
was a noticeable change in the highest inoculum having an IL-2 after 7 were made by ultra-violet method and creatinine by colorimetric kinetic
and 14 days, and IL-6, IFN-g and TNF-a only 14 days, in which IL-10 did method, both in blood and in urine 24 hours a spectrophotometer. There
not differ significant between groups. In conclusion, the parasite load and was a decrease in urinary volume on the GIC after 22 days of infection
the time of infection directly influence in the number of nests of T.cruzi and GIB, GIC 31 days after infection, beyond the weight decrease of the
present in the colon, but not interfere with the mucosal thickness. There GIC group of animals on both days. For the BUN there was an increase
is a hypertrophy of the muscle layer in CF and decreased thickness of to of levels GIC (22 days) and GIC and GIA (31 days). Levels of urinary
muscle in DF at the expense of enlargement of the colon, with alterations urea reduced in the group GIB (22 days) and in GIC (31 days). The plasma
significants in production of citokines proinflammatory. creatinine showed a tendency to increase in all groups after 22 days of
infection, whereas after 31 days there was a reduction in the levels for
GIB and GIC. Decrease in urinary creatinine levels in groups GIB and GIC
(22 days) and normal values for all groups 31 days. The BUN / creatinine antigenic characterization and drug sensitivity tests. In the reference
ratio was elevated in GIC (22 days) and GIA and GIB (31 days). The levels Laboratory, the Influenza positive Isolates were characterized antigenically
creatinine clearance had decreased for GIB and GIC (22 days) while the using hemagglutination inhibition test with a panel of post ferret
group at 31 days showed normal levels. Conclusion: We conclude that antisera, and also tested for functional neuraminidase inhibition assay
there are changes in nitrogenous wastes in C57BL/6 mice infected with T. to assess susceptibility of the viruses to the neuraminidase inhibitors
cruzi, dependent on the concentration of the inoculum. oseltamavir and zanamivir drugs. The results of 136(93.8%) isolates
were available till September, 2012. 48.5 %( 66) of the isolates were A/
553 CALIFORNIA/07/2009-LIKE (H1N1) viruses,12.5 %( 17) of the isolates
were B/BRISBANE/60/2008-LIKE viruses, 4.4 %( 6) of the isolates were
POPULATION-BASED SURVEILLANCE STUDY OF INFLUENZA A/PERTH/16/2009-LIKE (H3N2) GP viruses, 4.4 %( 6) of the isolates
AND COMMUNITY-ACQUIRED PNEUMONIA MORBIDITY were B/WISCONSIN/01/2010-LIKE viruses, 1.5 %( 2) of the isolates
SYNERGISM IN UKRAINE were B/FLORIDA/04/2006-LIKE viruses, 2.2 %( 3) of the isolates were B/
VICTORIA/02/87,2.2 %( 3) of the isolates were B/YAMAGATA/16L88
Sergii Soloviov, Iryna Dzyublyk LINEAGE BY PCR, which is similar to B/Wisconsin/01/2010 virus. 21.3
P.L. Shupyk National Medical Academy of Postgraduate Education, Kiev, %( 29) of the isolates were unable to grow on the cell culture and was
Ukraine difficult for the characterization. 2.9 %( 4) of the isolates were totally
Historically, research of infectious diseases has focused on infections negative for Influenza Virus both by real time -PCR and cell culture
with single pathogens. However, infections with pathogens often occur techniques. All Influenza Positive Isolates were sensitive to Oseltamivir
in the context of other pre-existing viral and bacterial infections or and Zanamivir on functional neuraminidase inhibition assay to assess
pathological conditions. Clinically, this is of particular relevance for co- susceptibility of the Influenza viruses to the neuraminidase inhibitors
infections with pathogen Streptococcus pneumoniae and influenza virus, oseltamavir and zanamivir. All antigenically characterized Influenza Isolates
which both are the important cause of global morbidity and mortality were compatible with Influenza vaccine recommended by WHO. It also
in the world. However, the analysis of incidence data, representing the showed that diverse types of Influenza strains are circulating in Ethiopia.
possible synergy between community-acquired pneumonia (CAP), which The inability of some positive isolates to grow in cell culture may possibly
possible causative agent is S. pneumoniae, influenza and other respiratory relate to sample collection, storage and sample transportation issues and
diseases (RD) (chronic bronchitis, asthma, etc.) has never been presented need evaluations and improvements.
before in Ukraine. The aim of the research was the model-based study of
the official incidence data to identify the possible relationship between 555
CAP, RD and influenza morbidity rates during 2007-2011 epidemic
seasons in Ukraine via mathematical modeling. The official incidence SIMULATION MODELLING OF SOCIAL PROTECTION
data, published annually by Influenza Control Center and FG Yanovsky INTERVENTIONS FOR TUBERCULOSIS (TB) AND CHRONIC
National Institute of Phthisiology and Pulmonology, was analyzed. As a AIRWAY DISEASES (CAD) IN MALAWI
result it was proposed conceptual synergy model of CAP, influenza RD
morbidity among the population of Ukraine. The model parameters were
Elvis S. Gama
found by the program developed in Java and based on the quasi-gradient Liverpool School of Tropical Medicine, Liverpool, United Kingdom
method. The highest CAP morbidity rate in Ukraine was in 2009-2010 yrs., Catastrophic health care expenditure has emerged as one of the concerns
exceeding corresponding value for 2008 by 24.2 % and for 2011 - by 5 among global health practitioners particularly in low income countries.
%. The analysis of incidence data showed significantly higher morbidity To address this concern, social protection has been used as a framework
rates than average in Vinnytsia, Ivano-Frankivsk and Kyiv regions. The to address healthcare related poverty and vulnerability in these countries.
mathematical model implied the existence of functional relationship This has been followed by a growing number of governments in low
between the incidence of influenza and RD in their influence on the income countries developing and adapting social protection strategies
occurrence of complications such as CAP. Results of modeling showed in their health plans. Similarly, there is also a rising interest in social
that probably about 20% of CAP among the population of Ukraine occur protection among global health and health system researchers. Despite
as a complication after influenza (individually or against the background global interests and adoption of health care related social protection
of bronchitis, asthma and other pathological conditions related to RD). In interventions in low income countries, the implementation, uptake, equity
conclusion, it was proposed the meaningful approach to modeling that and effectiveness of current social protection interventions are limited
takes into account the functional relationship between RD and influenza by; inadequate prevailing national health budgets which are often donor
cases that led to CAP and show strong association between these diseases dependent; policies prevalent within the wider health sector and failure
and necessity of intensive preventive strategies for its control. of integration of social protection intervention by government agencies
and the health sector in general. The research was aimed at finding
554 ways of improving social protection interventions aimed at protecting
the poor and vulnerable populations in Malawi, especially those affected
THE FIRST ANTIGENIC/ANTIVIRAL CHARACTERIZATION OF by chronic airway diseases (CAD) and TB. The overall objective was to
INFLUENZA VIRUS ISOLATES RECEIVED DURING AUGUST improve delivery of CAD and TB services, by successfully engaging policy
2009-SEPTEMBER 2012 FROM INFLUENZA SENTINELS makers, healthcare providers and various stakeholders, in the generation
SURVEILLANCE (ISS) IN ETHIOPIA of new evidence about effective ways to strengthen the provision,
uptake, equity and effectiveness of social protection mechanisms in
Gelila D. Tiyo TB and CAD treatment. Simulation modelling, econometric analysis
Ethiopian Public Health Institute, Addis Ababa, Ethiopia and process evaluation studies were used to evaluate the process and
Influenza is a respiratory disease caused by RNA viruses that affects birds impact of existing social protection intervention and generate new
and mammals. The vaccinations offered every flu season target types A knowledge. Preliminary results indicate that, the involvement as partners
and B Influenza Viruses. Detection of Influenza virus using Real Time-PCR of major stakeholders directly responsible for social protection policy and
technique started in Ethiopian National Influenza Reference Laboratory interventions will ensure policy relevance of this research and its continued
during the A (H1N1) 2009 pandemic and since then laboratory sends impact beyond the life of the research project.
influenza positive samples to WHO collaborating center for Influenza at
CDC Atlanta, for further antigenic characterization and drug sensitivity
tests. A total of 145 samples that tested positive for influenza during
August 2009-September 2012 were sent to CDC Atlanta for further
556 558
Sylvia Milanoi1, Wallace Bulimo1, Benjamin Opot1, Silvanos
Neha Kothari Opanda1, George Gachara2
IVI, Seoul, Republic of Korea United States Medical Research Unit-Kenya, Nairobi, Kenya, 2Kenyatta
Phase I data from trials using protein based pneumococcal vaccine University, Nairobi, Kenya
antigens show poor immune response in humans. To address this problem Human Rhinoviruses (HRVs) are the most common causative agents
protein antigen need to be presented in a way to induce a high immune of respiratory infections. They are highly diverse (>100 serotypes) and
response and subsequent protection in humans. We have developed a display a high degree of sequence variation among individual serotypes.
conjugate vaccine in which PspA family 1 and family 2 proteins from This occurs as a result of frequent recombination events and point
Streptococcus pneumonia are conjugated to Vi capsular polysaccharide mutations.There is paucity of information about the genetic diversity of
from Salmonella typhi. The conjugation technology strongly boosts HRV strains circulating in Kenya. In this study we analyzed HRV strains
protective immune responses against Streptococcus pneumonia and identified in samples collected across the country in 2008 to provide an
Salmonella typhi.MethodWe have optimized a scalable high yielding insight into their genetic characteristics. 517 randomly selected archived
method for fermentation and purification of Vi polysaccharide and samples from the ongoing country-wide influenza surveillance protocol
two protein antigens of PspA Family. We have developed a method for were used in this study. These were nasopharyngeal specimens collected
conjugation of PspA Family 1 and 2 proteins with Vi polysaccharide from persons > 2 months, who attended outpatient clinics in the year
and tested conjugates by ELISA for their immune response in mice. We 2008 in hospitals located in 8 different regions in Kenya presenting with
have done preliminary challenge studies of the vaccine with pathogenic influenza like illnesses. Real-time RT-PCR was used to identify HRV and
strains of Streptococcus pneumoniae to check vaccine efficacy.Results VP4/VP2 genomic region amplified followed by sequencing. The resulting
A series of Vi-PspA conjugates are prepared and tested in mice. A poor nucleotide sequences of Kenyan HRV viruses were compared to those
anti-PspA response was obtained when un-conjugated PspA was used as of homotypic prototypes to determine serotypic identities. Screening by
antigen but when conjugated to Vi a substantial increase in the responses real time RT-PCR detected HRV in 131 (25%) of the samples. Of these
were obtained. Immunized mice with selected Vi-PspA1 conjugate 33 (25%) amplified successfully by conventional RT-PCR, of which upon
show 70-80% protection in the preliminary challenge studies done with nucleotide sequencing 17 (50%) yielded usable sequences. Phylogenetic
Streptococcus pneumoniae. Further challenge studies with a Vi-PspA1 and analysis based on the VP4/VP2 genomic region of Kenyan HRV strains,
Vi-PspA2 combination vaccine will be performed to enhance the protective relative to HRV prototypes retrieved from Genbank, revealed separation of
immunity against both pathogens.ConclusionThe Vi-PspA production and the sequences into three main clusters corresponding to HRV A, B and C
conjugation process is developed for the purpose of Scale up and making species. Majority of the Kenyan strains (n=10) belonged to HRVA species
a cost effective vaccine targeting developing countries. and were identified as HRV A29, A47, A1 (n=2), A56, A49, A30, A106,
A20 and A45 serotypes. Two Kenyan strains belonged to HRV B species.
557 One of these was identified as HRV B6 while the other was segregated
from the other strains. Only one Kenyan strain belonged to HRV C species
ELABORATE HEALTH RECORDS SURVEILLANCE FOR TB CASE and was identified as HRV C2. This study demonstrates circulation of
FINDING IN AN INFANT COHORT STUDY IN PREPARATION Human Rhinoviruses in Kenya. It also shows their species and serotype
FOR PHASE THREE TB VACCINE TRIALS IN WESTERN KENYA diversity.Findings from this study suggest that HRV A strains played a key
role in human respiratory infections in Kenya. Knowledge about circulating
Joseph O. Opole HRV strains is important as it may help guide development of therapeutic
KEMRI/Centers for Disease Control and Prevention, Kisumu, Kenya strategies against infections caused by these viruses.
Finding every case of Tuberculosis in infant vaccine trials is important for
efficacy endpoints. Health record surveillance could be a key source of TB 559
suspects and therefore, TB Cases. We therefore, sought to evaluate the
yield of health records surveillance for TB case finding in an infant cohort NEURAMINIDASE INHIBITOR SUSCEPTIBILITY OF INFLUENZA
in preparation for vaccine trials.The study was a prospective, observational, A ISOLATES OBTAINED IN KENYA, 2008-2011
cohort study. After enrolment, TB cases listed in TB registers were searched
Meshack Wadegu, Wallace Bulimo, Rachel Achilla, Silvanos
and matched with Health and Demographic Surveillance System data
Mukunzi, Janet Majanja, Janet Nyambura, Benjamin Opot, James
base to confirm residency and compared with the study database, if
Njiri, Steven Ocholla, Rodney Coldren
there was a march,further confirmation was done. Potential TB suspects
were also generated from: Inpatient Department, TB laboratory,Patient United States Army Medical Research Unit-Kenya, Nairobi, Kenya
Support Centre and X ray records.TB cases were found through both the Neuraminidase inhibitors mainly oseltamivir and zanamivir function both
active and passive detection systems. Interestingly the active case finding as prophylactic and treatment agents. Currently there exists no data on
through scheduled TB screening follow-up visits generated only 8 cases antiviral susceptibility profile of influenza A isolates circulating within the
(14.0%), whereas various "passive" surveillance systems located within Eastern African region. Here we characterized the antiviral susceptibility of
the health system itself identified 72% of all TB cases. 12% of TB cases the 2008-2011 influenza A viruses circulating in Kenya. RNA was extracted
were diagnosed post mortem via verbal autopsy. In contrast to other infant from virus isolates followed by PCR amplification of NA gene segments.
cohort studies, incentivized individual health seeking behavior of parents Nucleotide sequencing of the NA amplicons was carried out using the
likely played a significant role in increasing the effectiveness of the passive BigDye chemistry prior to analyses using a suite of bioinformatics tools.
system. Elaborate Health records surveillance for TB case finding is labor IC50 values were determined using curve fitting software, Grafit 7.0.
and resource intensive, however, is likely to be more useful than routine TB Out of 836 influenza A viruses 108 isolates were analyzed for markers
screening to capture each endpoint in vaccine efficacy trials. Improvements of resistance to NA inhibitors. 7 of the 11, 2008 seasonal influenza A/
are needed to reduce the proportion of TB cases detected post mortem H1N1 isolates depicted oseltamivir resistant marker H275Y while all 33
influenza A/H3N2 isolates had H275 hence were sensitive to oseltamivir.
Similarly, genetic analyses of the A (H1N1) pdm09 strains in 2009 and
2010 showed that all had H275 marker. All the 14 influenza A/H3N2
isolates of 2011 had H275 marker. A total of 28 isolates were analysed 561
for phenotypic susceptibility assay. The mean zanamivir IC50s were
1.75nM, 2.53nM and 1.84nM for the subtypes H1N1, pH1N1 and H3N2 TUBERCULOSIS AND WAR IN THE U.S. MILITARY
respectively. Most of the 2008-2009 (8) sH1N1 analysed showed highly
reduced sensitivity to oseltamivir. The IC50s in the fluorescent assay ranged James Mancuso
from 73nM-984nM. Pandemic A/H1N1 strains obtained between 2009- Uniformed Services University of the Health Sciences, Bethesda, MD,
2011 indicated oseltamivir IC50 ranges of 1.60nM-6.32nM categorised as United States
normal sensitivity. All the 8, influenza A/H3N2 isolates obtained between Studies which have demonstrated increased morbidity and mortality from
2008-2011 were sensitive to oseltamivir with the IC50s ranging between tuberculosis (TB) during war have largely focused on civilian populations.
0.16nM and 0.94nM. The 2011, WHO range and median IC50 values for TB also has a long and well-established association with the military, but
oseltamivir carboxylate were 0.4nM-10nM and 0.5nM; 0.1nM-5nM and the association of increased TB risk during armed conflict is less certain.
0.2nM; 0.2nM-10nM and 0.6nM for wild types sH1N1, sH3N2 and pH1N1 The purpose of this study was to examine the U.S. military experience in
respectively. The 2011, WHO range and median IC50 values for oseltamivir times of war and armed conflict to better understand its impact on the
carboxylate were 257nM-3455nM and 458.2nM; 132nm-2179nM and risk of TB. This historical study estimates the risk of TB infection, disease
191.3nM for mutant types sH1N1 and pH1N1 respectively. The WHO IC50 and mortality during these conflicts, comparing those serving overseas
values for zanamivir both for mutant and wildtype strains ranged between with civilian and military populations remaining in the U.S. TB rates in
0.2nM-3nM for all subtypes with no significant difference between the the U.S. Army declined dramatically over the period from 1885 to 2012,
mutant and wildtype strains for each subtype. H275Y mutation increased from a high of 1,168 per 100,000 in 1917 to a low of 0.4 per 100,000
the IC50 in the 2008-2009 sH1N1 isolates by 50-100 fold. Resistance to in 2012. Army rates were generally considerably lower than civilian rates,
NAI was found to be both drug and virus subtype specific. due in large part to the "healthy soldier" effect. Other than World War I,
armed conflict showed very little impact on declining TB trends. Some of
560 the focal risk groups known to have higher rates of TB included U.S. and
enemy prisoners of war (POWs), the foreign born, and others found to be
CHALLENGES FACING TB CONTROL IN INDIA FOCUSING ON infected at induction into the military. Although the risk of TB in the U.S.
THE ROLE OF XPERT MTB/RIF IN THE PUBLIC AND PRIVATE military largely reflects that of the underlying U.S. population, the military
SECTOR also has unique exposures to tuberculosis during times of armed conflict.
In order to protect the health of these troops and conserve military
Ruvandhi Nathavitharana fighting strength, these unique exposures require additional surveillance
Beth Israel Deaconess Medical Center, Boston, MA, United States and control measures.
Globally, tuberculosis (TB) remains a major public health issue with an
estimated 8.8 million new cases and 1.3 million deaths reported in 2012.
In India, this health issue is compounded by the failure to diagnose cases 562
in the national surveillance system and the high incidence of TB drug FEASIBILITY ASSESSMENT FOR ESTABLISHING
resistance. Of the estimated 3 million cases missed by national notification
systems globally, 31% were in India. Drug resistance is of increasing
concern with 3.6% of newly diagnosed TB cases and 20% of previously
treated patients having multidrug-resistant TB (MDR-TB), defined as Joan Karanja1, Wences Arvelo2, Phillip Muthoka3, Daniel Kaburu1,
Mycobacterium tuberculosis resistant to isoniazid and rifampin, with or Rosalia Kalani3, Henry Njuguna2, Josh Mott2
without resistance to other first-line drugs. There were an estimated 99 1
Field Epidemiology and Laboratory Training Program, Kenya, Nairobi,
000 cases of MDR-TB in India in 2009, including those outside the Revised Kenya, 2Centers for Disease Control and Prevention, Nairobi, Kenya,
National TB Control Program (RNTCP). The Indian RNTCP introduced the 3
Disease Surveillance and Response Unit, Ministry of Health, Kenya,
Programmatic Management of Drug Resistant TB (PMDT) to address the Nairobi, Kenya
needs of this patient population and is rapidly scaling up its services. A
Influenza A H7N9 and Middle East respiratory syndrome coronavirus
key issue in the management of MDR-TB is timely and accurate diagnosis
(MERS-CoV) are emerging respiratory viral infections with pandemic
(including drug susceptibility testing). There is interest in the promise of
potential which can result in high fatality. As of March 2014, 395 cases
point-of-care (POC) diagnostics for diseases of global health importance
and 125 deaths of influenza A H7N9 and 206 cases and 86 deaths
but a need for better appreciation of the POC testing process moving
of MERS-CoV had been reported worldwide. Kenya's high volume of
beyond the technology alone. One area of progress is the global scale up
international travel poses a risk for introduction of these pathogens.
of Xpert MTB/RIF (Cepheid Inc.), a molecular test for TB that also enables
Public hospitals in Kenya conduct severe acute respiratory illnesses
rapid detection of rifampin resistance. However, a greater understanding
(SARI) surveillance. Little is known about SARI surveillance in non-pubic
of role that the large, unregulated private health care sector plays in
hospitals where majority of foreigners and travelers are likely to seek
providing TB care is essential. The Initiative for Promoting Affordable
care. We conducted an assessment to determine the capacity of non-
Quality TB Tests (IPAQT) endorses the use of WHO approved tests such as
public hospitals to conduct SARI surveillance and to identify hospitals
Xpert MTB/RIF in private labs at affordable rates. Focus group interviews
for implementation of MERS-CoV and influenza A H7N9 surveillance. In
were conducted with health care providers from the public and private
November 2013, we interviewed managers from 44 non-public hospitals
health care sectors, the latter at sites involved with the IPAQT initiative,
in Nairobi and Mombasa counties. Respiratory illness accounted for a
to ascertain current practices and perceptions and attitudes to inclusion
range of 0-18 admissions per day. A surveillance focal person was present
Xpert MTB/RIF in the TB diagnostic algorithm. Perceived barriers to
in 32 (73%) hospitals, of whom 10 (23%) had received training in the
implementation include delays in obtaining results and cost.
last 12 months. Although requested by the Ministry of Health, national
reporting of SARI was done in 18 (41%) hospitals; 12 (67%) reported
monthly and 6 (33%) weekly. Among 28 (64%) hospitals which recorded
patients' nationalities, foreigners accounted for a median of 10% (range:
0.5%-80%) of patients. Nasopharyngeal (NP) and oropharyngeal (OP)
swab specimens were collected for clinical diagnosis in 27 (61%) and 29
(66%) hospitals respectively. In the last 12 months, 10 (23%) hospitals
had trained their staff on NP/OP specimen collection, packaging, storage
and transport to reference laboratories, and 27 (63%) had training
on use of personal protective equipment. Non-public hospitals are an
important source of medical care for foreigners and the basic capacity for ZN, LJ, and MODS. Mtb detection by string test was evaluated by MODS in
surveillance exists. These hospitals will be sensitized on the importance 92 of these. The TB-HIV co-infection rate of HIV patients with respiratory
of national reporting of priority conditions, and some will be targeted for symptoms by sputum sample was 44.9% (48/107). The mortality of TB+
implementation of MERS-CoV and influenza A H7N9 surveillance. hospitalized patients was 51.4% (18/35) and of ambulatory patients was
30.7% (4/13). The rate of MDRTB was 9%. Of 48 sputum samples positive
563 by any diagnostic method, 63% were positive by ZN, 79% by LJ, and 96%
by MODS. Median time to positive culture was 10 days by MODS versus
THE ACCURACY OF NON SEVERE PNEUMONIA DIAGNOSIS 34 days by LJ (p<0.0001). In pts not able to produce sputum without
IN TANZANIAN CHILDREN: THE VALIDITY OF THE induction, the string test had a sensitivity of 82% compared to induced
RESPIRATORY RATE sputum. Of the ten patients unable to produce a sputum sample, four
were TB-positive by the string test. MODS was faster and more sensitive
Florida J. Muro1, Nicole Zamsaeur2, Hannah Wangai3, George for Mtb detection when compared to LJ, and these differences are more
Mtove4, Jim Todd1, Raimos Olomi1, Hugh Reyburn2 pronounced in smear-negative patients, who are at the greatest risk for
Kilimanjaro Christian Medical University College, Moshi, United Republic missed diagnoses. The string test, in conjunction with MODS, is a valuable
of Tanzania, 2London School of Hygiene & Tropical Medicine, London, diagnostic technique for HIV positive sputum-scarce patients. Nine percent
United Kingdom, 3Joint Malaria Project - KCMC, Moshi, United Republic of our patients had MDRTB, which reinforces the need for rapid detection
of Tanzania, 4National Institute of Medical Research, Amani Centre, Tanga, of antibiotic sensitivity testing in HIV patients in Bolivia.
United Republic of Tanzania
Integrated Management of Childhood Illness (IMCI) guidelines recommend 565
antibiotic treatment to all children presenting with cough or difficult
breathing and an increased respiratory rate for their age. However, HEALTH RISK ASSESSMENT OF PESTICIDES AND
many pneumonia diagnoses in resource poor settings are done on the POLYCHLORINATED BIPHENYLS CONTAMINATIONS IN DAIRY
bases of sub-optimal condition; the environment may not be conducive PRODUCTS FROM SELECTED FARMS IN GREATER ACCRA
for counting respiratory rates. We conducted a study to determine REGION, GHANA
if respiratory rate was likely to be transiently raised by a number of
contextual factors in a busy clinic leading to overuse of antibiotics. Douglas Amoako
Respiratory rates were recorded in children aged 2 - 59 months presenting University of Ghana, Accra, Ghana
with cough or difficulty breathing to one of the two busy outpatient clinics The residual concentrations of synthetic chemicals such as organochlorines
and then repeated at 10 minute intervals over 1 hour in a quiet setting. pesticides (OCPs), pyrethroids and polychlorinated biphenyls (PCBs) in
A total of 167 children were enrolled with a mean age of 7.1 (SD±2.9) dairy products (milk, yoghurt, cheese) from selected farms in Ghana
months in infant and 27.6 (SD±2.8) months in the older age group. The were analyzed using Gas Chromatography (GC). A total of 50 samples
mean respiratory rate declined from 37.5 breaths per minute (bpm) at of dairy products (9 cheese, 25 cow milk and 16 yoghurt) were analyzed
clinic to 35.8 bpm initial reading at quiet room and 35.0 bpm final reading for OCPs, pyrethroids and PCBs. Of the numerous pesticides evaluated,
(p<0.02). This resulted in 11(85%) being mis-classified with non severe detectable levels of OCPs (β-HCH, endrin, heptachlor, endosulfan, p'p-DDT
pneumonia in infants and 2(13%) in older children. In a logistic model and methoxychlor);Pyrethroids (permethrin, allethrin, cypermethrin and
age group (infant or older child) was the only risk factor associated with deltamethrin) and PCBs (18, 28, 52,101, 153, 138, and 180) were found
over-diagnosis of non severe pneumonia. Over-diagnosis of non severe in all the dairy product samples analysed. Milk samples were found to be
pneumonia in a busy clinic is significant and it tends to vary with age. the most contaminated with respect to the OCPs and the levels ranged
Changing the respiratory rates cut-offs to higher threshold reduced the between 0.0001μg/ml and 0.0407μg/ml. β-HCH was the highest OCP with
proportion of non-severe pneumonia mis-classification in infants. These concentration of 0.0407μg/ml while Cyfluthrin was the highest synthetic
findings have public health impact in managing these children as antibiotic pyrethroids recorded in yoghurt sample(0.0318μg/ml).The highest PCB 18
over-use accelerates high levels of resistance. More studies of the accuracy (2,2,5-Trichlorobiphenyl) recorded (0.2668μg/ml) in yoghurt samples. Data
and utility of respiratory rate as an indication for antibiotics are needed, obtained from the field regarding safe use of pesticides and symptoms
especially as vaccines against bacterial pneumonia are introduced to many among farmers was very high. The estimated dose for γ-chlordane(8.5x10-
resource poor countries. 5µg/ml), endrin(0.0114 µg/ml)p'p'-DDT(8.5x10-5µg/ml),DDE(8.5x10-5µg/
ml),heptachlor(2.8x105µg/ml),dieldrin(6.8x10-5µg/ml) do not pose a
564 direct hazard to human health, although present in milk samples since
the values were lower than toxic threshold as well as,reference,doses
MICROSCOPIC OBSERVATION DRUG SUSCEPTIBILITY (MODS): (γchlordane: 0.0005 µg/ml; endrin:0.20µg/ml; p'p'DDT:0.50 µg/ml;
A RAPID DIAGNOSIS OF PULMONARY TUBERCULOSIS IN DDE:0.50µg/ml; Heptachlor: 0.0001 µg/ml; and Dieldrin:0.005 µg/ml)
HIV/AIDS PATIENTS IN RESOURCE-SCARCE BOLIVIA and may indicate minimum risk to human. However, β-HCH(0.0375 µg/
ml), endosulfan(0.0142 µg/ml), methoxychlor(0.0746 µg/ml) and PCBs
Melissa Reimer-McAtee1, Meredith Lora2, Robert Gilman3, (0.0498 µg/ml) levels exceeded the reference doses of (β-HCH:0.003 µg/
Daniel Lozano Beltran4, Caryn Bern2, Monica Pajuelo5, Faustino ml, endosulfan:0.006 µg/ml, methoxychlor:0.005 µg/ml and PCBs:0.002
Torrico4 µg/ml) in children between the ages of 0-1 year, 1-11 years and adults
Tulane University, New Orleans, LA, United States, 2University of San indicating a great potential for systemic toxicity in all age groups especially
Francisco California, San Francisco, CA, United States, 3Johns Hopkins children who are considered to be the most vulnerable population
Bloomberg School of Public Health, Baltimore, MD, United States,
Universidad San Simon, Cochabamba, Plurinational State of Bolivia,
Universidad Peruano Cayetano Heredia, Lima, Peru
The need for fast, reliable diagnosis of Mycobacterium tuberculosis (Mtb)
infection is particularly acute in patients with HIV. This study examined the
rates of tuberculosis (TB) and multidrug-resistant tuberculosis (MDRTB)
in HIV patients in Bolivia. It evaluated the Microscopic Observation Drug
Susceptibility rapid liquid culture (MODS) versus traditional Ziehl-Neelsen
staining (ZN) and Lowenstein Jensen culture (LJ), and assessed the value
of the string test and induced sputum in sputum-scarce individuals. The
presence of Mtb in sputum of 107 HIV-positive patients was evaluated by
566 faecal streptococci concentrations showed high spatial and seasonal
variations from one well to another. The physicochemical analysis showed
DESCRIPTIVE CHARACTERIZATION OF CHOLERA OUTBREAK that, in 52.17% of wells, water was acidic with various mineralization. The
CAUSED BY BREAK DOWN OF PUBLIC PIPE BORNE WATER, principal component analysis (PCA) pointed out that seasonality had less
OKE ALAAFIA COMMUNITY, OYO STATE SOUTHWESTERN influence on the majority of measured water parameters (pH, electrical
NIGERIA SEPTEMBER 2013 conductivity, total dissolved solids, and salinity) than the location of the
well water point. Human wastes from the traditional latrines system
Elizabeth B. Adedire1, Abass O. Gbolahan2, Ikeoluwapo O. extensively used in this area and animal manure might have contaminated
Ajayi3, Aishat B. Usman1, Olufunmilayo O. Fawole1 the wells.
Nigerian Field Epidemiology and Laboratory Training Program, FCT Abuja,
Nigeria, 2Ministry of Health, Ibadan, Oyo State, Nigeria, 3University of 568
Ibadan, Ibadan, Oyo State, Nigeria
Cholera is an acute illness with profuse watery diarrhea caused by Vibro
cholerae serotypes 01 or 0139. In Nigeria, frequent outbreaks do occur. POTENTIAL BENEFITS AND NEGATIVE IMPACTS ON THE
Effective interventions to control these outbreaks require the identification ENVIRONMENT, VECTOR-BORNE DISEASES AND FOOD
of the source and risk factors for infection. In August 2013, an outbreak SECURITY
of cholera occurred in Egbeda LGA. We investigated the outbreak to
Delenasaw Yewhalaw
determine its magnitude, source, possible risk factors and initiate control
measure. We reviewed cholera case-based line lists from health facilities, Jimma University, Jimma, Ethiopia
hospital records and conducted active case search for cases. We defined a To satisfy the growing demand for electricity, Ethiopia plans to increase its
suspected case as any resident of Egbeda, two years or above, with acute electricity production five-fold between 2010 and 2015, mainly through
watery diarrhoea with or without vomiting between 26th August and the construction of dams. A literature review shows that while dams can
10th September, 2013. We used structured questionnaire to collect data boost power and agricultural production, promote economic development
on demographic characteristics, clinical informations, and risk factors. Data and facilitate flood control, they can also lead to environmental, ecological
were analyzed with Epi-info software and Microsoft excel. Environmental and socioeconomic changes. Several case studies show that dams may
assessment of water sources, water sampling, latrine use and waste alter the composition and density of vectors and intermediate host
disposal methods. We collected and analyzed 5 stool samples as well as species, increase the incidence of malaria schistosomiasis and possibly
5 well water samples There were a total of 28 cases and 7 deaths case lymphatic filariasis and lead to eutrophication of reservoirs, soil erosion
fatality rate of 25%. Twenty seven (96.4% ) of cases were from Oke- and earthquakes. There is evidence that dams and commercial irrigation
alaafia community. Median age of cases 10.5yrs (range 2-65yrs); five of schemes can increase soil and water degradation, vulnerability to drought
the deaths occurred among children 0-5years;(71.4%). Seventeen of the and food insecurity in riverine and lacustrine areas downstream of dams.
cases were males (60.7%). Major sources of water were wells (38.5%), It appears that dams in Ethiopia are also vulnerable to high soil erosion
61.4% of respondents had no toilet facilities hence indiscriminate rates and earth quakes. Consequently, the current and proposed large-
defaecation was common. Open dumping was the commonest (80.8%) scale dam construction program in Ethiopia requires in-depth research to
waste disposal method. Vibrio cholerae 01 was isolated in 3 (60%) of stool improve our understanding of the unintended negative effects of projects
samples analyzed. The outbreak probably occurred as result of drinking and to guide the location, design and implementation of appropriate
water from contaminated sources of water such as wells following break preventive and remedial programs .
down of public pipe borne water. Chlorination of wells was done and we
conducted intensive health education of Community members on proper 569
storage and household water treatment.
Mercy J. Borbor-Cordova1, Anna M. Stewart Ibarra2, Cristina G.
Recalde3, Efrain F. Beltran4, Raul Mejia3
Escuela Superior Politechnica del Litoral, Guayaquil, Ecuador, 2Upstate
Moussa Djaouda1, Thomas Njiné2, Song Liang3, Daniel Ebang Medical University, Syracuse, NY, United States, 3Instituto Nacional de
Menye1, Bouba Gaké4, Serge Hubert Zébazé Togouet2, Moïse Meteorologia e Hidrologia, Guayaquil, Ecuador, 4Ministerio de Salud
Nola2 Publica, Machala, Ecuador
University of Maroua, Maroua, Cameroon, 2University of Yaoundé 1, Ecuador is facing new challenges related to climate change impacts in the
Yaoundé, Cameroon, 3University of Florida, Gainesville, FL, United States, human health sector, especially for emerging infectious diseases, such as
Centre Pasteur du Cameroun, Annexe de Garoua, Garoua, Cameroon dengue fever. Although the public health sector is investing substantially
Groundwater serves as a major source of drinking water in North in measures of surveillance and mosquito control, the effects of climate
Cameroon. Water quality is an important determinant of human health, variability and change are not considered in the current strategies for
considering in particular waterborne diseases in local communities. This reducing dengue virus transmission. Effective planning for adaptation
study aimed at assessing the bacteriological quality and potential sources measures in the public health sector would require the following: a)
of well water contamination in Garoua, a metropolis of North Cameroon. a better understanding of climate and environmental interactions
The water quality of 23 wells was assessed through commonly used with the vector and disease transmission in which a monitoring and
microbiological tests. Also analysed were physicochemical parameters surveillance climate-disease program is fundamental b) an evaluation
of the water. For each well, monthly sampling was performed during of the effectiveness of current policies and measures in reducing the
10 months; physical characteristics of sampling sites were documented vector disease including 'what if' analysis in projected scenarios, and
and potential sources of contamination were identified. Results showed finally c) building scientific capacity in research institutions and looking
that the abundance of heterotrophic aerobic and mesophilic bacteria for a permanent dialog with stakeholders and decision makers to discuss
(HAMB) and bacterial bio-indicators in well water in Garoua all exceeded the adaptation measures on the climate change impacts on infectious
the WHO's drinking water standards. Total coliforms were present in all diseases. With this perspective, a consortium of national and international
well water samples at high concentrations (5.0x102 to 4.8x104 CFU/100 institutions and local public health organizations is developing an
ml of water). The water harbours relatively high concentrations of faecal interdisciplinary research program on dengue transmission in the city of
coliforms (1.2x102 to 2.3x104 CFU/100 ml of water). Escherichia coli and Machala, Ecuador. This 3-year study will develop predictive models by
linking climate factors with local neighborhood social and environmental and in countries from the former Soviet Union. Many conditions can
conditions to predict when and where dengue outbreaks will occur in be associated with this multifactorial disease: parasitic diseases like CE
Machala, Ecuador. This study aims to link multi-scale climate phenomena and schistosomiasis, as well as TB, abscesses, cysts or the presence of
to neighborhood-level dengue risk, fundamentally changing how we think a membraneous web that obstructs the terminal portion of the inferior
about climate-disease dynamics. At the same time, an iterative process vena cava . Poverty, malnutrition, recurrent bacterial infections, and
of monitoring and evaluation of adaptation measures linked to decision filariasis have been suggested to be predisposing factors for inferior
making aids and tools is proposed for developing climate change policy in vena cava occlusion in developing countries , whereas myeloproliferative
the public health sector. neoplasms, abdominal cancer and oral contraceptives are associated
with this syndrome in developed countries. However, environmental toxic
570 causes are described in children and young adult living in rural areas:
particularly, pyrrolizidine alkaloids derivatives can cause the disease by
OCCUPATION-RELATED SELF REPORTED HEALTH PROBLEMS microscopically damaging the hepatic venular bed. We report a case of
AMONG SOLID WASTE HANDLERS IN A RAPIDLY a 25 year old male immigrant from a rural area of Morocco admitted to
URBANIZING COASTAL COMMUNITY IN GHANA our Hospital for ascites, mild cholestasis and abdominal pain in October
2013. All tests resulted negatives except quanti FERON gold test, so the
James-Paul Kretchy1, Flemming Konradsen2, Mawuli patient was unsuccessfully treated for TB for 2 months. The patient clinical
Dzodzomenyo3, Thilde Rheinlander4, Irene Ayi5, Julius Fobil3, conditions and LFT slowly worsened and after 2 inconclusive hepatic
Anders Dalsgaard6 biopsies , a third biopsy combined with ultrasound and CT scan findings
University of Ghana/University of Copenhagen, Accra, Ghana, 2University allowed the diagnosis of VOLD. All commonest causes of VOLD were ruled
of Copenhagen, Copenhagen, Denmark, 3University of Ghana School of out, therefore, a toxic cause due to pyrrolizidines alkaloid derivatives was
Public Health, Accra, Ghana, 4University of Copenhagen School of Global considered. The patient is currently on the wait list for liver orthotopic
Health, Copenhagen, Denmark, 5Noguchi Memorial Institute for Medical transplantation due to end-stage liver failure. This finding warrants more
Research, University of Ghana, Accra, Ghana, 6University of Copenhagen attention to the toxic environmental agents in developing countries , as
Faculty of Health and Medical Sciences, Copenhagen, Denmark they need to be considered in the differential diagnosis of liver failure also
This study applied a mixed method design to investigate exposure to in immigrants to Europe.
waste, use of personal protective gear, and self-reported health problems
among solid waste handlers in a semi-urban township of southern 572
Ghana. A total of 280 waste handlers were studied representing all types
of waste handling practices including sweepers, collectors, transporters SOCIAL AND ENVIRONMENTAL DETERMINANTS OF
and disposers of waste. Most waste handlers engaged in multiple of CHILDHOOD DIARRHEAL DISEASE IN MALAWI: A
these activities (69.3%). The most commonly reported health problems NATIONWIDE, HOUSEHOLD-LEVEL, GEOSPATIAL ANALYSIS
were bodily pains (56.4%), headache (38.6%), fever (35.7%), feelings of
physical discomfort (28.2%), and diarrhoea (11.4%). In-depth interviews
Leslie A. Arney1, Peter S. Larson2, Mark L. Wilson2
with 22 waste handlers also highlighted eye problems, stomach pains
William Davidson Institute, Ann Arbor, MI, United States, 2University of
and non-specific symptoms such as stress and tiredness as commonly Michigan School of Public Health, Ann Arbor, MI, United States
experienced. There was a correlation between exposure of bare body parts Diarrhea continues to be a leading cause of death among children under-
of waste handlers and disease, with a higher likelihood to report fever five in developing countries. Despite increased access to improved water
for those using bare hands during waste handling [odds ratio (OR) = 1.89 and sanitation in some settings, many areas of sub-Saharan Africa and
(95% C.I 1.37 - 2.56), p < 0.0001] and diarrhoea [OR = 6.25 (95% C.I Asia have been left behind. The complex and multifactorial nature of
4.17 - 10.00), p < 0.0001] compared with those who used protective gear. associations with childhood diarrheal disease complicate understanding
Interviews showed that waste handlers generally had basic knowledge of the more critical determinants of risk. We analyzed data from the 2010
about the disease preventive purpose of wearing personal protective Malawi Demographic and Health Survey to identify risk factors for diarrhea
measures. However, observations revealed that most waste handlers among Malawian children. A hierarchical logistic regression model and
did not use such measures consistently mainly due to discomforts, a GIS-based raster analysis using inverse distance weighted interpolation
impracticalities of wearing it in hot and humid conditions, and not being were used to evaluate the independent effects of sanitation on childhood
supplied with protective gear by employers or not being able to invest in it diarrheal prevalence, and to characterize the distribution of diarrheal
themselves. The study indicates that waste handlers experience a burden disease and its determinants across Malawi. Approximately one-quarter
of disease which may be consequences of their occupation. Our findings of all households reported at least one child under-five having diarrhea
stress that waste handlers in rapidly urbanizing areas need protection in the two weeks preceding the survey. Households with an average
against occupational diseases through the wearing of affordable and child age between 6-12 months had six times the odds of childhood
suitable protective gear. Waste companies and government institutions diarrhea when compared to households with an average child age less
employing a growing number of waste handlers should train waste than 5 months. While 79% of households had access to an improved
handlers in the proper use of protective gear, educate on how to protect water source, only 12% of households were using an improved sanitation
their health and to provide such protective gear. facility, with an additional 11% lacking access to any sanitation facility.
Households with no sanitation facility had 45% greater odds of childhood
571 diarrhea as compared to those with an improved and unshared sanitation
facility. In multivariable analyses, the significant effect of sanitation on
VENO-OCCLUSIVE LIVER DISEASE IN CHILDREN AND diarrhea prevalence remained after adjusting for child age and maternal
YOUNG ADULTS: AN EMERGING PROBLEM IN DEVELOPING education. This study calls renewed attention to the persistent, yet
COUNTRIES preventable, burden of diarrheal disease among children in Malawi and
reveals important District- and sub-District-level variation in the distribution
Maria Teresa Giordani1, Paolo Fabris1, Alessandro D'alessandro1, of determinants that could be used to inform the targeting of future
Francesco Paolo Russo2, Enrico Brunetti3, Francesca Rinaldi3, interventions.
Francesca Tamarozzi3, Annarosa Floreani2
San Bortolo Hospital, Vicenza, Italy, 2University of Padua, Padua, Italy,
University of Pavia, Pavia, Italy
Veno-occlusive liver disease (VOLD) is increasingly reported in young
people from developing countries, particularly in the Arabian peninsula
573 Verbal Development 88.90% (n<P50=56), Nonverbal Development 77.8%
(n<P50=49), Global Development 85.70% (n=<P50=54).The analysis of
PERVASIVE EXPOSURE TO FECAL CONTAMINATION IN LOW- variance of a factor for Global Neuropsychological Development Profile
INCOME NEIGHBORHOODS IN ACCRA, GHANA respect to the three communities was 0.211 for the Verbal Development
was 0.229 and Nonverbal Development was 0.248. In the present study
Jacqueline M. Hurd, Monique Hennink, Christine Moe, Claire we found a large number of children with less than p50 during different
Null, Katherine Robb, Habib Yakubu, Dorothy Peprah parameters of Neuropsychological Profile in other hand there was no
Emory University, Atlanta, GA, United States difference between groups regarding their Neuropsychological Profile
Globally, diarrhea contributes to about 800,000 fatalities in children under (Verbal and Non-Verbal Development )
five each year, and is a primary cause of mortality in developing countries.
Rapid urbanization in low-income countries has led to a growing 575
sanitation crisis. A need exists for more effective WASH interventions in
low-resource urban environments that can minimize the transmission of ASSESSMENT OF THE QUALITATIVE IMMUNE RESPONSE
feces and reduce the rate of diarrheal illnesses. Effective interventions INDUCED BY THE CYD TETRAVALENT DENGUE VACCINE IN
require evidence-based research that highlights risk behaviors and HUMAN VOLUNTEERS
perceptions of fecal contamination risk in people's daily lives. This study
Bruno Guy1, Mark Boaz2, Antony Byers3, Aure Saulnier1, Aravinda
examines the context of fecal contamination during daily activities among
de Silva4, Sandra R. Henein4, Ralph Baric5, Scott R. Royal5, James
residents in low resource urban settings of Accra, Ghana. Qualitative
Crowe6, Nicholas Jackson7
data were collected through 16 focus group discussions to understand
the daily behaviors that place people at risk of fecal contamination.
sanofi pasteur, Marcy l'Etoile, France, 2sanofi pasteur, Swiftwater, PA,
Data were collected and analyzed using a grounded theory approach to United States, 3sanofi pasteur, Orlando, FL, United States, 4University
develop a conceptual framework of the context of fecal contamination in of North Carolina School of Medicine, Chapel Hill, NC, United States,
low income neighborhoods of Accra. MaxQDA10 software was used for
University of North Carolina School of Public Health, Chapel Hill, NC,
data analysis. Results show that latrine use is low in these neighborhoods United States, 6Vanderbilt University Medical Center, Nashville, TN, United
leading to a range of alternative methods of fecal disposal that contribute States, 7sanofi pasteur, Lyon, France
to fecal contamination throughout neighborhoods. Feces were further Clinical efficacy observed against dengue virus (DENV) serotypes 1, 3 and
spread through refuse dumping, poor refuse collection systems, 4, but not DENV2 in the Phase 2b trial of the CYD tetravalent dengue
recreational activities, and occupational tasks of residents. These pathways vaccine candidate (CYD23; Clinicaltrials.gov NCT00842530), contrasted
of fecal contamination underscore the pervasiveness of risk for fecal with the similar levels of antibody neutralization levels observed for all
contamination throughout low-income urban neighborhoods, suggesting 4 serotypes in a Vero cell based PRNT50 assay. To further investigate this
the need for multi-pronged interventions that target multiple pathways of finding, we assessed the quality of the vaccine-induced antibodies. Sera
feces transmission. from a completed clinical trial (NCT 01134263) in volunteers who were
flavivirus-seronegative at baseline, were depleted using virus-coated beads,
574 and neutralization was assessed before and after depletion in a flow
cytometry-based assay using U937-DC SIGN+ cells. These showed that
NEUROPSYCHOLOGICAL PROFILE OF CHILDREN IN NATIVE in this naïve population CYD-TDV vaccination elicited mostly homotypic
COMMUNITIES EXPOSED TO MERCURY CONTAMINATION IN anti-DENV4 responses, while anti-DENV1, DENV2 and DENV3 responses
MADRE DE DIOS, PERU included a significant heterotypic component. Antibody epitopes were
then mapped in a few samples using recombinant DENVs displaying
J. Oscar Tarazona-La Torre, E. Terrazas-Nuñez, J. Antonio serotype-specific, E protein domain I/II hinge epitopes. Homotypic anti-
Grandez-Urbina, J. Gonzalo-Rodriguez, R. Pichardo-Rodriguez DENV4 responses were seen to be directed against the DI/II hinge, while
Ricardo Palma University, Lima, Peru anti-DENV3 was not. This serotype-specific quaternary epitope was
Recent studies show that an adequate neuropsychological profile present and recognized by human monoclonal antibodies (mAbs) on the
is associated to adequate levels of learning. For this reason we are corresponding CYD-1, 2 and 3 serotypes, while cross-reactive anti-rE DI-II
interested in knowing which cognitive profiles in pediatric populations or DIII mAbs recognized all 4 CYD serotypes. Potentially enhancing anti-
of native communities exposed to mercury contamination in Madre de prM responses were not dominant in vaccinees' sera in Western Blots,
Dios, which vulnerable to suffer neurocognitive deficiencies because and it was also observed from a FcγR+ CV1 cell-based assay (presented
there are located in areas of difficult access to education and present by Byers and others at this conference) that vaccine-induced anti-DENV2
deficiencies in their basic needs so we have as objective to determinate responses were not more enhancing than against the other serotypes. In
the Neuropsychological Profile of children in native communities exposed conclusion, our results suggest that despite the presence of key epitopes
to mercury contamination in Madre de Dios, Peru Transversal study of a on the vaccine viruses, qualitative differences exist between vaccine-
representative sample taken from the native communities Ese'eja (Palma induced responses against serotype 4 compared to the other 3 serotypes,
Real, Sonene, Inferno) of Madre de Dios, 64 children were evaluated although it will be necessary to confirm the results obtained here in a
regardless of gender, ages from 3 to 7 years old. For this evaluation larger number of sera. These results demonstrate nevertheless the interest
we used Neuropsychological Test Maturity, CUMANIN. Parametric of qualitatively assessing dengue vaccine immunogenicity and how it
Kormogorov-Smirnov test of a sample was applied in order to check relates to protection. Studies using post-vaccination sera from clinical trials
for a normal distribution in the study variables. Frequencies established in endemic areas are ongoing, and results are expected in the coming 2
variables, measures of central tendency and dispersion in qualitative months
variables were used. The test of variance analysis of factor was applied to
check for differences between the study groups. The children of Infierno
native community were 23,8%(n=15), Palma Real 47,6%(n= 30) and
Sonene 28,6% (n=18). The mean age was 5,11 +/- 1,38. The percentiles
about different parameters of Neuropsychological Profile of children
were inferior of the p50 in Psychomotor 69.50% (n<P50=44), Language
Articulatory 66.7%(n<P50=42), Expressive Language 71.40% (n<P50=45),
Comprehensive Language 98.4% (n<P50=62), Space structure 69.80%
(n<P50=44), Visopercepcion 69.80% (n<P50=44), Iconic Memory 34.9%
(n<P50=22), Rhythm 87.3% (n<P50=55), Attention 90.50% (n<P50=57),
576 577
Nicholas Jackson1, Mark Boaz2, Branda Hu2, Edith Langevin1,
Anthony Byers3, Ralph Baric4, Aravinda de Silva4, James Crowe5, Luis Angel Villar1, Gustavo H. Dayan2, Jose Luis Arredondo3,
Thomas Papa1, Dany De Grave2, Melanie Saville1, Jean Lang1, Maribel Rivera4, Rivaldo Cunha5, Carmen Deseda6, Humberto
Bruno Guy1 Reynales7, Jose Remes-Troche8, Maria Selma Neves Costa9, Javier
Sanofi Pasteur, Lyon, France, 2Sanofi Pasteur, Swiftwater, PA, United Morales10, Luiz Carlos Rey11, Reynaldo Dietze12, Kleber Giovanni
States, 3Sanofi Pasteur, Orlando, FL, United States, 4University of North Luz13, Gabriel Carrasquilla14, Enrique Rivas15, Maria Consuelo
Carolina School of Medicine, Chapel Hill, NC, United States, 5Vanderbilt Miranda16, Margarita Cortes16, Zambrano Betzana17, Edith
University Medical Center, Nashville, TN, United States Langevin18, Mark Boaz2, Nadia Tornieporth18, Melanie Saville18,
The first efficacy trial (CYD23; Clinicaltrials.gov NCT00842530) of the CYD Fernando Noriega2
vaccine showed clinical protection against dengue virus (DENV) serotypes
Clinical Epidemiology Unit, School of Medicine, Bucaramanga, Colombia,
1, 3, and 4, but not DENV2, while similar antibody neutralization levels
Sanofi Pasteur, Swiftwater, PA, United States, 3Instituto Nacional de
(Vero cell based PRNT50 assay) were observed for all four serotypes. Post Pediatria, Mexico City, Mexico, 4Organización para el Desarrollo y la
study investigations of this result included a broad array of analytical Investigación Salud en Honduras (ODISH), Tegucigalpa, Honduras,
and experimental methods in four areas: host, virus, vaccine vector,
Hospital Universitário/UFMS, Campo Grande, Brazil, 6Caribbean
and novel immunological assays. Antigenic diversity between parental Travel Medicine Clinic, San Juan, Puerto Rico, 7Centro de Atención en
vaccine virus and wild-type CYD23 isolates does not impact neutralization Investigación Médica, Bogota, Colombia, 8Instituto de Investigaciones
(PRNT50) using serum from either CYD23 vaccinees or placebo recipients, Médico – Biológicas, Veracruz, Mexico, 9Hospital das Clínicas da
and an assessment of viremia differences between serotypes in CYD23 Universidade Federal de Goiás, Goiania, Brazil, 10Clinical Research Puerto
clinical cases was inconclusive. Pre-existing immunity impacts vaccine Rico, Guayama, Puerto Rico, 11Federal University of Ceara, Fortaleza,
immunogenicity and exploratory analysis using logistic regression, suggests Brazil, 12Nucleo de Doenças Infecciosas/UFES, Vitória, Brazil, 13Instituto
a relationship between probability of disease and PRNT titers. Using CV1 de Medicina Tropical/UFRN, Vitoria, Brazil, 14Centro de Estudios de
cells transfected with FcγRIIa, preliminary studies with post-vaccination Investigación en Salud (CEIS), Bogota, Colombia, 15Sanofi Pasteur, Mexico
sera from baseline-naïve subjects show no evidence of differential City, Mexico, 16Sanofi Pasteur, Bogota, Colombia, 17Sanofi Pasteur,
neutralization. Serotype-specific antibody depletion studies, and studies Montevideo, Uruguay, 18Sanofi Pasteur, Lyon, France
using recombinant DENVs displaying serotype-specific E protein domain I/ In a phase III study of the efficacy of the recombinant, live, attenuated,
II hinge epitopes show qualitative differences between serotype-specific CYD tetravalent dengue vaccine (TDV) against virologically-confirmed
neutralizing responses, while a Vero-cell based microneutralization assay dengue fever in dengue-endemic areas of five Latin American countries:
shows certain discrimination between serotypes. Analyses using serotype- Brazil, Colombia, Honduras, Mexico, and Puerto Rico (N=20 875).
specific monoclonals show that important E protein DI/II hinge region Children and adolescents aged 9-16 were randomized 2:1 to receive 3
epitopes are displayed on the vaccine viruses, including CYD2. Finally, prior injections of CYD-TDV or placebo at study months 0, 6 and 12. Safety and
clinical data suggest a relationship between vaccine potency (CCID50) immunogenicity were assessed as secondary objectives. Serious adverse
and neutralization, as well as in vivo competition between serotypes in events (SAEs) occurring at any time throughout the study in the whole
different formulations, and no differences in IFNγ responses between study population were documented, and reactogencity was described in
serotypes. Additional investigations, including Phase 3 efficacy study data a representative subset of 2000 children (300-600 per country) who were
anticipated in the second half of 2014, will deepen our understanding of randomly selected from among those enrolled during the first months
the results observed in this Phase IIb efficacy trial. of the study. SAEs were reviewed by an independent data monitoring
committee. Reactogenicity data included solicited injection site reactions,
solicited systemic reactions, and unsolicited adverse events, respectively
collected for 7, 14, and 28 days after each vaccination. Immunogenicity
was also assessed in this subset of 2000 children using Vero cell-based
PRNT50 assays against the four dengue serotypes to test serum collected
at enrolment, on D28 after the 2nd and 3rd injections, and at 13
months after the 3rd vaccination. Results of these analyses are expected
in September/October and will be presented here for the first time.
ClinicalTrials.gov: NCT01374516
578 579
Gustavo H. Dayan1, Luis Angel Villar2, Jose Luis Arredondo3, Stephen Whitehead1, Dan Elwood2, Cecilia Tibery2, Catherine
Maribel Rivera4, Rivaldo Cunha5, Carmen Deseda6, Humberto Larsson3, Adrienne Jarvis3, Beulah Sabundayo2, Matthew Jo2,
Reynales7, Jose Remes-Troche8, Maria Selma Neves Costa9, Javier Janece Lovchik2, Marya Carmolli3, Ben McElvany3, Cassandra
Morales10, Luiz Carlos Rey11, Reynaldo Dietze12, Kleber Giovanni Ventrone3, Catherine Luke1, Kristen Pierce3, Beth Kirkpatrick3,
Luz13, Gabriel Carrasquilla14, Enrique Rivas15, Maria Consuelo Anna Durbin2
Miranda16, Margarita Cortes16, Betzana Zambrano17, Edith 1
Laboratory of Infectious Diseases, National Institute of Allergy
Langevin18, Mark Boaz1, Nadia Tornieporth18, Melanie Saville18, and Infectious Diseases, Bethesda, MD, United States, 2Center for
Fernando Noriega1 Immunization Research, Johns Hopkins Bloomberg School of Public
Sanofi Pasteur, Swiftwater, PA, United States, 2Clinical Epidemiology Health, Baltimore, MD, United States, 3Vaccine Testing Center, College of
Unit, School of Medicine, Bucaramanga, Colombia, 3Instituto Nacional Medicine, The University of Vermont, Burlington, VT, United States
de Pediatria, Mexico City, Mexico, 4Organización para el Desarrollo y Dengue virus remains a public health burden in many tropical and
la Investigación Salud en Honduras, Tegucigalpa, Honduras, 5Hospital subtropical areas of the world. The lack of a vaccine or antiviral therapy
Universitário/UFMS, Campo Grande, Puerto Rico, 6Caribbean Travel and the relative unsustainability of vector control together contribute
Medicine Clinic, San Juan, Puerto Rico, 7Centro de Atención en to the ongoing emergence of dengue disease. The last decade has
Investigación Médica, Bogota, Colombia, 8Instituto de Investigaciones seen an increase in vaccine development efforts, with live attenuated
Médico – Biológicas, Veracruz, Mexico, 9Hospital das Clínicas da vaccines making significant progress. Our laboratory at the NIAID has
Universidade Federal de Goiás, Goiania, Brazil, 10Clinical Research Puerto developed live attenuated dengue vaccine candidates shown to be both
Rico, Guayama, Puerto Rico, 11Federal University of Ceara, Fortaleza, safe and immunogenic in monovalent and tetravalent studies in humans.
Brazil, 12Nucleo de Doenças Infecciosas/UFES, Vitoria, Brazil, 13Instituto These studies have enabled the down-selection of vaccine candidates
de Medicina Tropical/UFRN, Vitoria, Brazil, 14Centro de Estudios de to an optimal mixture of rDEN1Δ30, rDEN2/4Δ30, rDEN3Δ30/31, and
Investigación en Salud, Bogota, Colombia, 15Sanofi Pasteur, Mexico City, rDEN4Δ30. In admixture TV003, each component is delivered at a potency
Mexico, 16Sanofi Pasteur, Bogota, Colombia, 17Sanofi Pasteur, Montevideo, of 1000 PFU and neutralizing antibody data collected 90 days post-
Uruguay, 18Sanofi Pasteur, Lyon, France vaccination in flavivirus-naïve adults showed seroconversion to DENV1,
The protective efficacy afforded by vaccination with the recombinant, live, DENV2, DENV3, and DENV4 in 92%, 76%, 97%, and 100% of vaccinees,
attenuated, CYD tetravalent dengue vaccine (TDV) against virologically- respectively, after a single subcutaneous dose. In this cohort, 74% of
confirmed dengue fever was evaluated in a phase III trial in dengue- vaccinees achieved a tetravalent antibody response. When the potency of
endemic areas of five Latin American countries: Brazil, Colombia, the DENV2 component of the vaccine was increased 10-fold in admixture
Honduras, Mexico, and Puerto Rico. (N=20 875). Children and adolescents TV005 and administered in the same manner as TV003, frequencies of
aged 9-16 were enrolled over a 9 month period, randomized 2:1 to seroconversion in vaccinees to the individual serotypes 1 - 4 reached a
receive 3 injections of CYD-TDV or placebo at study months 0, 6 and remarkable 92%, 97%, 97%, and 97%, respectively, after a single dose,
12, and were actively followed for febrile illness (temperature ≥38°C for with 90% of vaccinees achieving a tetravalent antibody response. In both
≥2days) until the 13th month after the 3rd injection; ie for 25 months studies, low level vaccine viremia was detected in 70 - 75% of vaccinees
after the 1st injection. The primary endpoint was efficacy against cases and mild asymptomatic vaccine-associated rash was observed in 55 - 68%
against symptomatic, virologically-confirmed dengue occurring at least of vaccinees. Following a second dose of vaccine given 180 days after the
28 days after the 3rd injection, regardless of severity or serotype. Efficacy first dose, vaccine viremia, rash, or boosts in neutralizing antibody titers
by serotype was evaluated as a secondary objective. Active surveillance were not observed in any vaccinee, indicating that sterilizing immunity
consisted of weekly contacts via phone or home visits to remind parents was elicited following the first dose. Importantly, the data suggest that
to consult the trial center or health care center in the event of febrile admixtures such as TV005 can be administered as a single dose. This is
illness, considered as a suspected dengue case. An acute sample was to unprecedented among dengue vaccines and has positive implications for
be collected within 5 days of fever onset, and a convalescent sample 7-14 vaccine safety, compliance, cost, and dose sparing.
days later. Virological confirmation was by dengue qRT-PCR or dengue
NS1 antigen ELISA and cases were subsequently serotyped by qRT-PCR. 580
Together with a second phase III efficacy study in >10000 children aged
2-14 in 5 Asian countries conducted in parallel with a similar protocol, this PHASE I CLINICAL TESTING OF A RECOMBINANT SUBUNIT
study will provide pivotal data on the efficacy of the CYD-TDV vaccine in VACCINE FOR DENGUE
different populations and epidemiological settings. Results of our study
are expected in September/October and will be presented here for the first
Susan Manoff1, Michele Sausser1, Tyler Finn1, Amy Russell1,
Brynne Tannenbaum1, David Radley1, Donna Hyatt1, Christine
Roberts1, Andrew Bett2, Jason Martin1, Beth-Ann Coller1
Merck and Company, North Wales, PA, United States, 2Merck and
Company, West Point, PA, United States
A recombinant subunit vaccine is being developed to prevent disease
associated with dengue virus infection. The vaccine candidate comprises
truncated dengue envelope proteins (DEN-80E) from all four serotypes
produced in Drosophila S2 cells. The vaccine is being evaluated in a Phase
I clinical trial in 98 healthy, flavivirus-naïve, adults in Australia. The study is
a randomized, placebo-controlled, dose escalation study which evaluates
3 different dosage levels of the tetravalent DEN-80E. The formulations
evaluated include non-adjuvanted, aluminum hydroxide adjuvanted,
and two different dosage levels of ISCOMATRIX™ adjuvanted vaccine.
Volunteers received three doses of vaccine at a 0, 1, 2 month schedule.
Safety is being followed throughout the study and immunogenicity is
being assessed pre-dose, post-dose 1, post-dose 2, and 1, 6, and 12 Multicenter Study (GEMS) site in Nyanza Province, Kenya. An MSD
months post-dose 3. The primary endpoint for immunogenicity is based case was defined as a child with a diarrheal illness <7 days duration
on assessment of virus neutralizing antibody responses with analysis of comprising ≥3 loose stools in 24 hrs and ≥1 of the following: sunken
seroconversion and geometric mean titers. Subjects have now completed eyes, skin tenting, dysentery, IV rehydration, or hospitalization. Rotavirus
their follow-up through the primary endpoint (1 month post-dose 3) VP6 antigen was detected in stools by the ProSpecT ELISA rotavirus kit.
and the immunogenicity and safety data through this time point will be Demographic and clinical information were collected at enrollment and
presented. Subjects are continuing through the long term follow-up stage during a ~60-day follow-up visit. We used logistic regression to evaluate
of the protocol. factors associated with rotavirus among children with MSD compared with
non-rotavirus MSD. From January 31, 2008 to January 29, 2011, 1,476
581 cases were enrolled; rotavirus was detected in 217 (14.7%); among cases
aged 0-<6, 6-11, 12-23 and 24-59 months old, rotavirus was detected in
SAFETY AND IMMUNOGENICITY OF TAKEDA'S LIVE 24.0% (59/246), 18.3% (78/427), 15.6% (64/410) and 4.1 % (16/393),
ATTENUATED DENGUE VACCINE CANDIDATE IN A PHASE respectively. Compared to cases without rotavirus, cases with rotavirus
I STUDY CONDUCTED IN FLAVIVIRUS-NAÏVE HUMAN infection were more likely to: be 0-11 months old (65.6% vs. 44.7%,
VOLUNTEERS OR= 6.08, 95% confidence interval (CI) [3.80-9.72] ), be female (48.7%
vs. 41.4%, OR= 1.34, 95%CI [1.06-1.70]), and present with vomiting ≥3
Sarah George1, Aurelia Haller2, Claire Huang3, Mimi Wong4, Tina times/24hrs (69.9% vs. 45.1%, OR= 2.83 95%CI [2.19-3.65]), sunken
Dube4, Jorge Osorio2, Dan T. Stinchcomb2 eyes (97.1% vs. 92.2%, OR= 2.85 95%CI [1.45-5.59]), lethargy (18.7%
St. Louis University, St. Louis, MO, United States, 2Takeda Vaccines, Inc., vs.11.3%, OR= 1.80 95%CI [1.31-2.47]) and restlessness (72.7% vs.
Madison, WI, United States, 3Centers for Disease Control and Prevention, 58.2%, OR= 1.92 95%CI [1.47-2.49]). Among children with MSD,
Fort Collins, CO, United States, 4EMMES Corporation, Rockville, MD, rotavirus was more prevalent among infants and significantly associated
United States with severe diarrheal illness in our study setting. Our findings support the
We conducted a phase I, randomized, double-blind dose-escalation study Kenya Ministry of Health plan to introduce rotavirus vaccine.
of two different formulations of Takeda's live attenuated dengue vaccine
candidate in 72 healthy flavivirus-naïve adults at the Saint Louis University 583
VTEU (NCT01110551). Volunteers received two doses of the tetravalent
dengue vaccine candidate 90 days apart and were followed for safety THE THRESHOLD OF ROTAVIRUS SPECIFIC PLASMA IGA AS A
and immunogenicity. Serum samples were collected after each dose to CORRELATE OF PROTECTION FROM ROTAVIRUS DIARRHEA
measure vaccine virus replication by qRT-PCR and virus isolation and to IS AGE DEPENDENT
measure neutralizing antibodies to wild-type DENV. In this phase 1 study,
Marya P. Carmolli1, Beth D. Kirkpatrick1, Rashidul Haque2, K.
the vaccine was well-tolerated and no serious vaccine-associated adverse
Zaman2, Josyf C. Mychaleckyj3, Taufiqur R. Bhuiyan2, Dorothy M.
events occurred. Low levels of vaccine viral RNA were detected after
Dickson1, Elizabeth R. Colgate1, Uma Nayak3, Sean Diehl1, M.
prime in 46% of individuals that received the lower dose formulation and
Hossain2, S. Islam2, M. I. Uddin2, Firdausi Qadri2, William A. Petri3
in 79% of individuals that received the higher dose formulation. Both
vaccine formulations induced seroconversion rates of 67-100% to each
University of Vermont, Burlington, VT, United States, 2International
of the 4 serotypes of DENV, and more than 90% of subjects who received Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh,
two doses of the high dose formulation seroconverted to three or more
University of Virginia, Charlottesville, VA, United States
DENV (trivalent response). In summary, these findings highlight the good Optimizing and interpreting immunogenicity data and correlates of
tolerability and immunogenicity of Takeda's live attenuated dengue vaccine protection may help to better identify children in whom rotavirus
in flavivirus-naïve healthy volunteers and support further development and vaccination is failing in developing countries. Here we use the PROVIDE
clinical testing of the candidate dengue vaccine. study to examine the ability of rotavirus specific plasma IgA to correlate
with protection from future episodes of rotavirus diarrhea within the first
582 year of life. At the icddr,b site in Mirpur, Dhaka, 700 children were enrolled
at birth and followed for 24 months. Bi-weekly surveillance for diarrhea
BURDEN, RISK FACTORS AND CHARACTERIZATION OF was performed and diarrheal specimens were evaluated for rotavirus by
ROTAVIRUS AMONG CHILDREN WITH MODERATE-TO- enzyme-linked immunoabsorbent assay (ELISA). Diarrheal disease severity
SEVERE DIARRHEA IN RURAL WESTERN KENYA−2008-2011: was measured by a modified Vesikari-Ruuska score, with score ≥11
THE GLOBAL ENTERIC MULTICENTER STUDY (GEMS) indicating severe diarrhea. Rotavirus plasma IgA was detected by ELISA at
weeks 6, 18, and 24. Per published standards, children were considered
Richard Omore1, Jacqueline E. Tate2, Ciara E. O'Reilly2, John seropositive if the plasma IgA was ≥20 U/ml. Five percent of children were
Williamson3, Tracy Ayers2, Fenny Moke1, Benjamin J. Ochieng1, seropositive at week 6 with a Geometric Mean Titer (GMT) of 1.5 (66.5 for
Joseph Oundo3, Michele B. Parsons2, Cheryl A. Bopp2, Tamer H. seropositive). Irrespective of rotavirus vaccination status, at weeks 18 and
Farag4, Karen L. Kotloff4, James P. Nataro5, Sandra Panchalingam4, 24, 26% and 37% of the children were seropositive with a GMT of 7.1
Myron M. Levine4, John Vulule1, Kayla F. Laserson6, Pekka J. and 12.3 (114.1, 139.4 for seropositive) respectively. Seropositivity at 18
Nuorti7, Eric D. Mintz2, Robert F. Breiman8 and 24 weeks of age was correlated with up to 85% and 87% protection
Kenya Medical Research Institute/Centers for Disease Control and from future episodes of rotavirus diarrhea, respectively. At six weeks,
Prevention, Kisumu, Kenya, 2Centers for Disease Control and Prevention, seropositivity as previously defined was not associated with protection
Atlanta, GA, United States, 3Centers for Disease Control and Prevention, against future episodes of diarrhea. Increasing the cut-off to 40 U/ml at
Nairobi, Kenya, 4University of Maryland, Center for Vaccine Development, six weeks increased the proportion protected to 86% however the sample
Baltimore, MD, United States, 5University of Virginia School of Medicine, size was small. Our data show that regardless of natural exposure or
Charlottesville, VA, United States, 6India Epidemic Intelligence Service vaccine-induced responses, rotavirus specific plasma IgA levels at ≥20 U/
Programme, Centers for Disease Control and Prevention, Delhi, India, mL at weeks 18 and 24 serves as a correlate of protection from rotavirus
University of Tampere School of Health Sciences, Tampere, Finland, diarrhea in the first year of life. If measured at 6 weeks of age, higher IgA
Global Health Institute, Emory University, Atlanta, GA, United States levels are needed to indicate protection from future episodes of rotavirus
Rotavirus is the most common cause of severe diarrhea among children diarrhea. After unmasking, analysis will assess plasma IgA as an effective
worldwide. Data on risk factors for morbidity are limited. We analyzed correlate of protection in rotavirus-vaccinated children.
data from children <5 years old seeking health care with moderate-
to-severe diarrhea (MSD) and enrolled as cases in the Global Enteric
584 585
Allison T. Walker1, Richard Omore2, Fenny Moke2, Benjamin
Ochieng2, Tamer Farag3, Dilruba Nasrin3, Sandra Panchalingam3, James A. Platts-Mills1, Benjamin J. McCormick2, Monica
James P. Nataro3, Karen L. Kotloff3, Myron M. Levine3, Xin McGrath2, Alexandre Havt3, Aldo A. Lima3, Ila F. Lima3, Tahmeed
Lu1, Joseph Oundo4, Michele B. Parsons1, Cheryl Bopp1, Kayla Ahmed4, Dinesh Mondal4, Rashidul Haque4, Sudhir Babji5, Dinesh
Laserson1, Eric Mintz1, Robert F. Breiman4, Ciara O'Reilly1 Hariraju5, Gagandeep Kang5, Bishnu Rajamajhi6, Ladaporn
Centers for Disease Control and Prevention, Atlanta, GA, United States, Bodhidatta6, Carl J. Mason6, Pablo P. Yori7, Mery Siguas Salas8,
Kenya Medical Research Institute/Centers for Disease Control and Margaret Kosek8, Shahida Qureshi9, Furqan Kabir9, Aneeta
Prevention, Kisumu, Kenya, 3Center for Vaccine Development, University of Hotwani9, Sadia Shakoor9, Anita K. Zaidi9, Amidou Samie10,
Maryland School of Medicine, Baltimore, MD, United States, 4Centers for Brenda Mufamadi10, Pascal Bessong10, Caroline Amour11, Jean
Disease Control and Prevention-Kenya, Kisumu, Kenya Gratz1, Dennis Lang2, Mark Miller2, Eric R. Houpt1
Diarrhea is a leading cause of childhood morbidity and mortality in sub-
University of Virginia, Charlottesville, VA, United States, 2Fogarty
Saharan Africa; one in ten child deaths in the first 5 years of life is due International Center, National Institutes of Health, Bethesda, MD, United
to diarrheal disease. We assessed pathogen-specific mortality following States, 3Clinical Research Unit and Institute of Biomedicine, Federal
an episode of moderate-to-severe diarrhea (MSD) in children enrolled University of Ceara, Fortaleza, Brazil, 4Division of Nutrition and Food
in the Global Enteric Multicenter Study in western Kenya. We recruited Security, International Centers for Diarrheal Disease Research, Matlab,
children <5 years old presenting to sentinel health facilities with MSD. At Bangladesh, 5Christian Medical College, Vellore, India, 6Armed Forces
enrollment each child was assessed clinically, and provided anthropometric Research Institute of Medical Sciences, Bangkok, Thailand, 7Bloomberg
data and a stool sample to identify enteropathogens. Survival status was School of Public Health, Johns Hopkins University, Baltimore, MD, United
determined at 60 days. We calculated unadjusted exact odds ratios (OR) States, 8Asociación Benéfica PRISMA, Iquitos, Peru, 9Aga Khan University,
and 95% confidence intervals (CI) using simple logistic regression models. Karachi, Pakistan, 10University of Venda, Thohoyandou, South Africa,
From 2008 to 2011, 1,476 children with MSD were enrolled; 52 (3.5%)
Haydom Lutheran Hospital, Haydom, United Republic of Tanzania
died. Nineteen (37%) children died at health facilities (7 at enrollment) Studies of diarrheal etiology in developing countries have historically
and 33 (63%) died at home. Case-fatality rates by age stratum were focused on children presenting with severe symptoms to health centers
4.5% (<12 months), 3.1% (12-23 months), and 2.3% (24-59 months). and thus best describe pathogens associated with severe diarrhea.
Pathogens associated with increased risk of case-fatality were Shigella However, the etiologies of community diarrhea may be different. MAL-ED
dysenteriae (OR: 7.2; CI: 1.3-27.8), non-typhoidal Salmonella (OR: 2.8; CI: is a multisite birth cohort study with intensive community surveillance for
1.0-6.6), typical enteropathogenic Escherichia coli (OR: 2.6; CI: 1.1-5.5), diarrhea as well as collection of monthly asymptomatic stool specimens
and enterotoxigenic E. coli producing heat-stable toxin (OR: 2.5; CI: 1.1- from eight sites in South America, Africa and Asia. A total of 7,068
5.2). Children who died were more likely to be underweight (weight-for- diarrheal and 22,599 non-diarrheal control specimens from 2,073 children
age z score < -2: OR 12.6; CI: 6.4-26.8), wasted (weight-for-length/height aged 0-24 months were comprehensively tested for a broad range of
z score < -2: OR 8.2; CI: 4.4-15.1), and stunted (length/height-for-age enteropathogens. In the first year of life, Campylobacter, rotavirus, ST-
z score < -2: OR 4.2; CI: 2.3-7.9) at enrollment. Malnutrition and four producing enterotoxigenic E.coli (ST-ETEC), Cryptosporidium and astrovirus
bacterial pathogens for which no vaccines are available were associated were associated with the highest burdens of diarrhea in descending order
with increased risk of mortality from MSD. In the near-term, optimizing of attributable fraction. In the second year of life, diarrhea attributable to
nutritional status and water, sanitation, and hygiene interventions are Shigella was more prominent while diarrhea attributable to Campylobacter
urgent priorities for childhood diarrheal mortality reduction in Kenya. decreased. There was substantial site-to-site variation, such that 6
distinct pathogens had the highest burden of diarrhea for at least one
combination of site and age. Cryptosporidium, rotavirus, ST-ETEC and
Shigella were associated with more severe diarrheal episodes. This study
reveals substantial heterogeneity in the pathogen-specific burden of
community diarrhea including an unexpectedly high burden of disease
associated with Campylobacter and astrovirus.
Sylvia Becker-Dreps1, M. Andrea Azcarate-Peril1, Samuel Vilchez2
University of North Carolina at Chapel Hill, Chapel Hill, NC, United States,
Universidad Nacional Autonoma de Nicaragua, Leon, Leon, Nicaragua
The gut microbiome, the collection of bacteria in the human
gastrointestinal tract, plays an important role in human health.
Understanding how the gut microbiome is affected by diarrhea episodes
may help explain alterations in intestinal function among children in low-
income settings. This study examined the gut microbiome of Nicaraguan
children during diarrhea episodes and while free of diarrhea for at least 2
months. 16S amplicon sequencing was performed to determine changes
in the gut bacterial microbiome during diarrhea episodes. Sequencing
data analysis was done using Qiime (Caporaso, 2010). Rarefaction analysis
and diversity estimates were carried out to compare the overall diversity
of microbiota in diarrheal versus healthy stools. Principal Coordinate
Analysis of amplicon sequences (Hamady, 2010) was used to compare 588
clustering by state (diarrheal vs. healthy). In all, 74 stools were provided
by 27 children who were enrolled in a one-year cohort study of diarrhea IMMUNOGENICITY IN MICE OF A CHOLERA CONJUGATE
etiologies. These children had a mean age of 21 months (range: 1 to VACCINE CONTAINING VIBRIO CHOLERAE O1 INABA
45 months), 49% were female, 63% were breastfed, and 10% had O-SPECIFIC POLYSACCHARIDE (OSP) AND A RECOMBINANT
received an antibiotic during the diarrhea episode. A total of 593,509 TETANUS TOXIN HEAVY CHAIN FRAGMENT
sequences (an average of 7,707 reads per sample) were assigned to
7,880 operational taxonomic units at ≥97% similarity, clustering into Richelle C. Charles1, Grace Eckhoff2, Meagan K. Bufano1, Peng
237 genera, 115 families, 54 orders, 28 classes, and 14 phyla. Diarrheal Xu3, Md. Murshid Alam1, Anuj Kalsy1, Yanan Yu1, Ying Wu-
and healthy stools had statistically significant differences (p<0.05) for the Freeman1, Tania Sultana1, Md. Rasheduzzaman Rashu1, Daniel
phyla Firmicutes, Bacteroidetes, and Actinobacteria. Also, as compared Leung1, Regina C. LaRocque1, Jason B. Harris1, Stephen B.
to healthy stools, diarrheal stools had a greater relative abundance of Calderwood1, Firdausi Qadri4, W. F. Vann5, Pavol Kováč3, Edward
the taxa Enterobacteriaceae (13.0% diarrheal vs. 7.9% healthy) and T. Ryan1
Streptophyta (9.4% vs. 3.3%), and a lower relative abundance of the taxa 1
Massachusetts General Hospital, Boston, MA, United States, 2Harvard
Ruminococcaceae (9.8% vs. 21.0 %) and Cyanobacteria YS2 (2.1% vs. Medical School, Boston, MA, United States, 3National Institute of Diabetes
9.7%). Phylogenetic diversity did not differ significantly between diarrheal and Digestive and Kidney Diseases, LBC, National Institutes of Health,
vs. healthy stools. Principal Coordinate Analysis showed clustering by state Bethesda, MD, United States, 4International Centre for Diarrhoeal Disease
(diarrheal vs. healthy samples) indicating an overall perturbation of the Research, Bangladesh, Dhaka, Bangladesh, 5CBER, Food and Drug
microbiota in diarrheal stools. Administration, Laboratory of Bacterial Toxins, Bethesda, MD, United
587 Immunity against cholera is serogroup-specific and serogroup specificity
MARKERS OF OPV FAILURE: INFLAMMATORY AND is determined by the O-specific polysaccharide (OSP) of Vibrio cholerae
lipopolysaccharide (LPS). Here, we describe a cholera conjugate vaccine
containing Inaba OSP from a well-characterized source strain isolated in
2007 from a patient with cholera in Bangladesh. The OSP was conjugated
Caitlin Naylor1, Rashidul Haque2, Jennie Ma1, Miao Lu1, Mami via its core oligosaccharide to a recombinant tetanus toxin heavy
Taniuchi1, Eric Houpt1, William Weldon3, Mark Pallansch3, Uma chain fragment (rTThc) using squaric acid chemistry. We administered
Nayak1, Beth Kirkpatrick4, William Petri1 the vaccine intramuscularly to mice in the presence and absence of
University of Virginia, Charlottesville, VA, United States, 2International immunoadjuvantative alum. We immunized mice at day 0, 21 and 42.
Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh, Immunization with OSP:TThc induced detectable anti-OSP IgG responses
Centers for Disease Control and Prevention, Atlanta, GA, United States, after one immunization. There was a trend toward higher immune
University of Vermont, Burlington, VT, United States responses in the presence of alum. Although vibriocidal responses were
detectable in mice receiving OSP:TThc, they were low-level compared
The oral polio vaccine (OPV) shows reduced immunogenicity in low
to what has historically been reported following oral whole-cell cholera
income countries; children often have lower antibody titers in response
immunization. OSP:TTHc induced memory B cell responses targeting OSP
to the vaccine, but the biological cause is unknown. We are measuring
as well as TT. Importantly, serum from mice immunized with OSP:TThc
OPV responses in infants in an urban slum of Dhaka, Bangladesh. While
and alum protected against lethal challenge in mice orally challenged
OPV2 had only a 1.2% failure rate, OPV1 and OPV3 failed in 6.5% and
with wild-type V. cholerae. These results suggest that a cholera conjugate
9.9% respectively as measured by serum neutralizing antibody responses
vaccine containing Inaba OSP can be highly immunogenic for inducing
at 18 weeks of age. We hypothesized that nonpolio enterovirus infection
anti-OSP responses and that such anti-OSP-based immunity can be
at the time of immunization could interfere with OPV. We found that
protective even in the absence of significant vibriocidal responses. These
the presence of a nonpolio enterovirus at the time of the 14 week
results suggest that OSP:TThc may warrant further development as a
immunization was associated with failure of OPV1 and OPV3 at 18 weeks
cholera conjugate vaccine.
(p=.005 & .003). We further hypothesized that nonpolio enterovirus
infection was interfering by inducing an innate antiviral response in the
gut that prevented OPV replication. In support of this, up to a quarter of
OPV failures were associated with the inability to culture OPV1 or OPV3 SALIVARY ANTIBODIES TO WB123 PROVIDE A NON-
virus from stool samples 24 hours after the first OPV dose at 6 weeks INVASIVE TOOL FOR ASSESSMENT OF ONGOING
of age (chi-square probability=.01 & .07). In addition to these analyses,
blood, stool, and urine samples from the children have been tested for
over 20 biomarkers of immunity, inflammation and nutritional status. We Joseph Kubofcik1, Abdallah Diallo2, Lamine Soumaoro2, Michel
performed univariate linear regression analyses to evaluate the association E. Coulibaly2, Yaya I. Coulibaly2, Thomas B. Nutman1
of each biomarker with vaccine performance using serum antibody titers. 1
Laboratory of Parasitic Diseases, Bethesda, MD, United States, 2NIAID-Mali
Markers of poor intestinal health reg1B and mannitol (p=.0002 & .044) ICER, Bamako, Mali
were negatively associated with vaccine performance. Serum ferritin and
Significant progress has been made toward the global goal to eliminate
IL-5 (p =.028 & .029) levels, markers of systemic inflammation, were also
lymphatic filariasis (LF) by 2020 though the tools for monitoring control
negatively associated with vaccine performance. Serum zinc concentration
success and certification of transmission interruption need to be refined
and WAZ at 18 weeks of age (p=.034 & .006) positively correlated with
further. WHO guidelines for transmission assessment surveys (TAS) will
increased antibody titers. These results indicate that competing nonpolio
guide decisions about stopping mass drug administration (MDA); the
enterovirus infections and a chronic inflammatory response likely serve to
tools for post MDA surveillance, however, are likely to involve antibody
hinder initial OPV replication and the ability to elicit an effective immune
testing --likely based on antibodies to Wb123, a Wuchereria bancrofti
response. Further support for this hypothesis was obtained by measuring
(Wb)-specific antigen that is expressed early in parasite development and
fecal excretion of vaccine virus after the final OPV dose as a measure of
has been shown to be a sensitive and specific marker of exposure to Wb
mucosal immunity. We found that high levels IL-5 positively trended with
infective stage larvae (L3). Although serum/plasma based IgG4 anti-W123
increased virus excretion (p = .065). We concluded that the majority of
testing has already proved useful in assessing prevalences in target (6-7
the children in the cohort exhibited high levels of inflammatory markers,
year olds) populations, and a rapid diagnostic test (RTD) for these same
resulting in an enteric environment of chronic inflammation and infection
IgG4 anti-Wb123 antibodies is currently under development for use with
that left little room for an OPV response.
whole blood, both require at a minimum a finger prick. To development a
non-invasive methodology for the measurement of antibodies to Wb123, 591
a commercially available salivary collection device was used to collect saliva
from a group of 321 6-7 year olds from 5 villages in Mali 3 years after INTEGRATED MAPPING OF LYMPHATIC FILARIASIS AND
cessation of 7 annual rounds of MDA with albendazole and ivermectin. At PODOCONIOSIS IN ETHIOPIA: RESULT OBTAINED FROM A
the same time, dried blood spots were collected for antibody elution and NATIONWIDE SURVEY
whole blood was used for measurement of circulating filarial antigen by
ICT. Prevalences of serum IgG4 anti-Wb123 was performed by ELISA and Heven Sime Firew1, Ashenafi Assefa Bahita1, Kalkidan Mekete
compared to salivary IgG and IgG4 anti-Wb123 performed by luciferase Begashaw1, Abeba Reda1, Gemechu Tadesse Leta1, Amha Kebede
immunoprecipitation assay systems (LIPS). While the prevalence of CFA Hailemikael1, Asrat Hailu Mekuria2, Kebede Deribe Kassaye3,
was 4.5% (16/321) and for IgG4 serum anti-Wb123 from dried blood Simon Brooker4, Gail Davey3, Moses Bockarie5, Maria Rebollo Polo5
spots was 4.0% (13/321), the salivary antibody prevalences were higher 1
Ethiopian Public Health Institute, Addis Ababa, Ethiopia, 2Addis Ababa
with IgG anti-Wb123 being 8.4% (27/321) and for the more specific University Faculty of Medicine, Addis Ababa, Ethiopia, 3BSMS, London,
IgG4 anti-Wb123 being 6.5% (21/321). Our data suggest that saliva is a United Kingdom, 4London School of Hygiene & Tropical Medicine, London,
rich source of specific antibody to Wb123 and may provide a convenient, United Kingdom, 5Liverpool School of Tropical Medicine, London, United
sensitive and non-invasive alternative for antibody surveillance following Kingdom
cessation of MDA. Lymphatic Filariasis (LF) is endemic in Ethiopia, while efforts to eliminate
LF and management of podoconiosis are continuing; there is no complete
590 map that details the geographical distribution of LF and podoconiosis
in Ethiopia. The Federal Ministry of Health has recognized LF and
A COMPARISON OF TWO RAPID TESTS FOR DETECTING podoconiosis among priorities for control in the recent national master
FILARIAL ANTIGENEMIA IN LOW PREVALENCE SETTINGS IN plan for the control of NTDS, and indicated that a nationwide mapping
SRI LANKA is the loop-hole. Considering clinical similarities and both diseases have
the same target group for mapping the survey integrated the two
Thishan C. Yahathugoda1, Ramakrishna U. Rao2, Mirani V.
diseases. Thus, this survey aimed to generate a complete map of LF &
Weerasooriya1, Gary J. Weil2
podoconiosis distribution in Ethiopia. The study was conducted between
University of Ruhuna, Galle, Sri Lanka, 2Washington University School of
June to September 2013, based on WHO guideline for mapping of LF.
Medicine, St. Louis, MO, United States Equal number of male and female age ≥15 years were randomly selected.
Filarial antigen tests are useful for mapping the distribution of Wuchereria Data was collected using Smartphone and server was hosted by the
bancrofti infections and for detecting areas with persistent infections Task Force for Global Health. 100 µl of blood was collected from each
following mass drug administration (MDA). Prior studies have shown that consented/assented individual and tested for circulating W. banchrofti
the new AlereTM Filariasis Test Strip (Strip) has better analytical sensitivity antigen using Immunochromatographic tests (ICT).Differentiation between
than the BinaxNOW® Filariasis card test (Card), and the Strip detected LF and Podoconiosis was made by clinical examination, ICT result and
26% more positives than the Card in field studies performed in a highly Wb123 antibody tests. A total of 130116 individuals aged between 15
endemic area in Liberia. This study compared the performance of the Strip and 100 from 660 unmapped districts were participated on the survey.
and Card in 2 areas in Southern Sri Lanka with low level persistence of Demographic data showed 1:1 Female to Male ratio. More than half of
filariasis some 7 years following that country's intensive MDA program. the study participants (58.4%) were illiterate. 32.2%study participants
The study design called for testing ~400 people > 8 years of age in each reported bed net Utilization. ICT results confirmed the presence of W.
site (cluster sampling of households). Card and Strip tests were performed banchrofti antigen in 139 (0.1%) of the total study participants. Among
in parallel in the field with finger prick blood samples; test results were 313 (0.24%) of the study participant who showed the development of
scored at 10 and 30 min and at 12 hr. The Strip detected many more hydrocoel, only one participant tested positive by ICT for LF infection.
positives at 10 min than the Card (28/389 versus 13/390 in study site A 1.8%and 0.6%of the total participant report hematuria and chyluria
and 50/462 versus 13/462 in study site B). With one exception, all blood respectively. Lymphoedema was observed in 6083 (4.7%) of the total
samples positive by Card were also positive by Strip. Semi-quantitative participants, of which 5.9% was of upper limbs, 90.7% was of lower
test scores based on the intensity of "T" lines tended to be higher by Strip limbs, 3.5% was of breast. Of the total lymphoedema of lower limb, 5253
than by Card. Thus filarial antigenemia rates by Strip can be much higher was due to podoconiosis 20 was due to LF and the rest is due to various
than those by Card test in the post-MDA setting, when filarial antigen health problems. The current study revealed 76 districts with at least one
levels tend to be low, and this could affect the outcome of transmission ICT positive for the antigen of W. banchrofti. Districts with ≥1% of ICT
assessment surveys. It was not uncommon for Strips to turn from negative positive result, considered new endemic districts. The study also revealed
to positive between 10 and 30 min (5.6 % of samples tested), and this massive presence of Podoconosis. The available data will be a direct input
rarely occurred with the Card (0.36%). However, many Cards that were for the national and global control and elimination of LF and management
negative at 30 min were positive at 12 hr (14.3%), and this was less of Podoconiosis.
common with Strip tests (4.0%). These results underline the importance of
taking care to read filarial antigen test results at 10 minutes according to 592
the manufacturer's instructions. The improved sensitivity, lower cost, and
longer shelf life of the Test Strip favor its use over the Card test for filariasis CORRELATION BETWEEN HIGH LOA LOA MICROFILAREMIA
elimination programs. AND LEVELS OF CIRCULATING FILARIAL ANTIGENS USED TO
Sébastien Pion1, Céline Montavon1, Cédric J. Chesnais1, Joseph
Kamgno2, Samuel Wanji3, Michel Boussinesq1
Institut de recherche pour le Développement, Montpellier, France,
Center for Research on Filariasis and Other Tropical Diseases, Yaoundé,
Cameroon, 3Research Foundation in Tropical Diseases and the
Environment, Buea, Cameroon
The methods of choice to detect infection with Wuchereria bancrofti
are tests detecting circulating filarial antigens (CFA): the Og4C3 ELISA
and the field-friendly immunochromatographic card test (ICT) which has
been widely used to map lymphatic filariasis (LF) and assess the impact
of mass treatments. During a LF survey conducted in 26 villages in South 594
Cameroon (1805 individuals tested), we noted that none of those 52
subjects who had a positive ICT presented W. bancrofti microfilariae (mf) MONITORING TRANSMISSION OF WUCHERERIA BANCROFTI
in their night blood smear, whereas 91% had Loa loa mf. As blood smears POST-MDA IN GHANA
were also prepared by day for all the individuals, we could analyze the
association between ICT positivity and Loa microfilaremia. At village level, Irene Offei Owusu1, Dziedzom de Souza2, Charles Narh2,
the prevalence of ICT positivity was strongly correlated with the prevalence Michael David Wilson2, Daniel Boakye2, Francis Anto1, Moses
of diurnal Loa microfilaremia (r=0.61, p=0.001). Among the ICT-positive Bockarie3, John Gyapong1
subjects, 96% presented Loa mf by day (arithmetic mean: 36,977 mf/mL). 1
School of Public Health, University of Ghana, Legon, Accra, Ghana,
The association between ICT positivity and Loa mf density was assessed 2
Noguchi Memorial Institute for Medical Research, University of Ghana,
using multivariate logistic regression adjusting on individual characteristics Legon, Accra, Ghana, 3Liverpool School of Tropical Medicine, University of
(age, sex, Mansonella perstans mf density). Five groups were defined: one Liverpool, Liverpool, United Kingdom
including the amicrofilaremics (reference group) and four with increasing The WHO recommends using Transmission Assessment Surveys (TAS)
mf densities (divided into quartiles). Odds-ratios [95% confidence interval] as a primary tool for deciding when to stop Mass Drug Administration
associated with ICT positivity were 85 [18-294] and 315 [72-1373] in (MDA) and for post-MDA surveillance in lymphatic filariasis (LF) elimination
the two groups with the highest Loa microfilaremias (3061-12,120 mf/ programs. In Awutu Senya, Effutu, Agona East and West districts of
mL and >12,120 mf/mL). We also compared the results of Og4C3 ELISA Ghana, MDA was stopped in 2010 after 9 rounds, and TAS conducted.
tests, using dried blood spots, between ICT negative subjects with no Loa These areas have passed the TAS and thus the need for post-MDA
mf and ICT negatives with >20,000 Loa mf/mL. Optical density values surveillance to monitor recrudescence. The aim of this study is to monitor
obtained with samples from the latter group were higher than those transmission of Wuchereria bancrofti Post-MDA in Ghana using periodic
obtained in the former (mean 0.44 vs 0.25, p<0.001). Our results suggest surveys. Two surveys were conducted, school-based and household
that high Loa mf density may cause false positivity with CFA detection surveys. A xenomonitoring study was also undertaken alongside the
tests (in that case LF mapping based on ICT would have to be redone surveys using Indoor Residual Spraying (IRS) technique. A total of 1,708
in Loa-endemic areas) or is associated with amicrofilaremic W. bancrofti children (aged 6-10 years) from selected schools and 1,214 (aged 11-
infection. Antibody detection tests will be applied on our samples to 60 years) community members participated in the school-based and
resolve the issue. household surveys respectively. Daytime finger-prick blood samples were
collected from all consenting participants and tested using ICT kit and
593 OG4C3 (ELISA). Mosquitoes were captured from 324 households, and
LAMP assay performed to detect W. bancrofti parasites. Preliminary results
ELIMINATION OF ONCHOCERCIASIS IN AFRICA: DO WE HAVE show that prevalence of LF in humans is fairly stable [2010=0.13%,
STRATEGIES AND TOOLS? UGANDA CASE ANALYSIS 2012=0%, 2013=0.06%] among 6-10 year old children and the general
population [2010=1.17%, 2012=1.00%, 2013=0.08%]. A total of 3347
Thomson Luroni Lakwo1, Edridah Muheki Tukahebwa1, Peace
mosquitoes were captured; 2038 Anopheles spp. (2002 An. gambiae, 36
Habomugisha2, Ambrose Onapa3, Harriet Namwanje3, Ephraim
An. funestus), 1269 Culex spp., 33 Aedes spp. and 7 Mansonia spp. For
Tukesiga4, David Oguttu1, Rolf Garms5, Moses Katabarwa6, Stella
each community, Anopheles spp. were pooled with an average pool size
of 15. Forty-two (30%) out of 139 pools were found to be positive, (35
Vector Control Division, Ministry of Health Uganda, Kampala, Uganda, An. gambiae and 7 An. funestus). While the surveys in humans revealed
The Carter Center, Kampala, Uganda, 3RTI International, Kampala, very low prevalence of infection, xenomonitoring has proven to be much
Uganda, 4Kabarole District Local Government, Kabarole, Uganda, 5Bernard more sensitive showing a prevalence of 30% in known vectors, especially
Nocht Institute for Tropical Medicine, Hamburg, Germany, 6The Carter using the LAMP method in detecting the presence of W. bancrofti.
Center, Atlanta, GA, United States Information from this study will provide recommendations on mechanisms
Onchocerciasis is a neglected parasitic disease that infects at least 37 for monitoring transmission of LF post-MDA which can be scaled-up both
million people in Africa. The first major attempt to control onchocerciasis in Ghana and globally.
was launched in West Africa in 1974 with vector control as the only
strategy. However, the advent of Ivermectin (Mectizan®) in 1987, provided 595
opportunities for other endemic African countries to join the war against
onchocerciasis. Uganda has had a long history of onchocerciasis control FINANCIAL AND ECONOMIC COSTS FOR CONTROL,
and elimination dating back to the 1950s. Control of onchocerciasis using ELIMINATION AND ERADICATION OF RIVER BLINDNESS IN
annual mass treatment with Ivermectin started in 1992. However, annual AFRICA
treatments alone were not able to interrupt transmission of onchocerciasis
in some foci. The Ministry of Health adopted new strategies to address Young Eun Kim1, Elisa Sicuri2, Fabrizio Tediosi1
this challenge, hence the initiation of Simulium spp. vector control and 1
Swiss Tropical and Public Health Institute, Basel, Switzerland, 2CRESIB,
semi-annual treatments. New sensitive M&E tools have been developed Barcelona, Spain
to delineate areas where transmission has been interrupted. Impact Onchocerciasis, also known as river blindness, has been a serious public
assessments conducted in 2004 revealed a reduction of microfilaria health problem in Africa; however, the transmission of the disease has
prevalence in most of the foci. Assessments were based on skin snip been suppressed with successful mass drug administration (MDA) with
surveys; serology (Ov16), pool screening of flies using PCR and crab ivermectin. Also, recent studies in Mali and Senegal proved the feasibility
collections and examinations for infestation with immature stages of the of elimination with ivermectin. These provided momentum for shifting
vector. Based on the results in 2007, an elimination policy was adopted in the goal from control to elimination along with the global movement
some foci. Since then, interruption of onchocerciasis transmission has been toward elimination of neglected tropical diseases. As part of an Eradication
achieved in a total of 7 foci, where the vectors have also been eliminated. Investment Case for onchocerciasis, financial and economic costs of
This translates to 1,354,390 treatments halted with more than 1.2 million alternative scenarios of control, elimination, and eradication are estimated
people living in areas where transmission has been interrupted. With a using a micro costing approach from a viewpoint of service providers
combination of strategies and available evaluation tools, Uganda has (i.e. ministries of health, WHO, and NGOs). The costs are estimated up
demonstrated that it is feasible to achieve onchocerciasis elimination in to 2045 considering regional elimination in Africa is predicted to be
Africa. achievable by 2040 employing a micro simulation model for onchocerciasis
transmission. Financial costs include costs for MDA and surveillance.
Economic costs measure the opportunity costs for community drug
distributors (volunteers) and donated drugs. Unit cost per person living the environment. Therefore, provision of water, sanitation and hygiene
in endemic area is estimated at $1.43 with all costs included and $0.11 (WASH) programs is of critical importance in the sustainable control of
with only financial costs. Financial cost of staying in control mode is STHs. "WASH for Worms" is a cluster randomised controlled trial assessing
estimated at $527 million over 2013-2045. Scaling up MDA coverage and the impact of a community-based WASH intervention, implemented
implementing regular surveillance to achieve elimination and eradication by WaterAid Australia, on infection with intestinal parasites following
would cost $440 million -$453 million, the savings being due to decrease mass albendazole (ALB) chemotherapy in villages in Timor-Leste. In this
in the number of required treatments as MDA is stopped with elimination trial, initiated in 2012, twelve intervention villages receive the WASH
achieved. Economic costs are estimated to be significantly higher than programme and ALB treatments every six months. Twelve control villages
financial costs, $6.3 billion for the control scenario and $3.1 billion - $3.3 receive only the six-monthly ALB. All villages are followed-up for two
billion for the scenarios of elimination and eradication over the same time years after the first ALB distribution. Infection prevalence and intensity
horizon. The results suggest scaling up MDA coverage and implementing is measured by a modified qPCR. The results for STH infection levels
regular surveillance to achieve elimination and eradication, after initial at baseline and after the first follow-up in the first 16 villages enrolled
resource-intensive efforts, would allow substantial financial and economic will be presented together with results of an anthelmintic efficacy trial
savings in the long term. using a single dose of ALB on STHs conducted in 8 villages. At baseline
the prevalence of STHs in the first eight villages was high, with more
596 than 90% of participants infected with at least one STH (assessed
by PCR) mostly comprising Necator americanus (75.3%) followed by
EXPLORING THE RELATIONSHIP BETWEEN ACCESS Ascaris lumbricoides (63.6%). At the first follow-up in 8 of the villages,
TO WATER, SANITATION AND HYGIENE AND SOIL- it was possible to detect an additional benefit of the WASH intervention
TRANSMITTED HELMINTH INFECTION: A DEMONSTRATION compared to deworming alone. This trial is the first reported RCT
OF TWO RECURSIVE PARTITIONING TOOLS evaluating the impact of integrated WASH and deworming programmes
on infection with STHs; and will provide essential evidence for scaling up
Katherine Gass1, David Addiss1, Matthew C. Freeman2 integrated programmes for STH control.
Task Force for Global Health, Decatur, GA, United States, 2Rollins School
of Public Health, Emory University, Atlanta, GA, United States 598
Soil-transmitted helminths (STH) - a class of parasites that affect billions
of people - can be mitigated using mass drug administration, though ASSOCIATION OF WATER QUALITY WITH SOIL-
reinfection following treatment occurs within a few months. Improvements TRANSMITTED HELMINTHIASIS, DIARRHEA AND INFLUENZA-
to water, sanitation and hygiene (WASH) likely provide sustained benefit, LIKE ILLNESS IN NUEVA SANTA ROSA, GUATEMALA -- 2010
but few rigorous studies have evaluated the specific WASH components
Almea Matanock1, Xin Lu1, Victoria M. Cuéllar1, Patricia Juliao1,
most influential in reducing infection. There is a need for alternative
Maricruz Alvarez2, Andrew Thornton1, Jaymin C. Patel1, Fredy
analytic approaches to help identify, characterize and further refine
Muñoz2, Gerard Lopez2, Lissette Reyes3, Wences Arvelo1, Beatriz
the WASH components that are most important to STH reinfection in
López2, Kimberly Lindblade1, Sharon L. Roy1
order to improve WASH interventions for control of STH. In this paper,
we introduce two recursive partitioning approaches: classification and
Centers for Disease Control and Prevention, Atlanta, GA, United States,
regression trees (C&RT) and conditional inference trees (CIT). Utilizing data
Universidad del Valle de Guatemala, Guatemala City, Guatemala, 3Área
from a school-based randomized control trial in Kenya, we conduct an de Salud de Santa Rosa, Ministerio de Salud Pública y Asistencia Social,
assessment of the school- and household-level WASH components and Cuilapa, Guatemala
demographic indicators that contribute to reinfection of pupils 10 months Improved water quality is essential in reducing diarrhea. Its impacts on
following deworming treatment. We show how C&RT and CIT can be influenza-like illness (ILI) and the soil-transmitted helminths (STH) Ascaris
used to identify the WASH components most predictive of and associated and Trichuris are less well described, though some data link them to water,
with STH infection. In addition, we demonstrate how both tools can be sanitation, and hygiene. To assess their association with water quality,
used to identify complex interactions between WASH indicators and sub- we conducted a cross-sectional survey in Nueva Santa Rosa, Guatemala
populations that may be particularly susceptible to STH reinfection, both among persons >1 year old in randomly selected households (HH). A stool
of which are difficult to identify using traditional epidemiological methods. sample was tested by Fecal Parasite Concentrator and Kato-Katz method
We discuss the relative merits and weaknesses of each approach and make for STH. Diarrhea and ILI were identified by self-reported symptoms in the
recommendations for their use as tools to enhance STH control programs. past week. We explored associations between Escherichia coli-positive
drinking water (water quality) and disease outcomes using exact logistic
597 regression models. Median unbiased estimates (MUE) are reported
when maximum likelihood estimates did not exist. We interviewed 920
IMPACT OF WASH AND ALBENDAZOLE DISTRIBUTION ON persons from 204 HH. Water results were available for 778 persons; 84%
INFECTION WITH SOIL-TRANSMITTED HELMINTHS IN TIMOR- (650/778) lived in HH with E. coli-positive water. Among persons in HH
LESTE: INITIAL RESULTS OF A CLUSTER RANDOMIZED TRIAL with water quality testing, 12.4% (76/611) tested positive for Ascaris and/
or Trichuris, 9.4% (73/778) had diarrhea, and 13.5% (105/778) had ILI.
Susana V. Nery1, Suzy Campbell1, Stacey Llewllyn2, Ross Univariable analysis showed an association between water quality and
Andrews3, Darren Gray4, Rebecca Traub5, James S. McCarthy2, STH (OR 8.9, CI 2.3–76.2), but not with diarrhea or ILI. There was no
Archie Clements6 difference in water treatment practices between HH with and without
The University of Queensland, Brisbane, Australia, 2Queensland Institute diarrhea to explain the lack of association between water quality and
of Medical Research, Brisbane, Australia, 3Charles Darwin University, diarrhea. In stratified analyses, E. coli-positive water remained associated
Darwin, Australia, 4Australian National University, Canberra, Australia, with STH among persons ≥15 years (MUE 13.4, CI 2.9–infinite) and those
University of Melbourne, Melbourne, Australia, 6The Australian National living in densely populated areas (≥1,000 persons/km2) (OR 15.1, CI
University, Brisbane, Australia 2.5–614.7). The lack of association between water quality and diarrhea
Soil-transmitted helminths (STH) infect more than two billion people was unexpected, as was the association between water quality and STH,
worldwide, causing considerable morbidity, including malnutrition and since STH has been viewed primarily as a sanitation and hygiene issue.
anaemia. STH infections are most prevalent in communities where Waterborne transmission and effects of water treatment on STH should be
adequate water and sanitation are lacking and hygiene behaviour is poor. investigated. If a causal relationship is found, practices such as household
Deworming programmes with anthelminthic drugs are highly effective in water treatment, might be useful adjuncts to sanitation, hygiene, and
reducing morbidity but rapid reinfection occurs if there is no change in deworming in STH control programs.
599 Ethiopia access to improved sanitation facilities (facilities) at age 1 yr was
associated with decreased odds of stunting at 1 yr, 5 yrs and 8 yrs (OR:
IMPROVEMENT OF WATER, SANITATION AND HYGIENE IN 0.59, 0.63, 0.64; p<0.05). In India and Peru, access to improved facilities
TWO URBAN SLUMS IN UGANDA THROUGH COMMUNITY at 1 yr was significantly associated with stunting at age 5 yrs only (OR:
PROACTIVE AND SUSTAINABLE INTERVENTIONS 0.61, 0.75, p<0.05). Improved facilities access when children were 5 yrs
old was associated with stunting only at age 5 in Peru (OR: 0.71; p<0.05)
Rawlance Ndejjo1, David Musoke1, David Carpenter2, Simon and age 8 in Vietnam (OR: 0.64; p<0.05). Improved facilities at age 8 was
Kasasa1, William Bazeyo1, John C. Ssempebwa1 not associated with stunting at age 8 in any country. Improved drinking
Makerere University School of Public Health, Kampala, Uganda, water at 1 yr was significantly associated with underweight at age 8 in
University at Albany, New York, New York, NY, United States India (OR: 0.52; p<0.05); for all other time points and countries, improved
In urban slum settlements in Uganda, the major risk factor for water drinking water was not significantly associated with underweight. Facilities
borne diseases such as diarrhea is contaminated drinking water due to quality at age 1 yr was associated with lower odds of being underweight
poor latrine status, low safe water coverage, and poor domestic and in Peru at 1 yr (OR: 0.59, p<0.05) and in India at age 5 yrs (OR: 0.60,
personal hygiene practices. To address the challenges affecting these areas, p<0.05). There were no other significant associations between facilities
a project aimed at improving the water, sanitation and hygiene (WASH) and underweight. The combination of significant associations with quality
status in 2 urban slum communities in Uganda through community of sanitation facilities and reduced undernutrition and the numerous
proactive and sustainable interventions was implemented. The 2 slums insignificant associations suggest the importance of further investigating
involved were in Kampala and Mukono in the central region of the mediating factors that affect whether interventions to improve sanitation
country. To establish the WASH status of the communities before project reduce concurrent and long-term child malnutrition.
implementation, a baseline survey was carried out among 213 households.
The survey involved both quantitative and qualitative methods. Several 601
interventions with full community participation were then implemented to
improve the situation. The interventions included: community sensitization INTEGRATING WATER TREATMENT INTO ANTENATAL CARE:
on WASH, promotion of hand washing using the tippy tap technology, IMPACT ON USE OF MATERNAL HEALTH SERVICES AND
supporting clean-up exercises in the community, providing advisory roles HOUSEHOLD WATER TREATMENT AMONG MOTHERS --
in WASH, supporting health clubs in primary schools, training community UGANDA, 2013
members in a short course in WASH, capacity building of youth in WASH,
Almea Matanock1, Tara Anderson1, Miriam Mutabazi2, Lilian
promoting drinking safe water through household chlorination and home
Likicho2, Thomas Emeetai2, Celia Kakande2, Xin Lu1, Tracy Ayers1,
improvement campaigns. After the project implementation period, a final
Robert Quick1
evaluation survey was carried out among 300 households. This survey
involved both quantitative and qualitative data collection methods. Latrine Centers for Disease Control and Prevention, Atlanta, GA, United States,
coverage improved from 86.0% to 98.7%. Piped water usage improved Management Sciences for Health, STRIDES for Family Health, Kampala,
from 38.0% to 86.0% with a reduction in the use of unprotected sources Uganda
from 30.0% to 2.3%. Treatment of drinking water improved from 95.3% In Uganda, high maternal and neonatal mortality rates reflect
to 99.7% with more households (96.0%) boiling their water from 94.0% underutilization of reproductive health services; high diarrhea risk among
who did so at the baseline. Indiscriminate disposal of solid waste reduced children results from poor access to safe water. To incentivize household
from 18.0% to 2.0% and satisfaction with solid waste management water treatment and reproductive health service use, water treatment kits
services increased from 40.0 to 91.8%. Drainage around homes improved (buckets and 30 sachets of flocculant-disinfectant powder) were provided
from 57.0% to 86.0% while presence of soak pits at households increased at first antenatal visits. Refills of 30 sachets each were distributed at
from 2.3% to 10.0%. Improvements in the latrine statuses, environmental follow-up antenatal (ANC) visits, health facility deliveries, and postnatal
hygiene and waste management practices were also registered. There check-ups. We evaluated this intervention through cross-sectional surveys
were significant improvements in the WASH status of these communities of a random sample of women from participating health facilities who
after the implementation of several multi-faceted interventions. Urban received reproductive health care in 2013 after project launch (intervention
slums can benefit from WASH interventions when communities are fully group) and in 2012 before project launch (pre-intervention/comparison
involved and with a focus on capacity building. group). We used the Chi-Square test statistic to compare groups. We
surveyed 226 intervention group women and 207 comparison group
600 women. A higher percentage of intervention than comparison group
women reported treating drinking water on the day of the survey (31.7
SOME CHILDREN WITH ACCESS TO IMPROVED WATER AND vs 19.7%, P=0.01), and had detectable chlorine residual, an objective
SANITATION DEMONSTRATE BETTER GROWTH: FINDINGS measure of treatment, in their stored drinking water (13.5% vs 3.4%,
FROM THE YOUNG LIVES COHORT STUDY IN ETHIOPIA, P<0.01). Of 226 intervention group women, 222 (98.2%) received water
INDIA, PERU AND VIETNAM treatment kits. Although 96.8% of intervention group women had ≥2
ANC visits (median 4 visits, range 1-5), only 101 (45.5%) received one
Debbie Humphries1, Kirk A. Dearden2, Whitney Schott3, or more sachet refills. There was no difference in the percentage of
Benjamin Crookston4, Mary E. Penny5, Jere Behrman3 women in intervention and comparison groups that reported ≥4 ANC
Yale School of Public Health, New Haven, CT, United States, 2Boston visits (66.2 vs 68.5%, P=0.61) or health facility deliveries (67.8 vs 74.3,
University School of Public Health, Boston, MA, United States, 3University P=0.14). Intervention group women were more likely than comparison
of Pennsylvania, Philadelphia, PA, United States, 4Brigham Young group women to treat their drinking water, but had similar low use of
University, Provo, UT, United States, 5Instituto de Investigacion Nutricional, reproductive health services. Although water treatment kit coverage at first
Lima, Peru antenatal visit was high, inadequate distribution of, or low demand for,
Child undernutrition is widespread in developing countries and is perceived refill sachets may have contributed to limited program impact.
to have large costs over the lifecycle. We used data on 8,062 children from
Ethiopia, India, Peru and Vietnam at ages 1, 5, and 8 yrs from the Young
Lives cohort to estimate multivariate logit regressions for associations
between household and community-level access to improved water and
sanitation, and stunting and underweight at these three ages. Improved
drinking water was associated with stunting only in Peru, where access at
age 5 yrs decreased risks of stunting at age 5 yrs (OR: 0.68; p<0.05). In
602 IFN-y, IL-2 and TNF-a by CD4+ and CD8+ T cells. The fine specificity of the
cellular immune responses induced by immunization with the chimeric P.
IMPACT OF A SCHOOL-BASED WATER, SANITATION vivax CSP will be discussed.
Victoria Trinies, Anna Chard, Howard Chang, Matthew Freeman BLOOD CELLS USING ANTI-DUFFY BINDING PROTEIN
Emory University, Atlanta, GA, United States ANTIBODIES
School-based water, sanitation and hygiene (WASH) programs can lead Brenden P. Jenks1, D'Arbra Blankenship1, Vincent R. Gerbasi2, G.
to improvements on pupil health and attendance, but few rigorous Christian Baldeviano2, Christopher L. King1, Andres G. Lescano2,
studies are available. We conducted a quasi-experimental, longitudinal Brian T. Grimberg1
impact evaluation of a comprehensive school-based WASH program
Case Western Reserve University School of Medicine, Cleveland, OH,
in Mali that provided schools with latrines, water points, drinking and
United States, 2U.S. Naval Medical Research Unit - 6, Lima, Peru
handwashing stations, cleaning supplies, hygiene promotion, and training
on management and governance. We randomly selected 100 primary It has long been established that the malaria parasite, Plasmodium vivax,
schools participating in the WASH program and matched them to 100 depends on the interaction of its Duffy Binding Protein (DBP) with the
control schools that were not participating in the program based on erythrocyte Duffy antigen (either FyA, FyB) for host cell invasion. Recent
location, school population, and the presence of latrines and water points evidence has indicated that patients who are FyAFyA homozygotes are
before the start of the program. Unannounced visits were conducted far less likely to experience severe vivax malaria and that DBP protein has
between February 2013 and June 2014, for a total of seven visits per a lower binding affinity for this version of the Duffy receptor. As most
school. At each visit we conducted a roll-call of all pupils in the school and vaccine resources and strategies concentrate on the parasite's use of the
asked 40 pupils to provide a one-week recall of absence, diarrhea, and Duffy Binding Protein, it is important to determine if current studies of
symptoms of respiratory infections. We evaluated schools for adherence the FyB::DBP interaction should remain the sole interaction for vaccine
to the program. We will employ random effects longitudinal regression development or if we need to explore the FyA::DBP more closely. The
analysis with data clustered at the school level to examine the association focus of this study was to examine the ability of P. vivax to invade red
between participation in the WASH program and roll-call absence, self- blood cells in vitro and to determine if inhibition of the parasite's invasion
reported absence, self-reported diarrhea, and self-reported symptoms of of FyAFyA red blood cells differs from FyBFyB cells. Reticulocyte enriched
respiratory infections. The study is powered to detect a 20% reduction in blood samples of varied Duffy-positive FyBFyB and FyAFyA homozygotes
pupil absence and a 30% reduction in diarrhea. Data will be analyzed after were exposed to different strains of P. vivax with genetic variations of DBP
the final round of data collection in June 2014. ( P. vivax strains Nicaragua, Indonesia, and Thailand). New invasions were
measured using flow cytometry and selective staining techniques, with
603 and without anti-DBP blocking antibodies. The results showed that the
blocking ability of the anti-DBP antibodies was highly dependent upon the
A CHIMERIC PLASMODIUM VIVAX CSP TAILORED TO parasite strains used. Anti-DBP antibodies directed against the DBP Sal 1
ENHANCE THE CELLULAR IMMUNE RESPONSE variant showed a 97.0% inhibition of invasion into FyAFyA red blood cells
by P. vivax Indonesia, but only a 24.8% inhibition into FyBFyB red blood
Jairo A. Fonseca, Monica Cabrera-Mora, Balwan Singh, Alberto cells by the same strain. Conversely, anti-DBP antibodies showed 1.4%
Moreno inhibition and 12.7% inhibition of P. vivax Nicaragua invasion into FyAFyA
Emory Vaccine Center, Atlanta, GA, United States and FyBFyB red blood cells, respectively. Invasion by P. vivax Thailand was
Plasmodium vivax is the most widespread species of Plasmodium not inhibited in either Fy genotype. Also, anti-DBP antibodies showed
representing 50% of the malaria cases occurring outside sub-Saharan highly varied efficacy against invasion by all strains into Duffy-negative
Africa. Existing control measures have significantly reduced the burden of (Fy0Fy0) red blood cells. These results demonstrate that differences in the
malaria in the past 10 years. However, these measures are not effective parasite's DBP polymorphisms may play a large role in invasion success in
against hypnozoites a dormant stage form responsible of P. vivax relapse the absence of other complex genetic factors between donors. This work
infections. An effective vaccine is therefore essential to the control and indicates that both the genotype of the P. vivax and the Fy genotype of
eradication of P. vivax. A well characterized vaccine candidate is the the host are potentially important considerations in the development of
circumsporozoite protein (CSP). Anti-CSP antibodies have the ability to vaccine candidates.
inhibit the invasion of hepatocytes by P. vivax sporozoites in vitro. Cellular
immune responses against CSP have also been correlated with protection. 605
However, preclinical and clinical data of P. vivax CSP based vaccines
have shown limited success in inducing cellular immune responses. ANTIBODIES TO A HYPOTHETICAL FALCIPARUM MALARIA
Based on our reported data on the use of chimeric P. yoelii proteins to ANTIGEN (PF3D7_1134300) INHIBIT ERYTHROCYTE INVASION
enhance cellular reactivity, we decided to design a recombinant chimeric Ian C. Michelow1, Dipak K. Raj1, Christina Nixon1, Christian
protein based on the P. vivax CSP. In this study we tested the capacity of P. Nixon1, Sara Nelson1, Sunthorn Pond-Tor1, Joanna Glanz1,
a recombinant protein chimera containing immunogenic domains that Kai Fricke1, Jennifer Friedman1, Michal Fried2, Patrick E. Duffy2,
preserved the protein topology described for P. yoelii. The chimeric protein Jonathan D. Kurtis1
was expressed in soluble form with high yield. The proper configuration 1
Center for International Health Research, Rhode Island Hospital, Medical
and antigenic integrity of the protein were defined by western blot
School of Brown University, Providence, RI, United States, 2Laboratory of
analysis and ELISA. Groups of six different strains of mice were used to
Malaria Immunology and Vaccinology, National Institute of Allergy and
test immunogenicity. The chimeric protein was able to induce robust
Infectious Diseases, National Institutes of Health, Washington, DC, United
antibody responses in all the mice strains tested against the immunogen.
Interestingly, synthetic peptides representing the allelic forms of the P.
vivax CSP were also recognized to a similar extent regardless of the mouse We previously screened a Plasmodium falciparum 3D7 strain blood stage
strain. Cellular immune responses were investigated by IFN-y and IL-4 cDNA phage display library using a differential approach and identified
ELISPOT test as well as intracellular cytokine staining measured using flow three antigens encoded by PF3D7_1335100 [MSP-7], PF3D7_1021800
cytometry. The immunization regimen resulted in robust production of [PfSEA-1] and PF3D7_1134300 that are uniquely recognized by antibodies
in plasma from resistant Tanzanian children but not by those from
susceptible children. Resistance was defined by a median parasite density erythrocytes, attenuated with Tafuramycin-A, to evaluate its' safety and
of zero (IQR, 25) documented in monthly blood smears obtained from immunogenicity in humans. The results from this study will be available in
children between 2 and 3.5 years. The current work characterizes the the second half of 2014 and will be presented. This is the first evaluation
effector function of murine polyclonal antibodies directed against the of a whole parasite blood-stage malaria vaccine approach in humans.
immunorelevant portion of PF3D7_1134300. In silico analysis (PlasmoDB.
org) predicts that the 6684 bp gene encodes a 263 kDa phospho-protein, 607
contains no introns and has rodent syntenic orthologs. We cloned
the immunorelevant region (nt 1,337,023-1,338,945) as well as three HUMANIZED HLA MICE ARE PROTECTED AGAINST
overlapping constituent fragments into a eukaryotic expression plasmid CHALLENGE WITH PLASMODIUM FALCIPARUM
(VR2001) and immunized mice to generate antisera. To confirm that SPOROZOITES (PFSPZ) WHEN IMMUNIZED WITH IRRADIATED
PF3D7_1134300 encodes a parasite protein, we probed P. falciparum 3D7 PFSPZ OR LIVE PFSPZ UNDER CHLOROQUINE COVER BUT
infected and uninfected erythrocytes with antisera, which recognized the NOT BY IMMUNIZATION WITH HUMAN ADENOVIRUS
relevant full length protein only in infected erythrocytes. We performed 5-VECTORED PLASMODIUM FALCIPARUM ENCODING AMA1
growth inhibition assays (GIA) by synchronizing 3D7 parasites three times AND CSP
with sorbitol and cultivating them to obtain mature trophozoites that were
plated at 1.5% parasitemia (hematocrit 1.0%). Trophozoites were cultured Sai P. Majji1, Wathsala Wijayalath1, Soumya Shashikumar1, Sandra
in the presence of heat-inactivated and pre-adsorbed PF3D7_1134300 Inoue1, Andrea Akyeampong1, Thomas Richie1, Teodor-Doru
anti-sera or pre-immune mouse sera for 24 hours and ring stage parasites Brumeanu2, Sofia Casares1
were enumerated. Anti-sera directed against the antigen of interest and 1
Naval Medical Research Center/Walter Reed Army Institute of Research,
its constituent fragments inhibited parasite invasion by 31-53% compared Silver Spring, MD, United States, 2Uniformed Services University of Health
to controls (all P < 0.01). Based on the observation that extra-cellular Sciences, Bethesda, MD, United States
merozoites appeared to aggregate in the presence of anti-sera, we are Development of humanized mouse models that are able to act as
conducting studies to explore the mechanism of invasion arrest. Our surrogate human immune system is a highly pursued goal for testing
data suggest that PF3D7_1134300 may be a novel vaccine candidate for human vaccine candidates, generating fully human monoclonal antibodies
pediatric falciparum malaria. and studying the development of human immune system. Previously we
have demonstrated that humanized mice expressing HLA molecules in
606 NOD.RagKO.IL2RgcKO background (DRAG/DRAGA) that were infused
with HLA matched human hematopoietic stem cells develop a functional
human immune system and respond to vaccination. Humanized HLA
A CHEMICALLY ATTENUATED PLASMODIUM FALCIPARUM mice also develop human hepatocytes, kupffer cells, liver endothelial cells
WHOLE PARASITE BLOOD-STAGE VACCINE and erythrocytes and sustain the vertebrate life cycle of P. falciparum.
Danielle I. Stanisic1, James Fink2, John Gerrard2, Lana Sundac2, Herein we show that humanized mice are protected against liver stage
Xue Q. Liu1, Jolien Pingnet1, Ingrid B. Rodriguez1, Moses Lee3, Plasmodium falciparum infection upon immunization with irradiated
Terry Spithill4, Chris B. Davis1, Eric Hanssen5, Jo-Anne Chan6, Pfspz or live sporozoites under chloroquine cover. In contrast, humanized
Christine Langer6, James G. Beeson6, Stephen L. Hoffman7, HLA mice were not protected by immunization with human adenovirus
Michael F. Good1 5-vectored P. falciparum NMRC-M3V-Ad-PfCA encoding AMA1 and CSP
constructs. Humanized HLA mice represent a new pre-clinical model for
Griffith University, Southport, Australia, 2Gold Coast University Hospital,
testing vaccines against malaria.
Southport, Australia, 3Hope College, Holland, MI, United States, 4LaTrobe
University, Bundoora, Australia, 5University of Melbourne, Melbourne,
Australia, 6Burnet Institute, Melbourne, Australia, 7Sanaria Inc., 608
Gaithersburg, MD, United States
Malaria is a leading cause of morbidity and mortality attributable to FALCIPARUM MHC CLASS I PEPTIDES SEQUENCED FROM
infectious disease. The possibility of a malaria vaccine was first realized INFECTED LIVER CELLS
in the 1940s, yet a vaccine capable of inducing long lasting immunity
remains elusive. We have shown that a chemically attenuated whole Kimberly Edgel1, Cathy Zou1, Sri Hadiwidjojo1, Jessica Bolton1,
parasite blood-stage vaccine, consisting of ring stage malaria parasites Joao Aguiar1, Emily Smith1, Parimal Samir2, Xinnan Niu2, Andrew
attenuated with the Cyclopropylpyrroloindole analogue Tafuramycin-A, Link2, Eileen Villasante1, Vincent R. Gerbasi1
offers profound protection in rodent models. To evaluate this vaccine 1
Naval Medical Research Center, Silver Spring, MD, United States,
approach in humans, suitable reagents and systems were developed. 2
Vanderbilt University Medical School, Nashville, TN, United States
Two malaria cell banks, consisting of human red blood cells infected with Sterile protection from Plasmodium falciparum (Pf) infection can be
Plasmodium falciparum NF54 or 7G8, were manufactured by in vitro achieved by developing potent cell mediated immunity against malaria
cultivation of the malaria parasites in a GMP compliant facility. Clinical liver stages. Liver stage immunity has been established in human clinical
studies were undertaken to assess the safety and infectivity of these trials using two different but similar approaches: 1. Immunization with
cell banks in malaria naïve human volunteers. The cell banks were well radiation-attenuated-sporozoites (RAS) and 2. infection-treatment-
tolerated, however differential infectivity was observed between the 2 vaccination (ITV). The model for RAS immunization suggests that
cell banks, with a significantly higher dose of NF54 required to initiate attenuated sporozoites enter hepatocytes, initiate development, and then
a blood stage infection. Phenotypic analysis of the malaria parasites in die leaving behind parasite material for degradation and presentation
the two cell banks prior to participant inoculation revealed a profound on MHC Class I receptors. During ITV human volunteers are challenged
difference. Unlike the 7G8 parasites, the NF54 parasites were unable to with live sporozoites under chloroquine coverage resulting in complete
adhere to CD36 and there was an absence of knobs on the parasitised hepatocyte invasion and development. Both RAS and ITV immunization
erythrocyte surface. Interestingly, when infectivity of the NF54 cell bank suggest that liver stage immunity is mediated by Class I presentation of Pf
was demonstrated, parasitised erythrocytes obtained ex vivo from the peptides by either aborted liver stage development or during successful
study participants were able to adhere to CD36 and knob expression was merozoite development. A long standing goal in the malaria vaccine field
observed. Following these studies, the P. falciparum 7G8 cell bank was is to identify the Pf antigens that induce liver stage immunity. Towards
selected for the manufacture and evaluation of a chemically attenuated this goal we have worked to identify Pf Class I peptides presented from in
blood-stage malaria vaccine in humans. Malaria naïve volunteers will be vitro infected human hepatocytes by direct peptide sequencing. We have
inoculated with a single dose of 3 x 107 P. falciparum 7G8 parasitised identified a core group of 12 Pf proteins sequenced from three genetically
distinct primary human hepatocyte sources infected with sporozoites. promotes the disruption of interendothelial cell junctions (IEJs) between
Among this core group of Pf proteins we have identified a subset that these cells. This process is mediated by the delocalization of β-Catenin
induces IFN-γ secretion from PBMCs of RAS-protected volunteers. In our from the adherent junctions to the nuclei and the activation of the Tcf/
future experiments we will test this core group of liver stage antigens as LEF pathway, which leads to the detachment of the HBMECs. Infecting
vaccine candidates in malaria challenge models. HBMECs with a lentivirus carrying a dominant negative mutant tcf4
vector, we were able to inhibit the detachment of HBMECs induced by
609 P. falciparum. Compounds that inhibit the activation of the β-Catenin
pathway also inhibit the disruption of IEJs and detachment of HBMECs
IMMUNODOMINANCE AND VACCINE DEVELOPMENT: NEW induced by P. falciparum and have a protective effect against experimental
INSIGHTS FROM PROTEOME-WIDE PROFILING OF T CELL cerebral malaria in mice. Our findings describe an unprecedented role for
AND ANTIBODY RESPONSES TO MALARIA β-Catenin in the maintenance of the BBB integrity in the setting of cerebral
malaria and open new perspectives for the treatment of the disease.
Carla Proietti1, Angela Trieu1, Joanne Roddick1, Bruno
Douradinha1, Leanne Robinson2, Ivo Mueller2, Peter Siba2, Lutz
Krause1, John Sidney3, Alessandro Sette3, Denise Doolan1
QIMR Berghofer Medical Research Institute, Brisbane, Australia, 2Papua MULTIPRONGED PROTEOMICS AND METABOLOMICS
New Guinea Institute of Medical Research, Madang, Papua New Guinea, ANALYSIS OF PLASMODIUM FALCIPARUM AND P. VIVAX
La Jolla Institute for Allergy and Immunology, La Jolla, CA, United States INDUCED ALTERATIONS IN HUMANS TO DECIPHER DISEASE
For many infectious diseases, the development of effective vaccines PATHOGENESIS AND IDENTIFY SURROGATE MARKERS
based on immunodominant antigens has thus far not been successful.
Immunodominance is the phenomenon whereby pathogen-specific Sandipan Ray1, Sandip K. Patel1, Vipin Kumar1, Apoorva
immune responses target only a small fraction of the full range of Venkatesh1, Nithya Gogtay2, Gangadhar Chatterjee3, Urmila
possible antigens and epitopes. It is a central feature of immunity but Thatte2, Kunal Sehgal4, Arunansu Talukdar5, Sanjay K. Kochar6,
what distinguishes effective immune targets from less effective targets Dhanpat K. Kochar6, Rapole Srikanth7, Santosh G. Varma3, Swati
is not obvious. In experimental infections with simple organisms, Patankar1, Sanjeeva Srivastava1
immunodominance results in only a few specificities dominating the host's
Department of Biosciences and Bioengineering, Indian Institute
response. Large pathogens such as the Plasmodium parasite represent of Technology Bombay, Mumbai, India, 2Departments of Clinical
a far greater challenge because of the complexity and scale of potential Pharmacology, Seth GS Medical College and KEM Hospital, Mumbai, India,
immune targets. We have generated unique datasets of proteome-wide
Department of Biochemistry, Government Grant Medical College and Sir
T cell responses and antibody responses to Plasmodium using omics-scale JJ Group of Hospitals, Mumbai, India, 4PD Hinduja National Hospital and
technology platforms, including protein microarrays and epitope prediction Medical Research Centre, Mumbai, India, 5Medicine Department, Medical
algorithms, with specimens from humans experimentally or naturally College Hospital Kolkata, Kolkata, India, 6Department of Medicine,
exposed to malaria. We have integrated these datasets to develop metrics Malaria Research Center, S.P. Medical College, Bikaner, India, 7Proteomics
of immunological, structural and genetic parameters associated with Laboratory, National Centre for Cell Science, Pune, India
antigen immunodominance in the context of a complex parasite. We In this study serum samples from severe and non-severe falciparum
establish that the repertoire of T cell reactive antigens is largely distinct and vivax malaria patients and healthy controls from different endemic
from the repertoire of antibody reactive antigens, and that T cell target regions of India were investigated using multiple quantitative proteomics
antigens are more conserved as compared with antibody targets. We approaches and results were validated in larger clinical cohorts by
further establish that the immunodominance hierarchy for antibody using WB, ELISA and surface plasmon resonance-based measurements.
responses is influenced by structural or functional properties that differ Additionally, metabolomics analysis was performed using LC-MS/MS
from those that underlie the hierarchy for T cells. By defining the degree to identify the altered metabolites and associated pathways in malaria.
to which immunodominance shapes immunity against Plasmodium and Specificity of the identified serum markers was evaluated by analysis
identifying antigens and epitopes that represent key targets of protective of dengue fever and leptospirosis patients as febrile disease controls.
immunity in humans, our studies have direct outcomes for vaccine In quantitative proteomic analysis, 67 and 82 differentially expressed
development. These also data further our understanding of host-pathogen (p < 0.05) serum proteins were identified in falciparum and vivax
interactions. malaria respectively, and almost half of these proteins were commonly
modulated in both of the plasmodial infections. Using LC-MS coupled
with multivariate statistical data analysis approaches over 3000 serum
610 metabolites were screened among which nearly 200 exhibited altered
PLASMODIUM FALCIPARUM ACTIVATION OF Β-CATENIN serum level in the malaria patients. Functional pathway analysis involving
MEDIATES THE DISRUPTION OF INTERENDOTHELIAL CELL the identified proteins and metabolites revealed the modulation of
different vital physiological pathways including acute phase response
signaling, amino acid and lipid metabolism, chemokine and cytokine
Julio Gallego-Delgado1, Upal Basu-Roy1, Maureen C. Ty1, signaling, complement cascades and blood coagulation in malaria.
Matilde Alique2, Cristina Fernandez-Arias1, Alexandru Movila1, Different hematological, liver and renal function parameters were also
Samuel C. Wassmer1, Marta Ruiz-Ortega2, Ana Rodriguez1 measured in malaria patients and controls. Hemoglobin level and platelet
New York University Langone Medical Center, New York, NY, United count found to be significantly lower (p < 0.01) in the malaria patients.
States, 2IIS-Fundación Jiménez Díaz, Madrid, Spain ROC curve analysis demonstrated Serum amyloid A, Apolipoprotein E
and Haptoglobin as efficient predictor proteins (AUC > 0.90) for malaria
A high proportion of deaths by Plasmodium falciparum is caused by
detection at an early stage of infection. Expression levels of these three
cerebral malaria, the most profound syndrome of severe malaria that is
serum proteins also exhibited good correlation with parasite count (r >
fatal within 24-72 hours in 20% of the cases. The disruption of the blood
0.5; p < 0.001). Interestingly, analysis of longitudinal cohorts (early febrile,
brain barrier (BBB), characteristic of cerebral malaria, causes diffusion of
defervescence and convalescent stages) indicated cyclic alterations in
blood cells and serum into the brain tissue leading to coma and damage
the expression levels of Haptoglobin, Retinol binding protein, ApoE and
to the nervous system. The mechanisms underlying this process are
Apo-A1 during the different stages of the infection, which could serve
largely unknown but the need for adjunct therapy to rescue patients from
as indictors of the disease progression. Our findings may open up new
death is mandatory due the high rate of mortality. Using monolayers of
human brain microvascular endothelial cells (HBMECs), we have observed
that incubation with erythrocytes infected with Plasmodium falciparum
opportunities for the early detection and prognosis of malaria as well as blood stages, while peripheral samples were exclusively young ring stages.
could provide better understanding of disease pathogenesis and host Aotus (n= 1) infected with non-CSA-binding parasite lines (CAMP; FVO)
responses in malaria. before pregnancy developed recrudescences during subsequent pregnancy,
similar to the experience of women. CS2 parasites collected from pregnant
612 Aotus express VAR2CSA on the infected erythrocyte (IE) surface, and bind
specifically to CSA. Similar to immune multigravid women, a monkey
THE ROLE OF ENDOTHELIN-1 IN THE VASCULAR infected with Pf-CS2 parasites over successive pregnancies acquired
PATHOBIOLOGY OF CEREBRAL MALARIA antibodies against VAR2CSA, and purified antibodies blocked the binding
of several maternal parasite isolates to CSA. In summary, Pf infections
Brandi D. Freeman, Yuri Chaves Martins, Mahalia S. in pregnant Aotus monkeys recapitulate all the prominent features of
Desruisseaux malaria infection and immunity in pregnant women, and can be useful for
Albert Einstein College of Medicine, Bronx, NY, United States basic mechanistic studies as well as preclinical studies to qualify candidate
Cerebral malaria (CM) is a serious complication of Plasmodium pregnancy malaria vaccines.
falciparum infection associated with cerebral vasculopathy, high
mortality, and adverse neurological sequelae. The vasoactive peptide, 614
endothelin-1 (ET-1), has been shown to mediate blood-brain barrier (BBB)
permeability, inflammation, and vascular tone, and may be important SPLENIC PATHOLOGY SUPPORTS THE ACCELERATION OF
in CM pathogenesis. We previously reported that ET-1 was important SEVERE MALARIA THROUGH HIV INFECTION IN PEDIATRIC
in regulating cerebral blood flow, brain microvascular hemorrhage and PATIENTS
mortality in our experimental CM (ECM) model. These actions were
mediated by ET-1 activation of the endothelin A (ETA) receptor. To test Regina Joice1, Charles Frantzreb1, Alana Pradhan2, Clarissa
the hypothesis that ET-1 is involved in the pathological process of ECM, Valim1, Javier G. Ogembo3, Joyce Fingeroth3, Karl B. Seydel4,
we investigated ETA receptor mediated signaling in mice infected with P. Steve Kamiza5, Dyann F. Wirth1, Manoj Duraisingh1, Malcolm E.
berghei ANKA (PbA). ETA receptor blockers (ETARB) significantly improved Molyneux6, Terrie E. Taylor4, Matthias Marti1, Danny A. Milner, Jr.2
survival in ECM mice. In addition, ETARB enhanced vascular integrity during
Harvard School of Public Health, Boston, MA, United States, 2Brigham
PbA infection. BBB permeability, and protein levels of angiopoietin-2 and and Women's Hospital, Boston, MA, United States, 3Beth Israel Deaconess
VCAM-1 were significantly lower in ECM mice treated with ETARB than in Hospital, Boston, MA, United States, 4Michigan State University, East
mice treated with saline. In addition, ETARB prevented the ECM-induced Lansing, MI, United States, 5Queen Elizabeth Hospital, Blantyre, Malawi,
decrease in angiopoietin-1 in PbA-infected mice. CM is associated with
Malawi-Liverpool-Wellcome Trust Clinical Research Programme, Blantyre,
astrogliosis in both human disease and in experimental models. Our Malawi
preliminary data indicate that astrogliosis is associated with abnormal A number of cohort studies have demonstrated that HIV-1 infection
protein levels of connexin 43 (Cx43), a gap junction protein critical in correlates with severe Plasmodium falciparum malaria (higher parasitemia,
gliosis and BBB integrity. ETARB prevented the PbA-induced dysregulation more clinical malaria complications, and higher case fatality rate), and in
of Cx43. We hypothesized that ET-1 mediated vascular dysfunction in vitro studies have shown that HIV-1 impairs phagocytosis of parasitized
ECM potentially by regulating neuroinflammation and Cx43 expression. erythrocytes by macrophages. As macrophage-mediated clearance of
In this regard, we observed a reduction in the activation of JNK in the parasites in the spleen plays an important role in the clearance of parasites
brains of mice with ECM. JNK, a downstream substrate of ET-1, has been during malaria infection, we hypothesized that histological analysis of
demonstrated to regulate Cx43 expression and function, and is important the spleen might further elucidate the mechanisms by which HIV-malaria
in CM. Our data indicate that ET-1 may mediate the vascular pathology co-infection accelerates progression to severe malaria. As part of a post-
and neuroinflammation in ECM via regulation of JNK signaling and mortem study in Blantyre, Malawi of parasitemic comatose children, we
subsequent Cx43 dysregulation. The ET-1 pathway may thus be a potential systematically surveyed malaria parasites across organs in patients with
therapeutic target as an adjunct in the treatment of human CM. and without HIV. The overall HIV seropositivity rate in the cohort was 21%.
Using a combination of histology, immunohistochemistry and qRT-PCR, we
613 found that HIV-positive patients had significantly higher parasite loads in
brain, heart, gut, spleen and skin. The difference was most pronounced
PLASMODIUM FALCIPARUM IN AOTUS: A NOVEL MODEL in the spleen where the difference in the mean number of parasites was
FOR PLACENTAL MALARIA highly significant (320 ± 139 vs 81 ± 20 parasites in 10 high power fields,
p = 0.0018). In a focused histological analysis of the spleen, we found that
Ankur Sharma, Adovi Akue, Lynn Lambert, Sachy Orr-Gonzales,
HIV-positive cases had higher levels of "free" parasitized erythrocytes, i.e.
Jessica Hinderer, Dariyen Carter, Tom Thomas, John Bacher, Michal
those not engulfed by macrophages, while phagocytosed parasites could
Fried, Patrick E. Duffy
be readily observed in HIV-negative cases. These HIV-specific effects were
National Institutes of Health, Rockville, MD, United States significant, even across a wide range of values for peripheral parasitemia,
Pregnant women are infected with a distinct Plasmodium falciparum hematocrit, and final histologic diagnosis (cerebral malaria or non-
(Pf) phenotype that binds to chondroitin sulfate A (CSA) and grows to malarial coma). These data suggest that HIV infection enhances parasite
high density in the placenta. Placental sequestration is linked to severe sequestration in many different organ systems, and specifically in the
pathologies in the mother and offspring, leading to tens or hundreds of spleen, where phagocytosis of parasites is impaired. These findings bridge
thousands of deaths each year. CSA-binding parasites express VAR2CSA, in vitro mechanistic data and in vivo association study data to further
a distinctly structured member of the Pf erythrocyte membrane protein 1 elucidate the process by which HIV accelerates progression to severe
(PfEMP1) variant surface antigen family that is now the leading target for malaria.
vaccine development. Further research progress is hindered in the absence
of an animal model that recapitulates the features of human placental
malaria. Previous work has shown that Pf can infect and sequester in brain,
heart and spleen of non-pregnant Aotus, and we sought to establish
a model of placental malaria using this parasite-monkey combination.
We infected pregnant Aotus (n= 2) with CSA-binding Pf-CS2 during the
3rd trimester and observed a pronounced sequestration of parasites in
placental intervillous spaces, with ~30-fold higher parasite density in
placental versus peripheral blood. Most placental parasites were mature
615 3 additional P. knowlesi strains. RBC age-dependent invasion assays and
proliferation assays demonstrate that these lab stains exhibit different
CHILDREN WITH CM MANIFEST MARKED DIFFERENCES IN capacity in invading human RBCs. We are currently carrying adaptation
GLOBAL STRESS RESPONSES WHICH ARE ASSOCIATED WITH experiments for these additional lines. To determine whether variations
CEREBRAL PARASITE SEQUESTRATION AND UNDERLYING observed in the lab are also found in the field, we investigated the human
PATHOPHYSIOLOGY RBC tropism of 32 field strains isolated from patients admitted to Kapit
Hospital, Sarawak, Malaysia. The in vivo preference determination of 26
Catherine Manix Feintuch1, Karl Seydel2, Alex Saidi3, Adam of them shows that a majority of the strains have a skew for invading
Goldman-Yassen1, Ryung Kim1, Terrie Taylor2, Johanna Daily1 younger RBCs (18/26). Indeed, 5 isolates display a very strong preference
Albert Einstein College of Medicine, Bronx, NY, United States, 2Michigan in invading reticulocytes. In vitro invasion assays performed with 9 isolates
State University, East Lansing, MI, United States, 3Blantyre Malaria Project, (parasite density greater than 10,000/ul) confirm that field strains differ
Blantyre, Malawi significantly in the range of human RBCs they can invade. Together, these
Cerebral Malaria (CM), a severe complication of Plasmodium falciparum results suggest a significant variation in the ability of P. knowlesi strains to
infection, is associated with a high rate of mortality and neurological invade human RBCs,underlying a possible mechanism for the virulence of
sequelae. The WHO defines CM as a single clinical entity of coma and the parasite in human infections.
peripheral blood malaria parasitemia; however, disease heterogeneity
has been suggested by the identification of brain sequestration (RET+) 617
in some but not all patients with CM. RET+CM is associated with brain
microvascular pathology, parasite sequestration, coagulopathy and
heightened inflammation. To explore potential mechanistic diversity SYNTHETASE GENE FAMILY
in factors resulting in CM, we carried out unsupervised clustering on Selina Bopp, Allison Demas, Pamela Magistrado, Sarah Volkman,
whole blood transcriptomes from 98 children with CM and identified Ulf Ribacke, Dyann Wirth
three transcriptional clusters. One cluster was significantly associated
Harvard School of Public Health, Boston, MA, United States
with hyperparasitemia (p<0.0001) and another cluster with lack of brain
sequestered parasites (RET-) (p=0.028). To further define host features The plasticity of the Plasmodium falciparum genome allows this malaria
associated with parasite sequestration, we then compared transcriptional parasite to adapt quickly to selective pressures encountered in the human
profiles between samples associated with brain sequestered parasites host by the acquisition of single nucleotide polymorphisms, recombination
(RET+) to lack of brain sequestrated parasites (RET-) taking parasite load or gene duplications. One example of such duplication events is the acyl
into account. Gene sets associated with RET+CM reflected heightened Co-A synthetase (ACS) gene family where four conserved orthologs of
inflammation (cytokine activity GO.000512), changes in neutrophil ACS are predicted to perform classical ACS function while nine paralogs
(neutrophil chemotaxis GO.0030593) and platelet (alpha granules have expanded and diverged from the PfACS9 ortholog and their function
GO.0031093) biology and dysregulation of coagulation (blood coagulation remains unknown. ACSs activate fatty acids (FA), which can then be used
GO.0007597). Elevated plasma inflammatory cytokines and neutrophil for protein modification, phospholipid biosynthesis, FA elongation, and
proteins were found in RET+ samples, consistent with the RNA data. beta-oxidation. In P. falciparum the majority of FA are taken up from the
Surprisingly, neutrophils isolated from RET+ patients at the time of host environment. Long-range haplotype analysis suggests that members
infection displayed impaired chemotaxis towards IL-8. In contrast, the of this gene family are under recent positive selection. To address the
transcriptional profiles of children with RET-CM were associated with biological function of the individual members of the PfACS family, we
upregulation of non-inflammatory stress pathways (protein catabolism tagged individual genes with an HA tag and a protein degradation domain
pathways: GO.0006511; DNA repair pathways: GO.0006270) and type I resulting in inducible protein knockdowns. These modifications allowed
interferon. Our data suggests host response diversity despite similar clinical us to identify different expression patterns and distinct cellular localization
presentations of WHO defined CM. Irrespective of parasite load, we found of individual ACSs that could be a result of neo-functionalization. PfACS5
that children with cerebral parasite sequestration demonstrate evidence of and PfACS1a were exported to the host cell cytosol and membrane
neutrophil activation and coagulopathy. Further study of how neutrophil periphery while PfACS9 remained within the parasite. Comparison of
and platelet biology is involved in sequestration and why children with growth rates for wildtype and PfACS1a, PfACS4, PfACS5 and PfACS9
RET-CM have distinct host profiles could reveal novel strategies to prevent knockdown parasites in complete media did not differ and we could
brain sequestration in CM and improve clinical outcomes. not detect any changes in gene expression of any other family member
by quantitative RT-PCR. However, growth defects could be detected for
PfACS5 knock down parasites in media containing restricted glucose and
616 solely palmitic and oleic acid. We hypothesize that the expansion and
PHENOTYPIC VARIATION IN THE ABILITY OF PLASMODIUM recent positive selection of the PfACS gene family are the consequence
KNOWLESI LAB AND FIELD STRAINS FOR THE INVASION OF of metabolic pressures driving parasite evolution, and understanding FA
HUMAN RED BLOOD CELLS metabolism will give us insight into key metabolic pathways that might
serve as potential targets for novel antimalarials.
Caeul Lim1, Elsa Hansen1, Angela Siner2, Caroline O. Buckee1,
Balbir Singh2, Manoj T. Duraisingh1 618
Harvard School of Public Health, Boston, MA, United States, 2Malaria
Research Center, Kuching, Malaysia MUTATIONAL STUDIES FOR FUNCTIONAL
Plasmodium knowlesi, primarily a simian parasite, is now the major cause
of human malaria in Malaysian Borneo. While the majority of the cases PLASMODIUM FALCIPARUM
are uncomplicated, clinical profiles similar to that of severe P. falciparum April M. Pershing, Praveen Balabaskaran Nina, Michael W.
cases occur in a small subset of infected patients, with high parasitemia as Mather, Akhil B. Vaidya
the only risk factor consistently associated with disease severity. However,
Drexel University College of Medicine, Philadelphia, PA, United States
there has been little investigation to understand what causes such disparity
in parasitemia. Recently, we showed that P. knowlesi H strain, a primate The energy-converting rotary nanomotor ATP synthase is a central player
adapted lab strain, preferentially invades very young human red blood in the bioenergetics of most organisms. However, several studies have
cells (RBCs). This strain however can gradually adapt to proliferate at a found that blood stages of Plasmodium falciparum rely on glycolysis as
much higher efficiency in human blood. To expand this observation to its major source of ATP rather than oxidative phosphorylation, suggesting
other P. knowlesi strains, we have established in vitro culture rhesus RBCs dispensability of ATP synthase. Yet, we have been unable to disrupt the
genes encoding the β and γ subunits of the ATP synthase complex in var repertoires. This new tool will advance efforts to understand the role of
P. falciparum blood stages, raising the possibility that non-enzymatic PfEMP1 variation in pathogenesis and immune evasion and may aid in the
functions of the ATP synthase may be essential. To address this possibility, design of diversity-covering malaria vaccines.
we aimed to design a catalytically inert but structurally intact ATP synthase
complex. A conserved residue in the catalytic site of the β subunit 620
was identified as an initial target for mutagenesis. A merodiploid line
expressing a tagged mutated β subunit at an ectopic site was generated in SUBTLE CHANGES IN PLASMODIUM FALCIPARUM INFECTION
Dd2attB and NF54attB parasites. In theory, this should reduce the overall COMPLEXITY FOLLOWING ENHANCED INTERVENTION IN
ATP synthase catalytic activity by about 87.5%. Although the mutant MALAWI
subunit was correctly trafficked to the mitochondrion in both lines, the
transgenic parasites grew at the same rate as the parental lines, indicating Tamika J. Sisya1, Raphael M. Kamn'gona1, Jimmy A. Vareta2,
that the ectopically expressed mutant subunits did not have a dominant Joseph M. Fulakeza1, Mavuto F. Mukaka3, Miriam K. Laufer4, Karl
negative effect. Mitochondria from the NF54attB merodiploid line were B. Seydel5, Terrie E. Taylor5, Standwell C. Nkhoma1
isolated and initial blue native page results indicated the mutant form of
Malawi-Liverpool-Wellcome Trust, Blantyre, Malawi, 2Blantyre Malaria
the protein being incorporated into the complex. Given that no dominant Project, Blantyre, Malawi, 3Johns Hopkins University, Baltimore, MD,
negative effect was seen with the merodiploid lines, a synthetic gene to United States, 4Centre for Vaccine Development, University of Maryland,
replace the endogenous gene with a mutated version through single allelic Baltimore, MD, United States, 5College of Osteopathic Medicine, Michigan
exchange has been designed and will be transfected into the sexually State University, East Lansing, MI, United States
competent NF54 line. We are furthermore attempting to knockdown the With support from the Global Fund, the United States President's Malaria
mRNA of the β subunit with a ribozyme system. These studies will help Initiative (PMI) and other cooperating partners, Malawi is implementing
determine the role of ATP synthase in erythrocytic and insect stages of P. a comprehensive malaria control programme involving indoor residual
falciparum. spraying in targeted districts, free distribution of insecticide-treated bed
nets to children and pregnant women, and use of the highly effective
619 artemisinin-based combination therapy, CoArtem, as the first-line
treatment for malaria. We genotyped 24 genome-wide single nucleotide
AN ALGORITHM FOR ASCERTAINING THE VAR GENE polymorphisms (SNPs) in Plasmodium falciparum infections (n=295)
REPERTOIRE IN PLASMODIUM FALCIPARUM FIELD SAMPLES sampled from a single location in Malawi before and after the switch
to CoArtem to evaluate the impact of this enhanced malaria control
Mark Travassos1, Joana C. Silva2, Elliott F. Drábek2, Arthur
programme. We used the SNP data generated to examine temporal
L. Delcher3, Qi Su2, Antoine Dara1, Drissa Coulibaly4, Modibo
changes in the incidence of infections containing multiple parasite
Daou4, Ahmadou Dembele4, Issa Diarra4, Abdoulaye K. Kone4,
genotypes (MIs), mean number of heterozygous SNPs within MIs, parasite
Bourema Kouriba4, Matthew B. Laurens1, Amadou Niangaly4,
genetic diversity (He), multilocus linkage disequilibrium and effective
Karim Traore4, Youssouf Tolo4, Claire M. Fraser2, Mahamadou A.
population size (Ne). While the incidence of MIs, He, multilocus linkage
Thera4, Abdoulaye A. Djimde4, Ogobara K. Doumbo4, Christopher
disequilibrium and Ne were unchanged over time, the mean number of
V. Plowe1
heterozygous SNPs in MIs decreased significantly (p=0.0120) from 9±1 in
Howard Hughes Medical Institute/Center for Vaccine Development, 2006 to 7±1 (95% CI) in 2012. These findings indicate that the genetic
Baltimore, MD, United States, 2Institute for Genome Sciences, Baltimore, diversity of malaria parasites remains high in this area, suggesting that
MD, United States, 3McKusick-Nathans Institute of Genetic Medicine, only subtle gains, if any, have been made in reducing malaria transmission.
Baltimore, MD, United States, 4Malaria Research and Training Center, Continued surveillance is required to evaluate the impact of malaria
Bamako, Mali control interventions in this area and the rest of Malawi, and to better
Plasmodium falciparum erythrocyte membrane protein-1 (PfEMP1) target interventions.
proteins are encoded by the var gene family, present in 40 to 60 copies
per genome. PfEMP1 mediates tissue-specific cytoadherence of infected 621
erythrocytes, allowing parasites to evade clearance by the spleen and
cause pathologic effects via sequestration. An infected erythrocyte usually COMPARATIVE ANALYSIS OF FIELD ISOLATE AND MONKEY-
expresses only one PfEMP1 variant on its surface at a time. PfEMP1 ADAPTED PLASMODIUM VIVAX GENOMES
molecules undergo clonal antigenic variation that is central to their
ability to evade the host immune response. Next generation short-read Ernest R. Chan1, John Barnwell2, Peter A. Zimmerman3, David
sequencing data cannot be used to accurately and comprehensively Serre1
characterize sequence variation of this large, repetitive and highly variable
Cleveland Clinic Foundation, Cleveland, OH, United States, 2Centers for
gene family. Each var gene consists of two exons, the first of which is Disease Control and Prevention, Atlanta, GA, United States, 3Case Western
longer (2,500 -10,500 bp) and much more variable in length than the Reserve University, Cleveland, OH, United States
second (1,000 - 1,500bp). We developed a novel algorithm to perform Due to the difficulty to culture Plasmodium vivax in vitro, significant
targeted assembly of var gene exons, based on a combination of Pacific insights into this important malaria parasite is based upon a history of
BioSciences (PacBio) and Illumina data. The algorithm takes advantage of successful adaptations of human infections to non-human primates. P.
patterns of conservation at the boundaries of the single intron, and the vivax strains grown in monkeys serve as a renewable source of parasites
different variation profiles of the two exons, to generate exon 1 and exon for studying relapse characteristics, mosquito species compatibilities, drug
2 sequences from a combination of k-mer walks using Illumina reads and susceptibility profiles or immune response characteristics for potential
information from PacBio-based contig assemblies. Our novel algorithm vaccine development. However, little is known as to how the adaptation to
recovers a complement of exons which is similar in number and length a new host influences the parasite's genome and, consequently, its biology.
distribution to those found in the reference 3D7 genome, suggesting that Additionally, despite the consistent observation of complexity of infections
it captures most of the var exons in the genomes of field-derived samples. in clinical isolates, these monkey-adapted strains are typically assumed
Using this algorithm, we have characterized the repertoire of var genes to consist of a clonal population of a single strain. We describe here the
in 12 clinical samples from Mali. We are determining the constitutive comparative analysis of genome sequences from seven P. vivax parasites
domains and upstream promoters for identified vars in each sample and that have been adapted to monkey hosts with sequences obtained from
the sequence diversity present. We will compare these results to known six field isolate genomes. Our results reveal that the adaptation of parasites
into monkey hosts is unlikely to result in any systematic modification of
the genome. We also show that monkey-adapted strains are not always
homogenous and that they can still consist of a mixture of strains. transmission. Given its biphasic role, further understanding of CelTOS is
Additionally, we describe the analysis of six blood samples collected during hoped to lay the foundations for developing this key transmission protein
the generation of the Mauritania-I and Mauritania-II strains and show into a future multi-stage anti-malarial vaccine.
that, starting from a single complex infection, different strains became
dominant in different monkeys. Overall, our study highlights some of the 624
complications associated with studying monkey-adapted strains but also
provide a solid framework for developing better, more controlled studies GENOTYPIC DIFFERENCES IN DENV NEUTRALIZATION ARE
of this important resource for understanding vivax malaria. EXPLAINED BY A SINGLE AMINO ACID MUTATION THAT
622 Kimberly A. Dowd, Swati Mukherjee, Christina R. DeMaso,
ASSESSMENT OF POPULATION STRATIFICATION AND Theodore C. Pierson
COMPLEXITY OF INFECTION IN CAMBODIAN PLASMODIUM Viral Pathogenesis Section, Laboratory of Viral Diseases, National Institute
VIVAX BY HIGH-THROUGHPUT SEQUENCING of Allergy and Infectious Diseases, National Institutes of Health, Bethesda,
MD, United States
Lindsey R. Friedrich1, Jean Popovici2, Ernest R. Chan1, Didier Flaviviruses explore multiple conformations via dynamic motion of virus
Menard3, David Serre1 structural proteins. This introduces complexity to the antigenic surface,
Cleveland Clinic, Cleveland, OH, United States, 2Institute Pasteur in as virus "breathing" varies epitopes available for antibody (Ab) binding.
Cambodia, Phnom Penh, Cambodia, 3Case Western Reserve University, A recent study explored the structural basis for genotypic differences in
Cleveland, OH, United States the neutralization potency of a DENV-1 specific mAb (E111) that binds a
In Cambodia, malaria is one of the foremost public health problems and poorly exposed domain III epitope on the envelope (E) protein, as reported
its control is a high priority for the government and NGOs. Among the previously. Studies with DENV strains WP and 16007 indicated that
estimated 13.6 million Cambodians, 2.5 million individuals live in forested ~100-fold difference in neutralization sensitivity could not be explained
areas where malaria transmission is highest. With the implementation by differences in the affinity of mAb E111 for each strain. Instead, we
of extensive control efforts, the number of reported malaria cases has hypothesized that the ensemble of structures sampled by these two viruses
globally decreased since 1997, due to a decrease in falciparum malaria. was distinct. To investigate the basis for differences in the "breathing" of
By contrast, in the same period, the number and proportion of cases these two strains, we generated a panel of DENV RVP variants expressing
attributed specifically to Plasmodium vivax has significantly increased. In E protein chimeras or single amino acid differences on both WP and
order to design more efficient elimination and control strategies in this 16007 backgrounds. By assessing E111 potency against the E protein
region, it is critical to first understand the dynamics and organization of chimera RVPs, the difference in neutralization was mapped to three
the P. vivax population. Here, we described a novel sequencing assay that consecutive residues in domain II that differed between 16007 and WP.
enables robust genotyping of 130 single nucleotide polymorphisms (SNPs) Further use of single amino acid mutant RVPs demonstrated that residue
in a high-throughput and cost-efficient manner. We applied this assay 204, but not neighboring residues 202 and 203, was responsible for
to 401 P. vivax-infected patients recruited from 9 study sites throughout the difference in neutralization. That residue 204 is located at a distance
Cambodia between 2004 and 2013. Our analysis provides a thorough from the E111 epitope suggested that this amino acid dictates changes
perspective on the diversity, organization and dynamics of the Cambodian in the conformational ensembles sampled by the virus. In support of this,
P. vivax population as well as a first assessment of the factors influencing differences in neutralization by a panel of mAbs representing epitopes
complexity of infections. Overall, our study provides a foundation to distinct from E111 were all significantly modulated by the same residue.
design better control strategies against vivax malaria in Cambodia and to Our results demonstrate that neutralization susceptibility can be altered
limit the spread of antimalarial drug resistance. in an epitope-independent manner by subtle mutations that alter the
overall structural ensemble. That different conformational ensembles
623 of flaviviruses may affect the landscape available for Ab binding has
important implications for vaccine development and antibody mapping
SPATIAL DISTRIBUTION OF THE MICRONEMAL PROTEIN studies.
Fiona Angrisano1, Jake Baum2 625
Walter and Eliza Hall Institute, Parkville, Australia, Imperial College,
London, United Kingdom DENGUE VIRUSES CONTAINING ANTIBODY EPITOPES FROM
Malaria remains a major burden on the health of global populations. TWO SEROTYPES
Transmission of the malaria parasite through the Anopheline vector has
emerged as a major focus of interest with a view to developing strategies William Messer1, Boyd L. Yount2, Ruklanthi de Alwis3, Sarah
to block mosquito infection, or reinfection of the human host. To date, Gabriel1, Scott R. Royal2, Doug Widman2, Idia V. Rodriguez4,
whilst greater detail is emerging, there are still very few molecular details Carlos A. Sariol4, Aravinda M. de Silva2, Ralph S. Baric2
of any of the stages of mosquito or host re-infection. One protein that
Oregon Health & Sciences University, Portland, OR, United States,
functions in both of these stages is CelTOS (cell traversal in ookinetes
University of North Carolina Chapel Hill, Chapel Hill, NC, United States,
and sporozoites protein) a secreted soluble micronemal antigen that plays
La Jolla Institute for Allergy and Immunology, La Jolla, CA, United States,
a role in both the colonisation of the mosquito midgut by the ookinete
Caribbean Primate Research Center, San Juan, Puerto Rico
(traversing the epithelium towards oocyst formation) and infection of the Dengue is the most prevalent mosquito-borne viral disease of humans
liver by the sporozoite (traversing liver cells towards hepatocyte infection). and a major public health problem worldwide, with approximately one-
Whilst knockout of this protein has already definitively demonstrated its half of the world's population at risk of infection by the four dengue virus
function in these two distinct processes we still do not know what CelTOS (DENV) serotypes. Dengue vaccine development has been slow to date,
does or its spatial localisation during these key stages. Here we present an as achieving a balanced and robust immune response against all four
update on our work using a tagged line of CelTOS that we have developed serotypes has proven elusive. The reasons for imbalanced immunity elicited
along with a suit of imaging reagents and microscopy approaches to by candidate vaccines are not fully understood, but are thought to include
make steps towards the functional dissection of CelTOS during mosquito variable immunogenicity and competition between the live-attenuated
viruses in the vaccine formulations. However, as the precise determinants
of DENV immunity are incompletely understood, improving vaccine
formulations is difficult. Here we describe the results of investigations into secondary infection antibodies recognize novel conserved epitopes that
the role of epitopes within the DENV envelope (E) domain I/II hinge region are distinct from the E protein domain I/II hinge epitopes targeted after
in DENV immunity. We transplanted DENV-3 EDI/II residues that constitute primary exposure.
the epitope footprint of the DENV-3 specific monoclonal antibody
(MAb) 5J7 into a DENV1 infectious clone, making the recombinant 627
virus rDENV-1/3. We then transplanted the DENV-1 EDI/II residues that
constitute the epitope footprint of the DENV-1 specific MAb 1F4 into a TRANSPLANTATION OF A COMPLEX QUATERNARY
DENV-3 infectious clone, making the clone rDENV-3/1. Both rDENV-1/3 SEROTYPE-SPECIFIC NEUTRALIZING ANTIBODY EPITOPE
and rDENV-3/1 can be neutralized in vitro via the MAb corresponding BETWEEN DENGUE 3 AND 4 REVEALS DETERMINANTS OF
to the transplanted residues, demonstrating that MAb epitopes can be POLYCLONAL NEUTRALIZATION RESPONSES
transplanted between DENV serotypes. To test how epitope transplant
affected rDENV-1/3 and rDENV-3/1 neutralization by human sera, these Douglas G. Widman
viruses were tested against a panel of DENV-1 and DENV-3 1° immune University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
sera. Strikingly, both recombinant viruses are neutralized by 1° DENV-1 and Dengue virus (DENV) is the most significant human arboviral disease
1° DENV-3 human immune sera, suggesting that the recombinant viruses worldwide with upwards of 300 million infections annually; however
displays epitopes recognized by both DENV-1 and DENV-3 neutralizing the determinants of human immune responses to DENV infection
Abs in polyclonal immune sera, giving them "bivalent" qualities. To remain largely unknown. Thus we set out to develop tools with which
test the immunogenicity of these viruses in vivo, we have subsequently to characterize antibody (Ab) responses to DENV infection in humans.
challenged groups of rhesus macaques with both recombinant viruses and Using reverse genetics we developed infectious clones (IC) for all 4 DENV
here present the results of the macaque neutralizing antibody response serotypes which allow us to study Ab-virus interactions. Characterization
following infection. of a panel of monoclonal Abs (mAb) identified a strongly type-specific
neutralizing Ab of DENV3. Using a structure-guided approach a 12Å
626 region of the envelope (E) protein domain I/II (EDI/II) hinge region
encompassing mutations that led to escape of neutralization was
CHARACTERIZATION OF NEUTRALIZING ANTIBODY identified and transplanted from DENV4 into DENV3 (rDENV3/4) to assess
RESPONSES FOLLOWING NATURAL SECONDARY DENGUE the contribution of this epitope to the polyclonal immune response in
VIRUS INFECTIONS humans. Interestingly, this rDENV3/4 gained full sensitivity to neutralization
by human DENV4 immune sera while becoming resistant to DENV3 sera,
Bhumi Patel1, Gopal Sapparapu2, James B. Crowe2, Ralph Baric3,
indicating that this EDI/II hinge region contains major determinants of
Aravinda M. de Silva1
type-specific neutralization responses. When the reciprocal transplant
Department of Microbiology and Immunology, University of North was made into DENV4, mAb binding was not retained and there was not
Carolina School of Medicine, Chapel Hill, NC, United States, 2Departments a significant shift in neutralization profiles, indicating that the adjacent
of Medicine, Pediatrics, Pathology, Microbiology and Immunology, and The residues in the recipient DENV serotype play a role in epitope presentation
Vanderbilt Vaccine Center, Vanderbilt University Medical Center, Vanderbilt on the virion surface. The addition of 5 amino acid residues from DENV3
University, Nashville, TN, United States, 3Department of Microbiology and into DENV4 was able to restore mAb binding and neutralization, however
Immunology, University of North Carolina School of Medicine, Department polyclonal serum neutralization remained largely unchanged. Finally, we
of Epidemiology, University of North Carolina School of Public Health, moved a complex quaternary epitope encompassing residues spanning
Chapel Hill, NC, United States multiple E dimers into DENV4 (rDENV4/3). This rDENV4/3 was viable
Dengue Virus (DENV) is an arthropod-borne flavivirus and the causative and grew to high infectious titers and exhibited sensitivity to DENV3
agent of dengue fever and dengue hemorrhagic fever. The goal of this immune sera, while neutralization responses to DENV4 remained largely
study is to characterize the human neutralizing antibody response that unchanged. These results provide insights into the determinants of type
develops after secondary DENV exposure. As there are 4 serotypes of specific neutralization responses that could guide future development of
DENV, people can be infected multiple times, each time with a new rationally designed DENV vaccine platforms.
serotype. Based on recent studies, the dengue field has learned a lot about
the properties of neutralizing antibodies generated in people exposed to 628
dengue for the first time (primary infections) but little is known concerning
the response generated during a repeat infection with a new serotype GENERATION OF RECOMBINANT DENGUE VIRUSES
(secondary infection). Following primary infections, people develop lifelong ENCODING VARIANT ENVELOPE GENES FROM
protective immunity against the serotype of infection. Primary infections INTRASEROTYPIC GENOGROUPS REVEALS BREADTH OF
stimulate serotype-cross reactive and serotype-specific (to the serotype of TYPE-SPECIFIC NEUTRALIZATION RESPONSES
infection) antibodies. However, only a small fraction of serotype-specific
antibodies that bind to quaternary structure epitopes at the hinge region Scott R. Royal1, Douglas G. Widman1, Boyd Yount1, Jesica A.
between domains I and II of the viral envelope protein are responsible for Swanstrom1, Carlos A. Sariol2, Aravinda M. deSilva1, William B.
DENV neutralization. In the present study we investigated the properties of Messer3, Ralph S. Baric1
neutralizing antibodies produced during a secondary infection. Following 1
University of North Carolina, Chapel Hill, NC, United States, 2University
a secondary infection, people develop neutralizing/protective antibodies of Puerto Rico, San Juan, Puerto Rico, 3Oregon Health Sciences University,
to multiple serotypes including serotypes that have not infected the Portland, OR, United States
individual. An antibody depletion technique using beads coated with It is estimated that over 300 million individuals are infected with
purified virus was used to measure levels of serotype specific and cross dengue virus (DENV) each year, yet a detailed understanding of the
reactive antibodies and their relative contribution to neutralization. We humoral response to infection is poorly understood. Recent clinical
observed two types of responses: in some sera, dengue virus neutralization trials of tetravalent DENV vaccine platforms have shown that eliciting a
was dominated by cross reactive antibodies, whereas in other sera both balanced and robust immune response against all 4 DENV serotypes has
type-specific and cross-reactive antibodies contributed to neutralization. proven difficult. Within each DENV serotype exist multiple genogroups;
Thus, unlike primary sera, secondary sera contain antibodies that cross however the breadth of serotype-specific immune responses across
neutralize and presumably cross-protect from DENVs. Ongoing studies these genogroups is not well characterized. Using reverse genetics, we
with recombinant DENVs and human monoclonal antibodies indicate these have developed infectious clone (IC) systems for all 4 DENV serotypes
allowing for the generation of recombinant DENV (rDENV) for use as
novel reagents for studying determinants of DENV-specific immune
responses. Using this technology we have created chimeric rDENV that 630
express envelope (E) genes derived from variant genogroups within DENV
serotypes 3 and 4 as well as a sylvatic DENV4 strain within the context INTERACTION OF A DENGUE-SPECIFIC CD8+ T CELL
of our DENV IC backbones . We examined immune responses from NS1 EPITOPE WITH KIR3DL1 ON NK CELLS REVEALS AN
naturally infected persons and experimentally inoculated non-human UNDERAPPRECIATED ROLE FOR NK CELLS IN IMPACTING
primates (NHP) using these rDENV strains to characterize neutralization DENGUE DISEASE SEVERITY
breadth across genogroups. Additionally, we have also identified critical
epitopes localizing to the E domain I/II (EDI/II) hinge region that are Elizabeth Townsley1, Geraldine O'Connor2, Cormac
critical components of serotype-specific neutralization responses. rDENV Cosgrove3, Marcia Woda1, Mary Co1, Stephen J. Thomas4,
were generated by transplanting these epitopes between serotypes, and Siripen Kalayanarooj5, In-Kyu Yoon6, Ananda Nisalak6, Anon
NHP were inoculated to examine immune responses elicited. These data Srikiatkhachorn1, Sharone Green1, Henry A. Stephens7, Mary
showed NHPs had high serotype-specific antibody titers to the EDI/II hinge Carrington2, Daniel McVicar2, Galit Alter3, Alan L. Rothman8,
epitope; however the breadth of this response was unknown. Using our Anuja Mathew1
intraserotypic E chimeras, we characterized the extent to which these NHP 1
University of Massachusetts Medical School, Worcester, MA, United
sera neutralized other genogroups within each serotype. We show here States, 2National Cancer Institute, Frederick, MD, United States, 3Ragon
these results detailing intergenotypic neutralization by naturally infected Institute, Boston, MA, United States, 4Walter Reed Army Institute of
humans and rDENV vaccinated NHP. These results provide insight towards Research, Silver Spring, MD, United States, 5Bangkok Children's Hospital,
the rational design of DENV vaccine candidates capable of eliciting broad Bangkok, Thailand, 6Armed Forces Research Institute of Medical Sciences,
protection against multiple genotypes within each serotype. Bangkok, Thailand, 7University College, London, United Kingdom,
University of Rhode Island, Providence, RI, United States
629 Killer immunoglobulin-like receptors (KIRs) interact with HLA class I ligands
and play a central role in the regulation and activation of natural killer
LONG-TERM MAINTENANCE OF DENGUE VIRUS-SPECIFIC (NK) cells. During our investigation of CD8 T cell responses to a highly
CELL MEDIATED IMMUNE RESPONSES conserved HLA-B57 restricted DENV epitope, we observed substantial
Alexandra Gurary1, Melissa Nagata1, Munkzhul Sukhbaatar1, Janet binding of a tetramer (B57-NS126-34 TET) to an NK enriched population.
Meeks1, Allison Imrie2 Since HLA-B57 is a known binding partner to KIR3DL1, we hypothesized
that the B57-NS126-34 TET bound KIR3DL1 on NK cells. Staining of a
University of Hawaii at Manoa, Honolulu, HI, United States, 2University of
KIR3DL1 transfectant cell line confirmed that B57-NS126-34 TET bound
Western Australia, Perth, Australia
KIR3DL1. Consistent with the function of an inhibitory KIR, incubation of
All 4 serotypes of dengue virus (DENV) can cause dengue fever (DF) and PBMC with HLA B57 expressing NS126-34 pulsed target cells suppressed
severe dengue (dengue hemorrhagic fever/dengue shock syndrome, the degranulation of only KIR3DL1+ NK cells. Furthermore, staining of
DHF/DSS), mediated by cross-reactive T cells. Infection with any of the PBMC from our clinical cohort revealed marked activation of NK enriched
4 DENV viruses is thought to confer life-long immunity to re-infection cells only in HLA B57+ patients who developed severe dengue disease
with that same serotype only, and heterotypic secondary infection is DHF. These observations reveal a previously unappreciated role for a
associated with development of severe disease. Our understanding of dengue T cell epitope in modulating NK cell function and have important
how memory T-cells may contribute to anti-DENV immunity is incomplete, implications for the pathogenesis of severe dengue disease.
and the duration of DENV-specific T-cell-mediated immune responses is
not known. We enrolled volunteers in Hawaii who recalled experiencing
a dengue-like illness in 1943, and following an outbreak of DENV-1 in
2001, the first known autochthonous transmission since 1943. Dengue A MARKED REDUCTION IN MORTALITY AMONG
is not endemic in Hawaii and in the absence of repeated exposures PARTICIPANTS IN A CLINICAL TRIAL THAT REMOVED
we were able to assess the duration, memory phenotype, and effector BARRIERS TO CARE AND IMPLEMENTED NATIONAL CASE
function of DENV-specific T cell-mediated immune responses in volunteers
who experienced a single infection 3, 9, or 60+ years previously. DENV-
specific proliferation was observed in all previously infected subjects, but Mary J. Hamel1, Martina Oneko2, John Williamson2, Maquis
not in any Control (seronegative) subject. Both CD4+ and CD8+ T-cells Sewe2, Simon Kariuki2, Frank Odhiambo2, Laurence Slutsker1,
proliferated in response to stimulation with DENV-1 however there were Kayla Laserson1
marked differences between the two subsets with respect to longevity 1
Centers for Disease Control and Prevention, Atlanta, GA, United States,
of responses. CD4+ responses were maintained at similar levels for the 2
KEMRI/Centers for Disease Control and Prevention, Kisumu, Kenya
3yr, 9yr and 60+yr groups, whereas CD8+ T-cell memory declined with
KEMRI/CDC in Kisumu Kenya is an evaluation site for the RTS,S/AS01
time, with substantially diminshed responses apparent at 9yrs; in one
vaccine trial to measure efficacy in children vaccinated at age 5-17
subject this decline was already apparent 6 yrs after infection. B*3501/
months or 6-12 weeks. Participants at this site appeared to have low
NS3500 tetramer analysis in age-matched 3yr and 60+yr subjects showed
mortality rates compared with non-enrolled children in the KEMRI/CDC
that the frequency of polyfunctional IFN-γ+/TNF-α + DENV-specific CD8+
demographic surveillance system (DSS) where the trial was conducted.
T-cells declined significantly between 3yr and 6yrs after infection, reaching
Although clinical and severe malaria were prevented, RTS,S did not show
values similar to those seen at 60+yrs, and that IFN-γ production declined
protection against mortality at 18 months follow-up. The comparator
while TNF-α was maintained. We demonstrate the long-term persistence
vaccines, meningC and rabies, prevent rare diseases, and thus were also
of dengue-specific T-cell immunity and show that the CD4+ and CD8+
unlikely to reduce mortality. We conducted a case control study to quantify
memory pools are regulated independently.
the reduction in mortality among children enrolled in the malaria vaccine
trial (cases) vs. children not enrolled, but living in the KEMRI/CDC DSS
(controls). Participants in the malaria vaccine trial were provided transport
reimbursement of 150 KSh (1.80 USD) for clinic visits. Study clinicians
followed national case management guidelines. Severely ill children were
transported to the district hospital, where adequate staffing, supplies
and equipment were made available through the trial to implement
the Kenyan National Pediatric Protocol for inpatient care. Outpatient
and hospital care were provided free of charge. Microbiology capacity
(including blood culture) was instituted. Cases and controls were matched
1:3 by date of birth (within 14 days), proximity (control within 3 km of a 633
case), and gender. Cox regression analysis was used to calculate hazard
ratio (HR). In multivariable analysis, we controlled for distance from the ASSESSMENT OF REASONS FOR POLIO VACCINE REFUSALS
clinic. In total, 1618 cases were matched to 3541 controls. Half of cases IN NORTHERN NIGERIA - OCTOBER, 2012
and controls were female and no difference in socio-economic status was
detected (p=0.12). Mean distance to the clinic was 1.9 km for cases and Charles A. Michael1, Ikechukwu U. Ogbuanu2, Chima
1.8 km for controls (p<0.01). In all, 229 deaths occurred, 31 among cases Ohuabunwo3, Oladayo Biya1, Patrick Nguku1
(1.9%) and 198 among controls (5.6%). Cases contributed 2719 person Nigeria Field Epidemiology and Laboratory Training Program, Abuja,
years (py) and controls 5335 py of observation. Mortality rates were 0.01 Nigeria, 2Centers for Disease Control and Prevention, Atlanta, Atlanta, GA,
and 0.04 deaths/py among cases and controls, respectively; the adjusted United States, 3African Field Epidemiology Network, Abuja, Nigeria
HR was 0.30 (95% CI: 0.19, 0.47) corresponding to a 70% (95%CI: 53, Oral polio vaccine (OPV) refusals during supplemental immunization
81) reduction in mortality. Children enrolled in the clinical trial at KEMRI/ activities (SIAs) contribute to the spread of polio virus in Nigeria. In
CDC experienced a marked reduction in all-cause mortality. These data September 2012, the Expert Review Committee (ERC) on Polio Eradication
suggest that considerable reduction in child mortality could be achieved and Routine Immunization in Nigeria recommended that social research be
by reducing barriers to health care and providing quality care according to conducted to better understand the reasons for polio vaccination refusals
national guidelines. among caregivers in Northern Nigeria.Following the OPV campaign in
October,2012, we conducted a cross-sectional study using semi-structured
632 questionnaires to assess polio risk perception, reasons for refusals and
perception of OPV campaigns. We interviewed caregivers who refused
REACTIVE VACCINATION IN THE PRESENCE OF DISEASE OPV for their children in two purposively selected high refusal districts
HOTSPOTS (one rural and one urban) in five north-western Nigeria states. Median
age of the 148 study participants was 39.5years, 82.4% were male, all
Andrew Azman, Justin Lessler
were Muslims and 28% had primary level education or higher. Polio risk
Johns Hopkins School of Public Health, Baltimore, MD, United States perception was low (77%), 89% of participants believed that the polio
Reactive vaccination has recently been adopted as an outbreak response vaccine was neither necessary nor helpful, and possibly harmful. Most
tool for cholera and other infectious diseases. A global revolving stockpile participants (75%) had an unfavourable or indifferent view of the polio
of cholera vaccine was recently established for emergency use, but campaigns. Religious belief was reported as an important driver of the
there is only enough vaccine globally - within and outside the stockpile participants' understanding of health and disease (70%). Most (85%)
- to vaccinate approximately one million people. When responding to study participants indicated they were more concerned about other health
outbreaks, public health officials must quickly decide who and where issues such as malaria. Caregivers refuse OPV largely due to poor polio
to distribute limited vaccine. Transmission hotspots have been discussed risk perception, unmet felt-needs and religious beliefs. Partners have
as one potential mechanism to efficiently allocate vaccine, however the therefore adopted strategies including; communication schemes aimed at
effectiveness of this approach is likely to be context dependent. We increasing awareness of polio as a health threat; educating communities
compared strategies for allocating vaccine across multiple areas with about the safety of the vaccine; engagement of religious leaders, polio
heterogeneous transmission efficiency. We constructed meta-population survivor groups and polio/pro-OPV Community Development Volunteers,
models of a cholera-like disease and compared simulated epidemics comprehensive health camps and provision of basic amenities like water
where: vaccine is targeted at areas of high or low transmission efficiency, boreholes to address identified issues. The adoption and implementation
where vaccine is distributed equitably across the population, and where of the recommendations of this study contributed to the 59% reduction in
no vaccine is used. We find that connectivity between populations, the incidence of polio in Nigeria between week 52 of 2012 and week 52
transmission efficiency, vaccination timing, and the amount of vaccine of 2013.
available all shape the performance of different allocation strategies. In
highly connected settings, like cities, when vaccinating proactively or 634
early in the epidemic, targeting limited vaccine at transmission hotspots
(i.e. areas with high transmission efficiency) is often optimal. However, CHARACTERISTICS ASSOCIATED WITH THE REGULAR
once vaccination is delayed, targeting the hotspot is rarely optimal, and CONSUMPTION OF MILK OR SOLIDS IN BREASTFEEDING
strategies that either spread vaccine between areas or those that focus on INFANTS IN MAL-ED, AN EIGHT SITE COHORT STUDY
non-hotspots will avert more cases. Although transmission hotspots may
seem like an intuitive target for outbreak control, we show that in many Stephanie A. Richard1, Ram K. Chandyo2, Estomih R. Mduma3,
situations the hotspot epidemic may proceed so fast that hotspot-targeted Cloupas Mahopo4, Bruna Maciel5, Anuradha Bose6, Ali Turab7,
vaccination will prevent relatively few cases, and vaccination shared across Mustafa Mahfuz8, Laura Murray-Kolb9, Tahmeed Ahmed8, Laura E.
areas where transmission can be sustained is often the best approach. Our Caulfield10
results suggest a general rule of thumb for vaccination in cities: reactive 1
Fogarty International Center, Bethesda, MD, United States, 2Center
distribution of vaccine across areas that can independently maintain for International Health, Bergen, Norway, 3Haydom Lutheran Hospital,
transmission is generally preferred to targeting any particular transmission Haydom, United Republic of Tanzania, 4University of Venda, Thohoyandou,
hotspot, and hotspots should only be targeted when they are thought to South Africa, 5Universidade Federal do Rio Grande do Norte, Natal,
be necessary drivers of transmission. These results provide new insights on Brazil, 6Christian Medical College, Vellore, India, 7Aga Khan University,
how to efficiently vaccinate in response to an epidemic when vaccine is Karachi, Pakistan, 8International Centre for Diarrhoeal Disease Research,
limited. Bangladesh, Dhaka, Bangladesh, 9The Pennsylvania State University,
University Park, PA, United States, 10Johns Hopkins Bloomberg School of
Public Health, Baltimore, MD, United States
The WHO recommends exclusive breastfeeding for the first 6 months of
life in order to maximize nutrient intake, increase immune function, and
decrease exposure to pathogens. We expect that mothers choose to stop
exclusive breastfeeding or introduce milks or solids based on multiple
infant (size, illness, behavior), maternal (maternal age, education, number
of live births) and environmental (food security, resources) factors. Using
data from an 8-site birth cohort study, we explored the relationship
between child, maternal and environmental characteristics and the timing
of regular consumption of milks or solids during the first six months of began to decline at 110 g/l. We found no significant association between
life. Overall, 1,967 children were included in this analysis, approximately Early Learning Composite scores and maternal Hb concentration. There
200 per study site. The median age of first regular consumption of milk appears to be an optimal range Hb concentration (88-110 g/l) between 22
or solids ranged from 41 days (Pakistan site) to 176 days (Bangladesh and 32 weeks of gestation that may be beneficial to infant gross motor
site). We used Cox proportional hazards models with time (in days) to function at age one year. These may reflect physiological hemodilution,
regular consumption of milk or solid as the outcome, including both which peaks between 22 and 32 weeks of gestation. Further studies are
fixed (sex, maternal age, parity, etc.) and time varying (weight, height, required to corroborate our findings.
illness, etc.) exposures. Higher weight-for-length (WLZ) and length-for-age
Z-scores (LAZ) were associated with later introduction of milk or solids. 636
Food insecurity, as well as illness (diarrhea, cough in the past 30 days),
were also associated with later consumption of milks and solids. Factors FOOD INSECURITY AND INDIRECT COSTS OF MEDICALLY-
related to breastfeeding initiation (colostrum, prelacteal feeding), maternal ATTENDED GASTROENTERITIS IN CHILDREN YOUNGER THAN
education, and parity were not strongly associated with timing of regular FIVE YEARS OF AGE IN A "POST-ROTAVIRUS" SETTING
consumption of milks and solids. We included interactions between time
and WLZ, LAZ, and cough and found that the protective effect of higher Laura B. Rapoport1, Fabiola D. Colquechagua Aliaga2, Andrew J.
values of WLZ, LAZ, and cough decreased over time. These preliminary Mirelman1, Milagros G. Tejada Santiesteban2, Brisaida M. Rafael
results indicate that the diet of the breastfed child may be altered Cordova2, Dante A. Figueroa Quintanilla3, Robert H. Gilman4,
according to the child's size or health status. These data will improve Sarah-Blythe Ballard1
our understanding of the site-specific and overall timing of the regular
Department of International Health, Johns Hopkins Bloomberg School of
consumption of milk and solids as it relates to child and maternal factors, Public Health, Baltimore, MD, United States, 2Asociacion Benefica PRISMA,
and will allow us to make recommendations regarding how to incorporate Lima, Peru, 3Instituto Nacional de Salud del Nino, Lima, Peru, 4Laboratorios
breastfeeding in future analyses in order to avoid the potential for reverse de Investigacion y Desarrollo, Universidad Peruana Cayetano Heredia,
causality. In addition, we can explore the factors associated with early Lima, Peru
regular consumption of milk and solids in these populations in order to Several vaccines are in development against norovirus (NV), the leading
understand and appropriately evaluate their impact on growth and overall cause of pediatric diarrhea after rotavirus. In order to analyze the cost-
health. effectiveness of potential vaccines, the direct and indirect costs of diarrhea
must be ascertained. Since indirect costs have the potential to be high,
635 accurate estimations of these costs are vital. In order to estimate the
economic impacts of NV diarrhea, this study was designed to estimate
HEMOGLOBIN CONCENTRATION DURING PREGNANCY the indirect and out-of pocket direct costs of a single diarrheal episode
AND INFANT COGNITIVE AND MOTOR DEVELOPMENT: A in a population with 90% rotavirus vaccine coverage. Children younger
PROSPECTIVE COHORT STUDY than five years of age presenting with diarrhea to the national children's
hospital in Lima, Peru (Instituto Nacional de Salud del Niño) were
Michael O. Mireku1, Leslie L. Davidson2, Ghislain K. Koura3, screened for diarrhea according to the World Health Organization's case
Smaïla Ouédraogo4, Michael J. Boivin5, Xu Xiong6, Manfred M. definition. Children meeting the case definition whose caregivers agreed
Accrombessi7, Achille Massougbodji8, Michel Cot7, Florence to participate were actively followed with daily phone calls from the time
Bodeau-Livinec1 of presentation until the conclusion of the diarrhea episode. The caregiver
French School of Public Health (EHESP), Rennes, France, 2Columbia was then interviewed by a health care provider about the indirect costs of
University, New York, NY, United States, 3Union Internationale Contre la the diarrhea episode using a survey adapted from the WHO's indirect costs
Tuberculose et les Maladies Respiratoires, Paris, France, 4Centre Hospitalier of diarrhea survey tool and the United States Department of Agriculture
Universitaire Yalgado Ouédraogo, Ouagadougou, Burkina Faso, 5Michigan food security screening tool. Minimum wage was used to estimate the
State University, East Lansing, MI, United States, 6Tulane University School cost of lost productivity. Costs were converted to US dollars. The caregivers
of Public Health and Tropical Medicine, New Orleans, LA, United States, of 30 children younger than five years of age with diarrhea completed the
Institut de Recherche pour le Développement, Paris, France, 8Université interview. The median monthly household income was $306 (IQR: 252-
d'Abomey-Calavi, Cotonou, Benin 360). The median estimated total indirect cost of the diarrheal episode was
There have been several studies on the consequences of anemia during $75 (IQR: 54-117). The median number of hours of housework lost was 5
pregnancy but to date, very little is known about the impact of prenatal (IQR: 4-18). Thirty three percent of caregivers worked outside the house.
anemia on infant neurocognitive function. The objective of this study Of those, the median number of workdays lost was 3 (IQR: 1.5-4.5). The
was to assess the impact of anemia during pregnancy on the cognitive median total out of pocket expense for one diarrheal episode was $85
and motor functions of one-year-old children in Benin. Our prospective (IQR: 65-126), including $22 (IQR: 14-41) for drugs and medical supplies.
cohort study included one-year-old children born to women enrolled at As a result of time and money lost due to the diarrheal episode, 70% of
their first antenatal care (ANC) visit, before 29 weeks of pregnancy, within caregivers reported being worried about not having enough money to
the MiPPAD trial comparing sulfadoxine-pyrimethamine and mefloquine. buy food, and 17% reported not having money to buy food. Significant
Hemoglobin (Hb) concentrations of pregnant women were determined indirect costs are incurred from a single episode of acute pediatric
from venous blood samples collected at first and second ANC visits of at diarrhea, and these costs contributed to food insecurity in a segment
least, one-month interval and at delivery. Women were prescribed oral of this population. Indirect costs should be considered in vaccine cost-
iron, folic acid and anthelminthics as part of the ANC package in Benin. effectiveness estimates and guide decisions about the introduction of new
A total of 635 children (76.7% of eligible children) were assessed for childhood vaccines.
cognitive and motor functions, using the Mullen Scales of Early Learning
(MSEL), at twelve months of age by trained research nurses. Prevalence
of anemia decreased from 67.8% at first ANC visit to 40.1% at delivery.
Children of mothers who were anemic at second ANC visit had better
gross motor function (an estimated mean increase of 2.4 points, 95%
Confidence Interval, CI, 0.1 to 4.7). We observed a significant negative
quadratic relationship between infant gross motor function and Hb
concentration at first ANC visit for women of gestational age greater
22 weeks (p=0.025). Thus, infant gross motor scores increased with
increasing maternal Hb concentration until 88 g/L where it plateaued and
637 638
Wenbao Zhang1, Jun Li1, Hui Wang1, Zhuangzhi Zhang1, Baoxin
J. Joseph Lawrence1, Toyin Ajayi2, Kojo Yeboah-Antwi3, Shi1, Huajun Zhen2, Yan Zhou2, Shengyue Wang2, Donald P.
William B. MacLeod3, Godfrey Biemba4, Karsten Lunze5, Kebby McManus3, Hao Wen1, Wenbao Zhang1
Musokotwane6, Simon Mutembo6, Duncan Earle7, Richard W. 1
The First Affiliated Hospital of Xinjiang Medical University, Urumqi,
Steketee8, Chilunga Puta7, Davidson H. Hamer9 China, 2Shanghai Ministry of Science and Technology, Key Laboratory of
Zambia Center for Applied Health Research and Development, Lusaka, Health and Disease Genomics, Chinese National Human Genome Center,
Zambia, 2Center for Global Health and Development, Boston University Shanghai, China, 3Molecular Parasitology Laboratory; QIMR Berghofer
and Department of Family Medicine, Boston University Medical Center, Institute of Medical Research, Queensland, Australia
Boston, MA, United States, 3Department of Global Health, Center for Despite the substantial efforts have been made to control echinococcosis
Global Health and Development, Boston University, Boston, MA, United there is a clear need for new tools in its prevention. Dogs are pivotal in
States, 4Zambia Center for Applied Health Research and Development Echinococcus granulosus transmission and we contend that interruption of
and Boston University Center for Global Health and Development, Lusaka, the parasite life cycle in the definitive host stage provides a very practical
Zambia, 5Boston University School of Medicine, Boston, MA, United States, and cost-effective vaccination strategy. Specific or differential genes
Southern Provincial Medical Office, Ministry of Health, Choma, Zambia, expressed in the scolex of adult worms are likely the vaccine targets for
Malaria Control and Evaluation Partnership in Africa (MACEPA), PATH, dogs against E. granulosus. To identify the genes, adult E. granulosus
Lusaka, Zambia, 8Malaria Control and Evaluation Partnership in Africa worms aged two weeks were collected from experimentally infected dogs.
(MACEPA), PATH, Seattle, WA, United States, 9Center for Global Health The worms were fixed and stored in ethanol. Each of the worms was cut
and Development, Boston University and Zambia Center for Applied into two parts, head and neck region. mRNA were extracted from the two
Health Research and Development, Lusaka, Zambia parts respectively and RNA-seq technique was used to precisely quantify
Given the decline in malaria prevalence in many areas in sub-Saharan transcript levels in the two parts. A real time PCR was used to confirm
Africa, fever in children can no longer be treated presumptively as malaria. the gene expression in the tissues. We identified 953 genes specifically
The purpose of this evaluation was to examine health system capacity or differentially expressed in the scolex of E. granulosus. Most of the
and clinicians' ability to accurately diagnose and treat pediatric febrile up-regulated genes are novel, indicating these genes may compose a
disease in three districts in Zambia with varying malaria endemicity. We network in regulating specific function of worm head, and they may play
conducted health facility surveys, health worker (HW) interviews, and an important role in settlement of E. granulosus in dog intestinal surface.
observed patient-provider interactions for children under the age of 5 Known genes include calcium-transport, dynein light chain, early growth
who presented with history of fever in the previous 48 hours. Quality of response protein 2-like isoform 4, myosin heavy chain and transmembrane
the clinical evaluation was assessed using the Zambian Ministry of Health protein 144. Interestingly, neuropeptide f was highly expressed in the head
IMCI guidelines. We observed 161 patient-provider interactions and of E. granulosus. The peptide acts as a neurotransmitter in the central
interviewed 53 HWs at 24 health facilities with regard to their assessment nervous system(CNS), indicating the peptides may involve in the early CNS
of danger signs. Inability to feed was the most commonly assessed (53%) of the parasite. In addition, lanine aminotransferase was also up-regulated
danger sign, followed by persistent vomiting (47%), convulsions (31%) in the head, which may involve in nervous development in the early stage
and lethargy (29%). All four danger signs were assessed in just 8% of adult worm. As scolex is an important worm part for attachment, the
(13/161) of children. None of the HWs conducted all, and less than 15% specific and differential genes are likely the targets for drug and vaccine
performed half of, the physical examination and history taking items as development against adult E. granulosus.
prescribed by IMCI guidelines. All facilities had capacity to test for malaria
with either RDT or microscopy, but only 57% of children presenting with 639
fever were tested. Clinical diagnosis of pneumonia was also incomplete.
Less than one third of children with cough or difficulty breathing had their A HIGH SENSITIVITY DOT-BLOT FOR THE DIAGNOSIS OF
respiratory rate counted. Adherence to the malaria treatment protocol HEPATIC CYSTIC ECHINOCOCCOSIS USING WHOLE BLOOD
was high, as all patients who were RDT positive received ACT, while only SAMPLE
1 of 85 RDT-negative received ACT. However, none of the pneumonia-
diagnosed children received the recommended treatment (amoxicillin),
Mara Mariconti1, Francesca Tamarozzi2, Francesca Rinaldi2,
and 48% of those with fast breathing (WHO-defined, non-severe
Jacopo Giovanni Nicoletti2, Francesca Genco3, Valeria Meroni3,
pneumonia) did not receive appropriate treatment. Identification of danger
Enrico Brunetti2
signs, diagnosis and treatment of febrile illness were not conducted in
IRCCS Policlinico San Matteo, PAVIA, Italy, 2Department of Clinical,
accordance with IMCI guidelines. There is an urgent need for interventions Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy,
to improve management of pediatric febrile illness at the health facility
IRCCS Policlinico San Matteo, Pavia, Italy
level in Zambia. The diagnosis of hepatic cystic echinococcosis (CE) is based on
ultrasonography (US) and confirmed by serology. However, a high
proportion of inactive cysts, as well as early CE1 cysts, remain seronegative
with conventional serodiagnostic tests, which poses diagnostic problems
where no pathognomonic signs of CE are present on US examination. We
present preliminary results of the performance of a whole blood dot-blot
with human hydatid cyst fluid (HCF) especially in patients with hepatic
CE who are seronegative with routine diagnostic test. HCF was collected
from a CE patient after percutaneous aspiration of an active CE1 liver
cyst. Dot-blot membranes were prepared with 50ng of total proteins, and
whole blood samples were diluted 1:2000. We tested a total of 34 whole
blood samples, 24 of which from CE patients with active, transitional and
inactive cysts and 10 from volunteers and patients with non-parasitic cysts
(control group). All CE patients with different cyst stages recognized the
proteins present in the HCF, while all samples in the control group did not
recognize any proteins.These preliminary results are encouraging and we Primarily cystoid, intermediate (with / without more solid portions at the
plan to evaluate our test on a higher number of CE patients and patients edge), IIIb. Primarily cystoid widespread (with / without more solid portions
with other helminthic infections. This diagnostic test could be useful for at the edge), IV. Small-cystoid / metastatic* and V. Mainly calcified. Except
the development of a rapid finger prick test for the serodiagnosis of CE for the "primary morphology" type V., following patterns of calcification
in remote endemic areas. Further identification of the different antigens were attributed additionally: without calcifications; with feathery
recognized will support the development of diagnostic tools that could calcifications; with focal (p.r.n. central - just possible with*) calcifications;
improve the sensitivity of CE diagnosis. with diffuse calcifications; with calcifications primarily at the edge. The
various classification patterns are demonstrated by image examples. The
640 proposed CT-morphological classification shall facilitate the interpretation
of lesions due to a hepatic alveolar echinococcosis. This could help to
LONG-TERM FOLLOW-UP OF PATIENTS WITH ALVEOLAR interpret different clinical courses better and shall assist in the context of
ECHINOCOCCOSIS IN GERMANY scientific studies to improve the comparability of CT findings.
Beate Gruener1, Petra Kern2, Benjamin Mayer2, Rainer Muche2,
Peter Kern3 642
University Hospital Ulm, Ulm, Germany, 2University Ulm, Department of COMPARING GROUP MEANS AND INDIVIDUAL RESPONSES
Epidemiology and Medical Biometry, Ulm, Germany, 3University Hospital TO TREATMENT OF SOIL-TRANSMITTED NEMATODES
Ulm, Department of Infectious Diseases and Clinical Immunology, Ulm, WITH BENZIMIDAZOLE DRUGS: A POOLED ANALYSIS OF
Germany INDIVIDUAL PATIENT DATA
From 1992 to 2011, 312 patients with alveolar echinococcosis (AE) were
diagnosed and treated at the specialized outpatient clinic of the Ulm Piero L. Olliaro1, Aïssatou Diawara2, Benjamin Speich3, Jennifer
University. Demographic and clinical data were assessed and updated from Keiser3, Carli M. Halpenny4, Marco Albonico5, Jimmy Kihara6,
the patients' first visits. At that time, 74.7% of the patients were alive, Roger K. Prichard4
12.8% had died, and 12.5% were lost to follow-up. Patients were treated 1
World Health Organization, Geneva, Switzerland, 2New York University
either by surgery with subsequent benzimidazole (BZM) prophylaxis for at Abu Dhabi, Abu Dhabi, United Arab Emirates, 3Swiss Tropical and Public
least 2 years (n=133), or continuous BZM treatment in case of inoperability Health Institute, Basel, Switzerland, 4Institute of Parasitology, McGill
(n=157). At first diagnosis, 17 patients had inactive lesions. Imaging and University, Sainte-Anne-de-Bellevue, QC, Canada, 5Fondazione Ivo de
treatment schemes changed during the 20 years of observation. AE was Carneri, Torino, Italy, 6Eastern and Southern Africa Center of International
diagnosed more often by chance in patients from 2000 onwards (48.0%) Parasite Control, Kenya Medical Research Institute, Nairobi, Kenya
than before 2000 (28.7%). Since 2000, the disease was detected more Monitoring anthelmintic treatment efficacy is important to detect
frequently with lesions at PNM stages I and II (27.0% vs. 15.8%) according suboptimal response where drug pressure is high. The recommended
to WHO classification; as a consequence, radical resections were feasible method is egg reduction rate (ERR): percentage reduction in the mean
in more patients (57.7% vs. 20.0%). Surgical resections were less frequent number of eggs per gram (EPG) in excreta post- vs pre-treatment
since 2000 (38.2% vs. 50.5%). Since 1993, PET-CT-scans with 18F-FDG calculated using arithmetic rather than geometric mean (ERRam, ERRgm).
were used routinely to visualize larval activity at time of diagnosis. For We compared these group mean outcomes to individual patient outcomes:
follow-up, the rationale for performing a PET-CT every other year was to centile distribution of individual ERR (ERRic) from which we derived:
monitor the effect of continuous BZM treatment, and to detect relapses proportion cured (cure rate, CR), or with reduced EPG (rEPG) or no change/
after surgery. At the end of follow-up, medical treatment had been increased EPG (nEPG); and median ERR (mERR). We analysed trials which
interrupted for 25.3% of the patients. Of 56 patients with R0 resection, treated Ascaris lumbricoides (AL), Trichuris trichiura (TT) or hookworms
42 had stopped medical treatment. At their last visit, the disease status of (HW) with benzimidazoles (1832 subjects): four trials of albendazole
73.1% of the patients was judged as stable, in 5.1% as progressive while (ABZ: n= 613; AL: n=121, TT: n=297, HW: n=195); two of mebendazole
under medical treatment. AE was considered as being cured in 15.7% of (MBZ: n=1219, AL: n=174, TT: n=513, HW: n=532). Both drugs were
the patients.The 5- and 10-years' survival rates in this cohort were 96.8% very effective on AL: CR were 90.9% with ABZ and 94.2% with MBZ.
and 90.5%. Data analysis of two decades' experience in the management Treating TT with ABZ gave CR=15.4%, rEPG=48.8%, nEPG=35.7% and
of AE showed that best care can be provided to the patients when they mERR=39%; and MBZ gave CR=22.4%, rEPG=58.1%, nEPG=19.4%;
present at an early stage of the disease. As the disease is rare, expertise is mERR=76%. Treating HW with ABZ gave CR=69.2%, rEPG=23.1%,
best acquired in a single specialized institution; a benefit for the patients nEPG=7.7, mERR=100%; MBZ gave CR=14.1%, rEPG=51.7%,
results from strict adherence to the WHO treatment recommendations. nEPG=34.1%, and mERR=56%. Efficacy estimates expressed as ERRgm
were systematically higher the ERRam for both drugs. As opposed to
641 group mean estimates ERRam/gm, ERRic within one analysis, describes
better the distribution of individual responses (centile distribution) and
NEW CT-CLASSIFICATION OF HEPATIC ALVEOLAR calculates proportions cured, with partial or no response, and median ERR;
ECHINOCOCCOSIS it should be tested on larger datasets to pinpoint changes in patterns of
response and poor responders.
Tilmann Graeter, Wolfgang Kratzer, Suemeyra Oeztuerk, Tanja
Kaltenbach, Mark Martin Haenle, Peter Kern, Beate Gruener
University Hospital Ulm, Ulm, Germany
Computed tomography, mostly combined with PET, provides one of the
most important diagnostic tools in suspected alveolar echinococcosis.
Aim of the study was to establish a new CT-classification based on a large
patient collective with confirmed hepatic alveolar echinococcosis. In 224
patients, CT-morphology of liver lesions due to an alveolar echinococcosis
was retrospectively examined. The findings were grouped into the new
classification scheme. Within the classification a lesion was dedicated to
a "primary morphology" as well as to a "pattern of calcification". The
primary morphology distinguishes following types: I. Diffuse infiltrating
(with / without cystoid portion), II. Primarily circumscribed tumor-like (with
/ without cystoid portion and with / without offshoot at the edge), IIIa.
643 were subsequently used to probe L3 larval extracts resulting in a strong
specific recognition of a 12kDa antigen (As12). This antigen is present on
WATER AND SANITATION TARGET DIFFERENT SOIL the surface of infective L3 larvae and is shed actively. As12 appears to be
TRANSMITTED HELMINTHES ACCORDING TO THEIR ROUTE a glycolipid that contains phosphorylcholine, and it cannot be visualized
OF INFECTION by protein staining. Furthermore, As12 is highly resistant to different
enzymatic and chemical treatments. This molecule could be of significant
Alejandro J. Krolewiecki1, Adrana Echazu2, Diego Cruz3, Rosana importance to the survival of the parasite during the initial stages of
Ruiz4, Pamela Cajal2, Marisa Juarez2, Ruben Cimino2, Paola infection. Further studies are needed to investigate its molecular nature
Vargas2, Nicolas Caro2, Luis Arias5, Daniela Bonanno1, Viviana and its role at the parasite-host interface.
Heredia5, Gladys Paredes5
Ministerio de Salud de la Nacion, Buenos Aires, Argentina, 2Universidad 645
Nacional de Salta, Oran, Argentina, 3Fundacion Mundo Sano, Tartagal,
Argentina, 4Fundacion Mundo Sano, Buenos Aires, Argentina, 5Ministerio FINE-SCALE SPATIAL AND TEMPORAL EVOLUTION OF WEST
de Salud Publica de Salta, Tartagal, Argentina NILE VIRUS IN CALIFORNIA
Soil transmitted helminthes (STH) are a group of parasites of public health Nisha K. Duggal1, William K. Reisen2, Greg D. Ebel3, Aaron C.
relevance due to its burden of disease and prevalence. The global strategy Brault1
of the World Health Organization for the control of the morbidity related 1
Centers for Disease Control and Prevention, Fort Collins, CO, United
to STH includes preventive chemotherapy but also highlights the need
States, 2University of California Davis, CA, United States, 3Colorado State
for developmental improvements in the living conditions of affected
University, Fort Collins, CO, United States
populations. As part of a project for the development of strategies for
the control of STH in northwestern Argentina, a survey was performed in West Nile virus (WNV) is an arbovirus that was first reported in North
randomly selected families of Wichii aboriginal communities of Tartagal America in 1999 and, by 2003, had spread nearly 3,000 miles from New
with known high endemic prevalence of STH; socio-demographic York to southern California. The spread of WNV across the U.S. has been
information originating in the primary care routine sanitary data forms shown to be dependent on long-range movements, though sporadic
was incorporated into the database. The surveys were designed to include sampling and an ascertainment bias from selecting isolates not associated
a representative randomized sample that included whole family groups. with disease in humans may have affected these analyses. In addition,
STH were surveyed through examination of single fresh stool specimens methods of viral overwintering and viral genetics associated with viral
with 5 methods and an ELISA assay for Strongyloides stercoralis based on spread are not well understood. Herein, we report sequences for more
NIE antigen. In a community of 2914 individuals, 229 stool samples and than 125 WNV isolates collected from 15 counties of California. These
255 serum samples were evaluated and revealed an overall prevalence of isolates were made from mosquito pools collected as part of routine
STH of 54% with species specific prevalences of 49% for hookworms, surveillance by the California Vectorborne Disease Surveillance System
41% for S. stercoralis, 1% for Ascaris lumbricoides and 0.5% for Trichuris from 2003 - 2012. This unique dataset allows inference of fine-scale
trichiura. The sanitary conditions of this communities revealed improved spatial and temporal movements of WNV. Using the Bayesian MCMC
drinking water availability in 98% of the individuals which contrasts with a approach implemented in BEAST, we performed phylogeographic analyses
mere 2.3% with improved sanitation (unimproved pit latrines 94%, open and demonstrate that 3 independent introductions of WNV (2 WN02
defecation 1.4%, no data 1.9%). These results highlight the distinctly strains and 1 SW03 strain) occurred in California between 2002 and
contrasting prevalence between STH with life cycles that infect through 2003 via the Coachella and Sacramento Valleys. The two genotypes of
skin penetration of filariform larvae (hookworms and S. stercoralis) versus WNV have remained in co-circulation in California from 2003 to 2012,
those that infect through the oral ingestion of embryonated eggs (A. though SW03 viruses were primarily restricted to southern California.
lumbricoides and T. trichiura) according to environmental conditions. In An association between WNV genotype and WNV neuroinvasive disease
the communities described in this report the lack of adequate sanitation (WNND) in humans has not been consistent, as both WNV genotypes
favored skin penetrators but the availability of improved water blocked have circulated in counties with high and low WNND incidence. Multiple
those transmitted trough oral ingestion. Life cycles determine risk factors examples of short-range movements of WNV across a few hundred miles,
and the interplay of these elements should guide control measures. as well as geographic constraint of WNV strains within a single region
for up to 8 years, suggest viral transmission has been driven by resident,
644 rather than migratory, birds. In addition, while most mosquito pools
containing infectious virus were collected in summer months, 2 viruses
DETECTION AND CHARACTERIZATION OF AN from mosquitoes collected during winter months were phylogenetically
IMMUNODOMINANT ANTIGEN PRESENT ON THE SURFACE consistent with continued viral transmission as an overwintering
OF ASCARIS L3 LARVAE mechanism for WNV. These data show that dense sampling across space
and time can help to explain basic biological and ecological properties of
Johnny Vlaminck1, Jozef Vercruysse2, Peter Geldhof2 WNV transmission.
Washington University, St. Louis, MO, United States, 2Ghent University,
comparison with WNV tropism in mammals, we hypothesized that early 648
WNV replication in AMCRs is driven specifically by replication in circulating
monocytes. Therefore, peripheral blood mononuclear cells (PBMC) were RESTRICTION OF 2'-O METHYLATION DEFICIENT WEST NILE
isolated from AMCRs and infected with WNV in an ex vivo culture system. VIRUS IN INSECTS
The degree of replication attained by various WNV strains and mutants in
this ex vivo system recapitulated their relative viremia and pathogenicity in James D. Brien1, Sheri L. Hanna2, Irma Sanchez-Vargas3, Gregory
vivo in AMCRs. Flow cytometric analysis suggested that the cells infected D. Ebel3, Michael S. Diamond1, Sara Cherry2
in ex vivo PBMC culture were predominantly monocytes. A WNV virus 1
Washington University, St. Louis, MO, United States, 2University of
engineered to express target sequences for miR223, a miRNA found Pennsylvania, Philadelphia, PA, United States, 3Colorado State University,
specifically in myeloid lineage cells, was generated to assess the specific Fort Collins, CO, United States
role of infectivity of these cells for modulating in vivo avian virulence Interferon (IFN) induced proteins with tetratricopeptide repeats (IFITs) were
phenotypes. This cell-restricted recombinant virus failed to replicate in recently identified as mammalian sensor molecules that recognize non-self
AMCR ex vivo PBMC cultures, demonstrating the myeloid lineage as the viral RNA lacking 2'-O methylation at their 5' end and selectively block
source of viral replication in the leukocyte preparations. Furthermore, the translation. Similar to mammals, the host mRNA of insects is methylated at
myeloid-restricted virus exhibited peak viremias in AMCRs 200-fold lower both the N-7 and 2'-O positions yet insects lack any known IFN response
than the parental WNV strain or a control virus expressing a mosquito pathway or apparent IFIT gene orthologs. Here, we show that a mutant
miRNA target sequence. Additionally, mortality of the miR223 target West Nile virus (WNV) lacking 2'-O methyltransferase activity (WNV-NS5-
sequence WNV was 50% with an average survival time of approximately E218A) is attenuated in mosquito cells and intact mosquitoes. Wild type
ten days, while the wild type virus yielded 100% mortality with birds WNV (WNV-WT) grows to approximately 2 logs higher titer than WNV-
succumbing within approximately five days. Thus, several lines of evidence NS5-E218A in both C6/36 and AAG2 mosquito cells and WNV-WT had
point to the importance of leukocytes, including monocytes, in WNV an increased infection rate and higher titer of infection in Culex tarsalis
infection of AMCRs. The ex vivo PBMC culture system may be a useful mosquitoes at day 3 and 5 post infection in comparison to WNV-NS5-
model for pathologic assessment of WNV strains, and can be used to E218A. These results suggest that WNV-NS5-E218A is restricted by a novel
further elucidate the mechanism of action of viral mutations that affect effector pathway that recognizes the loss of 2'-O methylation, analogous
WNV host competence in avians. to our observations in mammals; alternatively, insects use 2'-O methylation
for efficient translation and thus, restrict non-self RNA lacking this
647 modification. To identify the genes and pathways responsible for restricting
WNV-NS5-E218A, a genome-wide RNAi screen that targets 12,870
ROLE OF TNF-α RECEPTOR 2 IN WEST NILE VIRUS INFECTION Drosophila genes was performed. We identified 140 genes within the
Moti L. Chapagain1, Maile O'Connell2, Douglas M. Watts3, Vivek primary screen that increased infection of WNV-NS5-E218A when silenced.
R. Nerurkar2 Of these 140 genes we are currently pursuing four genes with mammalian
homologs that increase WNV-NS5-E218A infection to a greater extent
Chitwan Medical College, Bharatpur, Chitwan, Nepal, 2University of
than WNV-WT. We will discuss how these genes preferentially restrict WNV
Hawaii, Honolulu, HI, United States, 3University of Texas at El Paso, El Paso,
lacking 2'-O methylation in insect cells.
TX, United States
West Nile virus (WNV) is the most common cause of arboviral encephalitis 649
in the USA. Several lines of evidence suggest that production and release
of TNF-α is one of the early cellular events in WNV infection. While the SUBSTITUTION OF THE PREMEMBRANE AND ENVELOPE
role of TNF-α receptor 1 (TNF-R1) in WNV infection is controversial, there PROTEIN GENES OF MODOC VIRUS WITH THE
are no studies that have evaluated the role of receptor 2 (TNF-R2) in HOMOLOGOUS SEQUENCES OF WEST NILE VIRUS
WNV-associated neuropathogenesis. We hypothesized that TNF-α acting GENERATES A CHIMERIC VIRUS THAT REPLICATES IN
through TNF-R2 promotes survival of WNV-infected neurons and immune
cells by counteracting WNV-induced apoptosis and enhancing regulatory
T cells (Tregs) functions. Therefore, TNF-R2 knock out (KO) mice infected Bradley J. Blitvich1, Rungrat Saiyasombat1, W. Allen Miller1, Peter
with WNV will have more severe disease and higher mortality than the J. Bredenbeek2, Jimena Carrillo-Tripp1
wild type (WT) mice. The objective of this study was to examine the role 1
Iowa State University, Ames, IA, United States, 2Leiden University Medical
of TNF-R2 signaling in protecting WNV-infected mice. Age- and gender- Center, Leiden, Netherlands
matched 8-12 weeks old, KO and WT (C57Bl/6) mice were inoculated with
Most known flaviviruses, including West Nile virus (WNV), are maintained
100 or 10 plaque forming units (pfu) of WNV NY-99 strain and monitored
in natural transmission cycles between hematophagous arthropods and
daily for 3 weeks. Mice survival was analyzed using Log-rank (Mantel-Cox)
vertebrate hosts. Other flaviviruses such as Modoc virus (MODV) and Culex
tests and viremia was quantitated by quantitative reverse transcriptase
flavivirus (CxFV) have host ranges restricted to vertebrates and insects,
real-time PCR (qRT-PCR). When infected with 100 pfu of WNV, 97% of KO
respectively. The genetic elements that condition the differential host
mice succumbed to death whereas 31% WNV-infected WT mice survived
ranges and transmission cycles of these viruses have not been identified.
(N=29 in each group, Chi-square 14.38, df 1, p= 0.0001). While WT mice
In this study, fusion-PCR was used to replace the capsid (C), premembrane
had lower viremia (7±3x103 vs. 4±7x104 pfu equ/mL) and slightly longer
(prM) and envelope (E) genes and the prM-E genes of a full-length MODV
median survival time (11 days vs. 10 days), these differences were not
infectious cDNA clone with the corresponding regions of WNV and CxFV.
significant. Interestingly, when infected with 10 pfu of WNV, there was no
Fusion products were directly transfected into baby hamster kidney-derived
difference in the survival between WT and KO mice suggesting the role of
cells that stably express T7 RNA polymerase. At 4 days post-transfection,
TNF-R2 while is critical in heavy infection, it may not have any role in low
aliquots of each supernatant were inoculated onto vertebrate (BHK-21 and
dose WNV-infection. Therefore, because of limited distribution of TNF-R2
Vero) and mosquito (C6/36) cells which were then assayed for evidence
in immune, hematopoietic and neuronal cells that are primary targets
of viral infection by RT-PCR, Western blot and plaque assay. Chimeric virus
of WNV, specifically augmenting the TNF-R2 could be a better and safer
was recovered in cells transfected with the fusion product containing the
therapeutic strategy in heavy WNV infection.
prM-E genes of WNV. The virus could infect vertebrate but not mosquito
cells. The in vitro replication kinetics and yields of the chimeric virus were
similar to MODV but the chimeric virus produced larger plaques. Chimeric
virus was not recovered in cells transfected with any of the other fusion
products. In conclusion, our data indicate that genetic elements outside CI 3.6-6.5%) participants were flavivirus seropositive (aged 3-85 years).
of the prM-E gene region of MODV condition its vertebrate-specific Prevalence differed significantly among villages (p<0.001) with higher risk
phenotype. in Sabenale (19%), Golabele (10%) and Tumtish (9%), and lower risk in
Gedilun (4%), Korahindi (2%) and Matarba (1%). Children (<16 years
650 old) were less likely to be seropositive than adults (p<0.001). Women
tended to be less at risk than men (p=0.057). Seropositivity was associated
THE YELLOW FEVER ICEBERG: THE PROBABILITIES OF MILD, with poor measured visual acuity (p=0.026) and the following reported
SEVERE AND FATAL DISEASE FOR PEOPLE INFECTED WITH lifetime historical symptoms: red eyes (p=0.005), poor vision (p=0.038),
YELLOW FEVER VIRUS eye pain (p=0.005), photophobia (p<0.001), backache (p<0.001), malaise
(p<0.001), and sleepiness (p=0.045). Seropositivity was also associated
Michael Johansson1, Pedro F. Vasconcelos2, J. Erin Staples3 with home flooding (p=0.0215). Flavivirus exposure is rare in northeastern
Centers for Disease Control and Prevention, San Juan, PR, United States, Kenya, but more common among adults than children. Differences in
Instituto Evandro Chagas, Ananindeua, Brazil, 3Centers for Disease seroprevalence between residents of nearby villages with similar ecology
Control and Prevention, Fort Collins, CO, United States may be due to varied mosquito control practices or economic factors.
Yellow fever virus, like other pathogens, only causes disease in a Flavivirus exposure is associated with many historical visual symptoms
proportion of individuals it infects. Severe illness and death represent the and poor measured visual acuity. Despite low prevalence and no reported
tip of the iceberg relative to asymptomatic and mild infections, which is outbreaks, ongoing interepidemic transmission is demonstrated by
more critical for determining the overall disease burden and prevalence documentation of seropositive children.
of infection. We compiled data on asymptomatic infections, mild disease,
severe disease, and fatalities from eleven outbreaks affecting hundreds 652
to thousands of people in Africa and South America between 1969 and
2011. We defined severe disease as fever with jaundice or hemorrhagic MALARIA IMPORTATION AND ELIMINATION IN SWAZILAND
symptoms and mild disease as fever or other reported illness not meeting
Robert C. Reiner1, Justin Cohen2, David Smith3
the severe disease criteria. Using a Bayesian model, we estimated the
probabilities and 95% credible intervals (CI) for asymptomatic infection,
University of California Davis, Davis, CA, United States, 2Clinton Health
mild disease, and severe disease in infected individuals. The average Access Initiative, Boston, MA, United States, 3Johns Hopkins Bloomberg
probability of being asymptomatic was 0.55 (95% CI: 0.37-0.74). The School of Public Health, Baltimore, MD, United States
probability of infection resulting in mild disease was 0.33 (95% CI: Achieving country-wide elimination of malaria requires the cessation
0.13-0.52) and severe disease was 0.12 (95% CI: 0.05-0.26). We also of local transmission caused by imported malaria. Swaziland, a sub-
estimated the case fatality rate for individuals experiencing severe disease; Saharan country that has worked towards malaria elimination for over
the probability of fatality for severe cases was 0.47 (95% CI: 0.31-0.62). a decade, has brought local transmission down to extremely low levels.
For unknown outbreaks, the uncertainty and variability between studies As Swaziland makes further progress towards elimination, the methods
indicates that for every severe case of yellow fever, there may be 1 to 70 and metrics typically used to assess the risk of local transmission initiated
additional infections, representing asymptomatic or mild infections. The from imported malaria become inadequate. Additionally, independent of
large range in all of these estimates reflects the scarcity of data, intrinsic method or metric, accurate accounting of both local and imported cases
variability, and variation between outbreaks, possibly due to study design becomes ever more critical as the relative weight carried by each individual
or differences in environmental, host, vector, or virus characteristics. case increases. To both assess transmission dynamics in a low-transmission
Nonetheless, the results are generally inline with previous estimates, which setting such as Swaziland, as well as evaluate surveillance efforts, we
are derived only from individual studies. As it is generally only the most developed algorithms to estimate malaria transmission chains. Using
severe cases that are recognized and reported, these estimates will help comprehensive case data from 2010 through 2013, these estimated chains
improve the understanding of the burden of disease and the estimation of - based on identifying likely causal links between successive cases through
the potential risk of spread during YF outbreaks. the use of spatio-temporal kernels - provided insight on the frequency
and length of chains of local transmission. By identifying secondary cases
651 that appear to have no likely primary case we catalogue likely gaps in
surveillance. Our analysis suggests than most locally acquired cases were
FLAVIVIRUS EXPOSURE IN NORTHEASTERN KENYA caused by a few imported cases and that most imported cases resulted
in no extended local transmission. Further, we highlight regions in space
A. Desiree LaBeaud1, Tamara Banda1, Julie Brichard1, Samuel where local transmission chains appear to be longest. Our results suggest
Muiruri2, Saidi Dahir2, Crystal Y. Teng1, Ginny Gildengorin1, Eva these regions would benefit from more systematic control and surveillance
Harris3, Eric M. Muchiri4, James Kazura5, Charles H. King5 efforts to identify and curtail extended local transmission in the future.
Children's Hospital Oakland Research Institute, Oakland, CA, United
States, 2Division of Vector Borne and Neglected Tropical Diseases, Nairobi, 653
Kenya, 3Division of Infectious Diseases and Vaccinology, School of Public
Health, University of California Berkeley, CA, United States, 4Division of MAPPING SEASONAL INTERACTIONS BETWEEN POPULATION
Vector-Borne and Neglected Tropical Diseases, Ministry of Health, Nairobi, MOVEMENTS AND MALARIA TRANSMISSION FOR
Kenya, 5Center for Global Health and Diseases, Case Western Reserve STRATEGIC MALARIA ELIMINATION PLANNING
University, Cleveland, OH, United States
Flaviviruses are transmitted throughout the world, though their burden
Christopher Lourenco1, Elisabeth zu Erbach-Schoenberg2, Griffith
is still largely underestimated in Africa. The objective of this study was to
Siloka3, Victor Alegana2, Peter Atkinson2, Bonita Graupe4,
assess the seroprevalence of flavivirus exposure in northeastern Kenya and
Andrew Tatem2
to link previous exposure to risk factors and reported historical symptoms
Clinton Health Access Initiative, Boston, MA, United States, 2University
associated with prior febrile illness. Questionnaires on demographics, of Southampton, Southampton, United Kingdom, 3Namibia National
reported symptoms, and mosquito exposures were administered to 891 Vector-Borne Disease Control Programme, Windhoek, Namibia, 4Mobile
participants among 6 northeastern Kenyan villages in February and March Telecommunications Limited, Windhoek, Namibia
of 2011. Visual acuity tests and physical exams were also performed. In most countries that are planning for malaria elimination a strong
Sera were tested via standardized ELISA protocols for anti-dengue virus seasonality in malaria transmission can be observed. This often drives
IgG. Risk factors associated with seropositivity were determined using the timing of intervention and surveillance efforts, and the seasonal
Fisher's exact test and logistic regression models. Forty-three (4.9%; 95% patterns can potentially be exploited to optimally target resources
for achieving elimination. Factors that have received lesser attention districts in Aceh Province and the monitoring of currently sampled districts
in designing elimination strategies are population movements, their will improve timeliness and reporting completeness of facilities and
seasonal patterns and their demographic composition. As a country or optimize RACD program effectiveness.
area transitions towards malaria elimination, imported cases make up
an increasingly larger proportion of those seen, and the importance 655
of accounting for population movements rises. Throughout the world,
the volumes and major routes of population movements tend to follow SUSTAINABLE MALARIA ELIMINATION ON ANEITYUM
seasonal patterns, with certain times of year showing significantly greater ISLAND, VANUATU, 1991 -2014
amounts of movement than others, and this varying by demographic
groupings. These movements can impact substantially on the dispersal
Akira Kaneko1, Chim Chan1, Rie Isozumi2, Morris Kalkoa3, Luis
of parasites in a region, depending on how the timings and routes of
F. Chaves4, Noriko Watanabe2, Renu Wickremasinghe5, Klara
seasonal movements interact with the seasonality of malaria transmission.
Unosson1, Jackie Cook1, Chris Drakeley6, Masatsugu Kimura2,
Here, we demonstrate how the simple combination of national malaria
Koji Lum7, Marita Troye-Blomberg8, Anders Björkman1, Karl
surveillance system data, case investigation information and population
mobility metrics derived from mobile phone records can inform on these
Karolinska Institutet, Stockholm, Sweden, 2Osaka City University, Osaka,
seasonal interactions, using Namibia as an example. Using anonymized Japan, 3Ministry of Health, Port Vila, Vanuatu, 4Nagasaki University,
cellphone call detail records to determine the mobility patterns of nearly Nagasaki, Japan, 5University of Sri Jayewardenepura, Gangidawila,
2 million residents, we show that the timing, duration of stay and Nugegoda, Sri Lanka, 6London School of Hygiene & Tropical Medicine,
magnitude of movements vary substantially across time and space, with London, United Kingdom, 7Binghamton University, Binghamton, NY,
significant movement peaks in December and January aligning with peak United States, 8Stockholm University, Stockholm, Sweden, 9Australian
malaria transmission. Further, case investigation data from more than 100 Army Malaria Institute, Enoggera, Australia
malaria patients in the region with highest transmission (Zambezi) enables Weekly mass drug administration (MDA) of chloroquine, pyrimethamine/
validation of these mobility patterns and provides valuable additional sulfadoxine, and primaquine was carried out on the entire population of
demographic and epidemiological insights into risk groups and contact 718 inhabitants of Aneityum island for 9 weeks in 1991 before the onset
patterns. The approaches presented can be updated rapidly and used to of the rainy season. Simultaneously insecticide-treated bednets (ITNs) were
identify which regions would benefit from coordinating efforts at certain distributed to the entire population. Microscopy showed the immediate
times of year and how spatially progressive elimination plans can be disappearance of Plasmodium falciparum, whereas P. vivax disappeared
designed to account for the interacting seasonality in transmission and from 1996 onwards until new cases were reported in January 2002. In
mobility. July 2002 P. vivax infections were detected by microscopy in 22 of 759
individuals: 20/298 born after 1991, 2/126 born between 1991-82, and
654 0/335 born before 1982. Subsequent PCR increased the total to 77 (36,
21, and 20 in respective age groups). The age distribution was similar to
A MONITORING AND EVALUATION TOOL FOR REACTIVE those before elimination and on other islands. In November a similar age
CASE DETECTION: PILOT EXPERIENCE IN ACEH PROVINCE, pattern was found but with fewer (39) infections. In December 2002, the
INDONESIA 2nd MDA of weekly chloroquine for four weeks and daily primaquine
for 14 days was carried out as a containment measure on the population
Herdiana Hasan1, Kelly Sanders2, Chris Cotter2, Roly D. Gosling2 born after 1982, in concert with re-strengthening of the community-
UNICEF, Banda Aceh Field Office, Aceh Province, Indonesia, 2Global based provision of ITNs. Population-wide mass blood surveys detected
Health Group at the University of California San Francisco, San Francisco, by PCR no cases in December 2002 (n=436, only those born after 1982),
CA, United States immediately after the MDA, but 26 in 2003 (730), 20 in 2004 (732), 34
Active case detection (ACD) strategies are recommended by the World in 2005 (836), and 15 in 2007 (719). No positive cases were detected in
Health Organization and are implemented in many low transmission 2010 (950) and 2013 (1093). The age distribution of 2003-2007 positive
settings worldwide as a critical part of malaria elimination programs. ACD cases was different from those before elimination and on other islands: i.e.
strategies include determining the origin of infection, case investigation, a substantially lower prevalence was observed in the population born after
and responding to locally acquired cases of malaria, known as reactive 2002 (0.8%) than those between 2002-1992 (3.7%), between 1991-1982
case detection (RACD). Effectively implementing RACD requires substantial (5.3%), and before 1982 (2.1%), suggesting that these submicroscopic
programmatic and human resources. Aceh Province has a goal to infections mainly reflected relapses from liver stages. Sero-epidemiological
eliminate malaria by 2015. Between June and September 2013, a pilot monitoring suggested that the persistence of antibodies against P. vivax
was conducted to evaluate RACD activities and identify best practices to may partially explain the lower parasite prevalence in the oldest age
inform RACD efforts in Aceh Province. Using a standardized monitoring group. On Aneityum, indigenous P. falciparum transmission has never re-
and evaluation (M&E) tool, a sample of 5 districts including 34 health established after the 1st MDA in 1991, despite surveillance by community
facilities were evaluated to measure RACD indicators, in addition to staff microscopists that showed continuous parasite importation from other
interviews regarding RACD procedures. To measure case investigation islands. A high degree of community engagement to prevent resurgence,
and RACD rates and timeliness, quantitative data was extracted from the in addition to high ITN coverage (1.05 net/person) and usage (95%, 2014),
district health offices and health facility registers and measured against sustains malaria freedom on this island.
defined indicators. Questionnaires were administered to 59 health facility
staff involved in conducting RACD. From January to December 2012, a 656
total of 289 cases (range 0 to 153) were reported at health facilities with
a completeness of 92% when compared with the district health office GENETIC CORRELATES OF DECLINING TRANSMISSION:
records. Mean case investigation rates were 78% (range from 62 to 100). PLASMODIUM VIVAX IN SRI LANKA
Screening by microscopy was conducted on a total of 931 community
Sharmini Gunawardena1, Marcelo U. Ferreira2, G. M.
individuals (16.3 individuals per index case) with 3 new infections
Kapilananda1, Dyann F. Wirth3, Nadira D. Karunaweera1
identified. Mean timeliness of RACD conducted within 7 days was 82%
(range from 43 to 100). These findings indicate the need for improved
University of Colombo, Colombo, Sri Lanka, 2University of São Paulo, São
patient data collection upon presentation at the health facility, and for Paulo, Brazil, 3Harvard School of Public Health, Boston, MA, United States
staff to visit index cases after normal work hours to prevent loss due to We examined whether the recent dramatic decline in malaria transmission
follow up during case investigations. Rollout of the M&E tool to additional in Sri Lanka led to a major bottleneck in the local P. vivax population, with
a substantial decrease in the effective population size. To this end, we
typed 14 highly polymorphic microsatellite markers in 185 P. vivax patient to control not only the indoor transmission during sleeping time (ITN) but
isolates collected from 13 districts in Sri Lanka over a period of five years also the increasing proportion of residual transmission which occurs mainly
(2003-2007). Overall, we found a high degree of polymorphism, with 184 outdoors, and before and after sleeping time.
unique haplotypes (12-46 alleles per locus) and average genetic diversity
(expected heterozygosity) of 0.8744. A marginal decline in Allelic diversity 658
(15.4 to 10.9) as well as heterozygosity (0.87 to 0.82) was observed from
the 2003-4 to 2006-7 period. Almost 69% (n=127) isolates had multiple- A CLUSTER-RANDOMIZED TRIAL OF TARGETED CONTROL TO
clone infections with no major changes observed over time. Significant ELIMINATE MALARIA IN CENTRAL SENEGAL: STUDY DESIGN
spatial and temporal differentiation (FST=0.04 - 0.25; p≤0.0009) between AND ACCEPTABILITY OF THE INTERVENTIONS
populations was observed. The effective population size was relatively
high but showed a decline from 2003-4 to 2006-7 periods (estimated as Abdoulaye Diallo1, Badara Cissé1, Fassiatou Tairou1, El hadji Bâ2,
45,661 to 22,896 or 10,513 to 7,057, depending on the underlying model Ousmane Sy3, Jules Gomis1, Cheikh Sokhna2, Jean Gaudart4, Clare
used). We used three approaches - namely, mode-shift in allele frequency Flach5, Oumar Gaye1, Ousmane Faye3, Paul Milligan5
distribution, detection of heterozygote excess and the M-ratio statistics
Laboratoire parasitologie, University Cheikh Anta Diop, Dakar, Senegal,
- to test for evidence of a recent population bottleneck but only the low
Institut de Recherche pour le Developpement, Dakar, Senegal, 3Faculté
values of M-ratio statistics (ranging between 0.15-0.33, mean 0.26) were des sciences, University Cheikh Anta Diop, Dakar, Senegal, 4Aix-Marseille
suggestive of such a bottleneck. The persistence of high genetic diversity Université, Marseille, France, 5London School of Hygiene & Tropical
and high proportion of multiple-clone infections, with little change in Medecine, London, United Kingdom
effective population size, despite the collapse in demographic population The purpose of this trial is to evaluate the extent to which a targetted
size of P. vivax in Sri Lanka indicates the importance of maintaining malaria control strategy combining vector control with indoor residual
stringent control and surveillance measures to prevent resurgence. It also spraying (IRS) and chemotherapy, delivered by district health staff to
appears that more samples (over decades) might be required to detect the villages reporting clinical cases, can reduce the transmission of malaria,
genetic signatures of shrinking malaria transmission. in a region where scaling up of control measures has been effective in
reducing the incidence of malaria. The trial will also determine whether,
657 as part of this strategy, chemotherapy should be delivered to all members
of targetted communities (MDA, Mass Drug Administration) or only
EVALUATION OF TOPICAL REPELLENTS AS ADDITIONAL those who have been tested and are known to be infected (MSAT,
VECTOR CONTROL MEASURES TO CONTROL RESIDUAL Mass Screening and Treatment). Methods: 45 health posts, each serves
TRANSMISSION IN MALARIA PRE-ELIMINATION AREAS about 10,000 people, were randomized in 40 clusters; 15 to receive IRS
and MSAT, 15 to receive IRS and MDA, and 10 to serve as controls. In
Marc Coosemans1, Vincent Sluydts1, Sochantha Tho2, intervention clusters, villages with evidence of transmission (hotspots) were
Sovannaroth Siv2, Heng Somony2, Lydie Canier3, Khim Nimol3, identified on the basis of confirmed malaria cases reported the previous
Kim Soarin3, Sokny Mao2, Charlotte Gryseels1, Uk Sambunny2, year. Interventions are delivered over two years, the primary outcomes
Karel Van Roey1, Karen Kerkhof1, Koen Peeters Grietens1, Didier are the incidence of malaria and the prevalence of parasitaemia just after
Menard3, Lies Durnez1 the main peak period of transmission in the second year. To assess effects
Institute of Tropical Medicine Antwerp, Antwerp, Belgium, 2National on transmission, incidence in non-targetted areas in each cluster will be
Center for Parasitology, Entomology and Malaria Control, Phnom Penh, compared. In 30 clusters, all households in hotspot villages were targetted
Cambodia, 3Institut Pasteur du Cambodge, Phnom Penh, Cambodia to receive IRS with Actellic 300CS in July, followed in 15 of the clusters
In Southeast Asia a substantial decrease of malaria has been achieved by MDA with dihydroartemisinin-piperaquine (DHA-PQ) administered to
during the last decade and elimination is now becoming a realistic goal. all persons in the household in September and again in October, and in
However residual transmission due to outdoor and/ or early biting vectors the other 15 clusters, instead of MDA, all persons in the household were
is not tackled by wide coverage of insecticide treated nets (ITNs). This screened using a malaria RDT and those who test positive treated with
may compromise the elimination efforts. For this purpose we set up a DHA-PQ. In all trial clusters, LLIN coverage was topped-up by providing
study to evaluate the public health value of mass use of topical repellent persons diagnosed with malaria with a LLIN. Results and conclusion:
in addition to ITNs. A randomized community based design has been Preliminary results after the first year of intervention will be presented,
adopted covering a population of 40,000 inhabitants in the province of including description of the logistics of MDA and MSAT delivery, the
Ratanakiri in Cambodia. The 98 clusters were randomly divided in two coverage of the interventions, the sensitivity of RDTs for detecting
arms after a pre-trial survey: one intervention arm (ITN and repellent) infections, and the acceptability of both interventions by the community.
and one control arm (only ITNs). Comparing to a randomized household
trial, present design has the advantage to avoid the risk of the repellent 659
aversion effect and the exchange of products between the households.
The principal indicators of effectiveness is the prevalence of parasite ZOONOTIC RISKS OF NON-TUBERCULOUS MYCOBACTERIA
carriers measured by PCR techniques using a mobile molecular lab in BETWEEN HUMANS AND SMALL MAMMALS (POTENTIAL
the field, and the measurement of malaria antibodies. While parasite- TRANSMISSION OF BURULI ULCER) IN COTE D'IVOIRE AND
prevalence provides a snapshot of the exposure to malaria at a certain GHANA
moment, serological indicators provide a picture of the "force of malaria
infection" over a prolonged period. Moreover passive case detection Lydia Mosi1, Charles Quaye2, Charles A. Narh2, Christelle Dassi1,
provides a measurement of malaria disease incidence in both arms. Danielle Konan1, Gilbert Fokou1, Bertin Akpatou1, Bassirou
We expect a community protection against residual transmission when Bonfoh1
a high adherence in the use of repellents is achieved. To address this Centre Suisse de Recherche Scientifique, Abidjan, Côte D'Ivoire, 2Noguchi
working hypothesis of mass effect of repellents on the vector population Memorial Institute for Medical Research, Legon, Ghana
entomological surveys are carried out in both arms. The effectiveness of The prevalence of Buruli ulcer, caused by the non-tuberculous
the intervention is dependent on the efficacy of the repellents against Mycobacterium ulcerans (MU), ranges from 1-150/100,000 infected
vector bites and the effective use of repellents by the population and individuals in Ghana and Côte d'Ivoire, making it the second most
both are addressed in the study design. First results will be presented. The important mycobacterial disease. The mode of transmission is unknown
outcome of this study will be crucial in the development of new strategies and compounding this is the fact that mycolactone, the major virulence
factor, has been found in other environmental mycobacteria species
(MPMs) which cause disease in some animals. Although there are no
reports of human disease caused by these novel species, they share 661
similar ecological niches in the endemic aquatic environments. Our
work is based on the One Health concept and suggests that overlapping Q FEVER OUTBREAK ON A LARGE U.S. GOAT AND CATTLE
environmental habitats of the pathogen, animals and humans directly DAIRY: A ONE HEALTH INVESTIGATION
influence transmission. Using (i) active case surveillance of human disease
burden; (ii) molecular characterization of NTMs; (iii) and zoonotic risk Holly M. Biggs1, George Turabelidze2, Suzanne R. Todd1, Kara
analysis, we are conducting a study in 6 communities of Côte d'Ivoire and Jacobs Slifka1, Naomi A. Drexler1, Drew Pratt2, Gail McCurdy2,
4 communities in Ghana to understand transmission. Comparative analysis Jennifer K. Lloyd2, Cecelia Y. Kato1, David Sun1, Minh L. Tang1,
of our socio- anthropological data suggests that individuals in Ghana Joseph Singleton1, Gilbert J. Kersh1, Alicia D. Anderson1
have a higher level of Buruli ulcer awareness than in Côte d'Ivoire. In both Centers for Disease Control and Prevention, Atlanta, GA, United States,
countries, association with dirty water is a risk factor and affected people Missouri Department of Health and Senior Services, Jefferson City, MO,
are generally poor. Molecular analysis of our environmental samples United States
indicate a high presence of mycobacterial DNA including MPMs. Almost Q fever, caused by Coxiella burnetii, is an under-recognized and under-
all of our suspected human cases also type positive for MU DNA. Using reported zoonotic disease transmitted to humans primarily via infected
Variable Nucleotide Tandem Repeat (VNTR) typing, we have been able to livestock. Between June-November, 2013, 12 cases of Q fever linked
profile and identify one common genotype that is present in both humans to a Missouri community that operates a large goat and cattle dairy,
and the environment within the same community in both countries. Community A, were reported to the state health department. This
Interestingly we have identified mycobacterial DNA with MPM profiles in compared to an average of 3 (range 1-5) cases reported annually in
lesions and swellings from trapped small mammals within our study sites. Missouri over the past 5 years. In December, 2013, we performed
Most of the animals were rats, with the majority from homes close to a coordinated human, animal and environmental investigation in
water bodies in both countries. We intend to develop a model of infection Community A to determine the extent and epidemiology of C. burnetii
dynamics, and identify key risk factors that will ultimately improve control infection. Community members were offered C. burnetii serologic testing
and surveillance strategies for National Control Program. and a standardized interview. A case was defined as a C. burnetii phase II
IgG titer ≥1:128 in a person linked to Community A since June 1, 2013.
660 Representative milk samples from the goat and cattle herds, vaginal swabs
from peri-parturient animals, and environmental samples were tested by C.
LINKED HUMAN AND LIVESTOCK STUDY ON burnetii PCR. Of 135 persons interviewed and tested, 47 (35%) human Q
SEROPREVALENCE AND RISK FACTORS FOR BRUCELLOSIS IN fever cases were identified. Both cattle and goat samples were C. burnetii
KENYA, 2012 PCR positive, although goat samples were more frequently positive (17%
vs. 2% of milk samples, and 26% vs. 7% vaginal swabs, respectively). Of
Eric M. Osoro1, Austine O. Bitek2, Eric Ogola3, Ian Njeru1, Salome
environmental samples, C. burnetii was detected at highest levels in the
Wanyoike2, Murithi R. Mbabu2
goat birthing areas. The risk of Q fever was 2.7 times greater (95% CI:
Ministry of Health, Nairobi, Kenya, 2Ministry of Agriculture, Livestock 1.3-5.3) for persons with livestock or manure contact compared to those
and Fisheries, Nairobi, Kenya, 3Kenya Medical Research Institute, Nairobi, without. Among persons without livestock exposure, having a household
Kenya member with regular livestock contact was associated with 4.8 times
Brucellosis is an endemic zoonotic disease in Kenya with dual burden greater Q fever risk (95% CI: 1.1-20.7). This is the largest human Q fever
with significant economic losses among livestock and illness and disability outbreak reported to date in the U.S. Contact with or proximity to goats
in humans. Brucellosis studies in Kenya have previously focused on and cattle was a significant risk factor for infection, and the possibility of
either animals or humans. We conducted a cross-sectional survey that fomite transmission to household members warrants further evaluation.
examined humans and livestock (cattle, sheep, bovine, camels) in the A One Health approach incorporating education and modifications to
same households. We assessed the seroprevalence and risk factors for husbandry practices was recommended to reduce potential morbidity and
human brucellosis, animal brucellosis and their association. The study was mortality and prevent future C. burnetii transmission.
conducted in three counties with different livestock production systems;
Random households were selected with a two-stage cluster sampling 662
method by sub-location and then household. Three persons were enrolled
and livestock species proportional to the size of the herd were sampled RISK FACTORS ASSOCIATED WITH HUMAN MONKEYPOX IN
per household. A questionnaire was administered to household heads and THE DEMOCRATIC REPUBLIC OF CONGO
the persons sampled. Human sera were tested for Brucella IgG antibodies
using competitive ELISA and animal sera were tested using an indirect Nicole Hoff1, Prime M. Mulembakani2, Sara C. Johnston3, Neville
ELISA. Risk factors were assessed using multivariate logistic regression. K. Kisalu4, Jean-Jacques Muyembe5, Lisa E. Hensley6, Emile
A total of 1,099 households, 2,811 persons and 11,039 livestock were Okitolonda7, Anne W. Rimoin1
enrolled. Overall, 14% (95%CI 12-16) of households had at least one
University of California Los Angeles, Fielding School of Public Health, Los
Brucella seropositive person and 15% (95%CI 12-18) of herds had at Angeles, CA, United States, 2Kinshasa School of Public Health, Kinshasa,
least one seropositive animal. Among humans sampled, 6.7% (95%CI Democratic Republic of the Congo, 3United States Army Medical Research
5.6 -7.8) were seropositive. Risk factors for human seropositivity included Institute of Infectious Diseases, Frederick, MD, United States, 4Vaccine
taking unboiled milk (aOR=3.9, 95%CI 2.0-7.6), exposure to goats Research Center, National Institute of Allergy and Infectious Diseases/
[herding, milking, feeding] (aOR=2.5, 95% CI 1.6-4.0) and handling National Institutes of Health, Bethesda, MD, United States, 5National
hides (aOR=3.9, 95%CI 2.5-6.2). Animal seropositivity was associated Institute of Biomedical Research, Kinshasa, Democratic Republic of the
with intermingling with wildlife (aOR=4.3, 95%CI 2.3-8.1) and keeping Congo, 6National Institutes of Health/National Institute of Allergy and
goats (aOR=2.7, 95%CI 1.4-5.2). The odds of human seropositivity given Infectious Diseases/IRF, Bethesda, MD, United States, 7Ministry of Health,
a seropositive animal in the same household was 5.3 (95% CI 3.2 -8.8). Kinshasa, Democratic Republic of the Congo
This linked survey shows that human and animal brucellosis seropositivity Monkeypox (MPX), a zoonotic orthopoxvirus causes a serious, smallpox-
is associated with factors that increase exposure to seropositive animals. like illness in humans. Much remains unknown about the risk factors
The survey contributes to understanding the burden of brucellosis in Kenya associated with this disease; to-date, no large-scale case-control studies
and targeting of health education programs. have been conducted. Between 2007 and 2009, two studies were
conducted concurrently in the Sankuru District of the Democratic Republic
of the Congo (DRC). The first study aimed to collect data through a
population-based active disease surveillance program to improve disease
surveillance activities under the Ministry of Health and gain insight into (using Shannon-Wiener and Simpson's indices). The overall human SA
transmission dynamics associated with MPX disease. The second study, a EEEV seroprevalence was 4.8%, with no age trend, suggesting that SA
population-based serological survey, collected health behavior information EEEV exposure may be recent, consistent with a lack of seroprevalence
from healthy participants in the same geographic region. Both studies in past Panamanian surveys. The sites with highest abundance of EEE
collected information on demographic, health, and animal exposure positive animals did not coincide, however, with highest seroprevalence in
data as well as tissue samples from all active cases and blood samples humans. Since human VEE seropositivity in these sites was as high as 78%,
from healthy participants. We subsequently preformed a matched case- we hypothesize that this geographical discrepancy may be due to cross-
control analysis using these two similarly collected datasets to identify protective immunity. Future studies to further clarify the impact of land use
potential risk factors for human MPX in the DRC. Samples were collected change on EEEV transmission are necessary to guide public health policy in
from 595 suspected MPX patients identified through active surveillance Central and South American countries.
and from 2,345 healthy persons enrolled in the population-based study.
Suspected cases of human MPX were investigated based on the presence 664
of monkeypox-like lesions and confirmed with real time Polymerase Chain
Reaction (PCR) using vesicle fluid or scabs; controls were chosen based on CANINE RABIES VACCINATION TO PREVENT HUMAN RABIES
the absence of both skin lesions and specific MPX antibodies in serum by IN RURAL TANZANIA
laboratory diagnosis. 390 MPX-positive cases were included in the analysis,
stratified by the presumed source of infection (animal (n=252) or human
Meagan C. Fitzpatrick1, Katie Hampson2, Sarah Cleaveland2,
(n=138) source), and were matched to a total of 653 MPX-negative
Imam Mzimbiri3, Felix Lankester4, Tiziana Lembo2, Lauren A.
controls based on sex and age categories. Initial findings from univariate
Meyers5, A. David Paltiel1, Alison P. Galvani1
and multivariate analysis suggest individuals with evidence of smallpox
Yale School of Public Health, New Haven, CT, United States, 2Boyd Orr
vaccination are at a reduced risk for MPX infection (adjusted OR (aOR): Center for Population and Ecosystem Health, Institute of Biodiversity,
0.12, 95% C.I: 0.03, 0.56) while exposures to animals including Gambian Animal Health and Comparative Medicine, College of Medical, Veterinary
rats (aOR: 2.58, 95% C.I: 1.63, 4.07), large terrestrial rodents (aOR: 1.80, and Life Sciences, University of Glasgow, Glasgow, United Kingdom,
95% C.I: 1.08, 2.98), prosimiens (aOR: 1.85, 95% C.I: 1.24, 2.75), and
Serengeti Health Initiative, Lincoln Park Zoo, Chicago, IL, United States,
non-human primates (aOR: 2.66, 95% C.I: 1.44, 4.90), may be associated
Paul G. Allen School for Global Animal Health, Washington State
with an increased risk of MPX infection, particularly in unvaccinated University, Pullman, WA, United States, 5Section of Integrative Biology,
populations. Austin, TX, United States
The annual mortality rate of human rabies in rural Africa is 3.6 deaths
663 per 100,000 individuals. Rabies can be prevented by prompt post-
exposure prophylaxis, but this is costly and often inaccessible in rural
SOUTH AMERICAN EASTERN EQUINE ENCEPHALITIS: Africa. As 99% of human exposures occur through rabid dogs, canine
POSSIBLE ENZOOTIC HOSTS, HUMAN EPIDEMIOLOGY AND vaccination also prevents transmission of rabies to humans. We evaluate
ASSOCIATIONS WITH LAND USE the cost-effectiveness of rabies control through annual canine vaccination
campaigns in two districts of rural Tanzania, Ngorongoro and Serengeti,
Amy Y. Vittor1, Blas Armien2, Publio Gonzalez2, Daniel Gonzalez2, using a dynamic model of transmission in both dogs and wildlife and
Claudia Dominguez2, Mario Avila3, Jean Paul Carrera2, Julio incorporating empirical uncertainty in the biological parameters to make
Cisneros2, Davis Beltran2, Eryu Wang1, Anayansi Valderrama2, probability-based evaluations of cost-effectiveness. We find that annual
Doug Goodin4, Jason Blackburn1, Alex Castillo2, Brechla Moreno2, canine vaccination campaigns are very cost-effective in both districts
Nestor Sosa2, Juan Miguel Pascale2, Scott Weaver5 compared with no canine vaccination. In Serengeti, annual campaigns
University of Florida, Gainesville, FL, United States, 2Instituto up to 70% coverage are cost-saving. Across a wide-range of parameter
Comemorativo Gorgas, Panama, Panama, 3Departamento de Control assumptions and levels of societal willingness-to-pay for life-years,
de Vectores, Panama, Panama, 4Kansas State University, Manhattan, KS, vaccination campaigns are always cost-effective and life-saving, and
United States, 5University of Texas Medical Branch, Galveston, TX, United therefore preferred.
South American eastern equine encephalitis virus (SA EEEV, recently 665
reclassified into the species Madariaga virus) had not been associated with
significant human disease, unlike its North American counterpart, until CROSS-SPECIES TRANSMISSION OF TAXONOMICALLY
a 2010 Panama outbreak. SA EEEV is an alphavirus (family Togaviridae) DIVERSE PATHOGENS IN A COMMUNITY OF WILD PRIMATES
transmitted by Culex mosquitoes (subgenus Melanoconion). Since
Tony L. Goldberg1, Colin A. Chapman2, David H. O'Connor1,
transmission and epidemiology of SA EEEV is not well understood, we
Thomas C. Friedrich1, Michael Lauck1, Samuel D. Sibley1, Adam
conducted a serosurvey of small mammals and birds, coupled with a
L. Bailey1, David Hyeroba3, Alex Tumukunde3, Geoffrey Weny3,
human serosurvey. We hypothesized that SA EEEV seroprevalence would
Nelson Ting4, Jens Kuhn5, Ria R. Ghai2, Noah D. Simons4, Jorge
be higher in agricultural areas compared to forested areas, mediated by
Dinis1, Mary I. Thurber1
habitat preferences of generalist species likely to serve as enzootic hosts.
From January to December 2012, rodents and marsupials were trapped in
University of Wisconsin Madison, Madison, WI, United States, 2McGill
42 locations (village, cultivated fields, pasture, shrub, forest; 12,005 trap University, Montreal, QC, Canada, 3Makerere University, Kampala, Uganda,
nights, n=556 rodents; n=20 marsupials). Mist nets were also placed at
University of Oregon, Eugene, OR, United States, 5Integrated Research
night for bat trapping (n=32), and bird samples obtained during a prior Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases,
field effort were tested (n=162). During this period, 776 people from National Institutes of Health, Frederick, MD, United States
3 population centers were surveyed. Sera were tested for SA EEEV and Viruses are considered likely to "jump" species barriers due to their high
the closely related and endemic Venezuelan equine encephalitis virus genetic variability and adaptive potential, whereas more genomically
(VEEV), by IgG ELISA and plaque reduction neutralization tests (PRNT), complex pathogens are considered less likely to cross species barriers.
and mammal spleens were tested for virus by RT-PCR. We found that the We evaluated this hypothesis by examining a taxonomically diverse set
short-tailed cane mouse (Zygodontomys brevicauda), a generalist species, of pathogens in a community of wild primates in Uganda. Metagenomic
had the highest overall EEEV seroprevalence (8.3%), and was the most analyses of blood plasma identified approximately 12 novel RNA viruses of
numerous rodent species trapped (n=229). The abundance of this species the families Retroviridae, Arteriviridae, and Flaviviridae. These viruses were
was highly associated with cultivated fields and pasture. The abundance highly diverse within primate species (up to approximately 13% sequence
of EEEV-positive animals was greater for sites with high rodent diversity divergence) and displayed high levels of intra-host genetic variation (up
to approximately 2% nucleotide diversity), but all were restricted to hosts and WHO HIV Clinical Staging) was seen between study arms. In the RTS,S
of a single species. Apicomplexan parasites of the genus Hepatocystis, arm, anti-CS antibody geometric mean titer (EU/mL) was 0.3 (95%CI:0.3-
related to Plasmodium, were detected using microscopy and PCR. "Deep 0.4), 329.2 (95%CI:260.6-415.8) and 18.4 (95%CI:13.3-25.5) at baseline,
sequencing" of the parasite cytochrome b gene showed one Hepatocystis one and 12 months post-dose 3. Vaccine efficacy against first episode of
lineage to be transmitted frequently between red colobus monkeys clinical malaria was 31% (95%CI:-19-60). RTS,S/AS01 showed no serious
(Procolobus rufomitratus) and olive baboons (Papio anubis), whereas the safety concerns and was immunogenic in HIV-infected children. When
remaining five lineages infected hosts of a single species. Analyses of fecal considered with efficacy data, HIV-infected children need not be excluded
samples revealed helminth parasites of the genera Oesophogostomum from potential future vaccination programs with RTS,S/AS01.
(nodule worms) and Trichuris (whipworms), which were further
characterized by PCR and sequencing of the internal transcribed spacer 667
region of the ribosomal DNA complex. Both parasite genera contained
multiple cryptic lineages, some representing putative novel taxa, and MATHEMATICAL MODELING OF THE SITE-SPECIFIC IMPACT
several infecting primates of multiple species, including humans. OF THE RTS,S VACCINE UNDER MULTIPLE ROLL-OUT
Collectively, these results suggest that pathogens with highly variable and SCENARIOS
mutable genomes (e.g. RNA viruses) are not necessarily more likely to cross
species barriers than more genomically complex pathogens (e.g. protozoa Caitlin A. Bever, Edward Wenger, Kevin A. McCarthy, Philip
and helminths), in certain ecological settings. Efforts to prevent zoonotic Eckhoff
transmission in such settings should focus on common transmission Institute for Disease Modeling, Intellectual Ventures, Bellevue, WA, United
pathways inferred from empirical studies of a range of pathogen taxa, States
rather than on specific classes of pathogens assumed to have high cross- Vaccines against malaria are one promising avenue for reducing the
species transmission potential. global burden of the disease beyond what has been achieved with current
interventions. The pre-erythrocytic vaccine RTS,S is the candidate furthest
666 along the development pipeline, and as such there is great interest in the
potential impact of a large-scale roll-out. Here, we addressed this question
SAFETY AND IMMUNOGENICITY OF RTS,S/AS01 MALARIA by using the previously developed EMOD model of malaria to simulate
VACCINE CANDIDATE IN HIV INFECTED INFANTS AND the outcome of such a campaign. The central model is a mathematical
CHILDREN: A PHASE III RANDOMIZED, DOUBLE-BLIND, description of the vector life cycle coupled to within-host parasite and
CONTROLLED TRIAL immune dynamics. To study RTS,S, we incorporated a representation of the
vaccine, characterized by an initial efficacy against infection and a half-life
Lucas O. Tina1, Martina Oneko2, Walter Otieno1, Abuodha of protection. An iterative stochastic approach was used to optimize the
Odunga2, Emmanuel Owino1, Chris Odero2, Yolanda Guerra modeled vaccine properties by sampling parameter space and evaluating
Mendoza3, Ben Andagalu1, Norbert Awino2, Karen Ivinson4, Dirk a likelihood function that assesses the fit between the simulations and
Heerwegh3, Nekoye Otsyula1, Maria Oziemkowska2, Effua-Abigail clinical trial data. Having obtained a calibrated model of RTS,S, we
Usuf3, Allan Otieno1, Kephas Otieno2, Didier Leboulleux4, Amanda subsequently explored a variety of different roll-out scenarios to test the
Leach3, Janet Oyieko1, Laurence Slutsker2, Marc Lievens3, Jessica effects of policy choices (e.g., age of first administration, booster inclusion)
Cowden1, Didier Lapierre3, Simon Kariuki2, Bernhards Ogutu1, and deployment setting characteristics (e.g., demographics, seasonality).
Johan Vekemans3, Mary J. Hamel2 Additionally, sensitivity analyses were performed on other axes, such as
KEMRI-Walter Reed Project, Kisumu, Kenya, 2KEMRI/Centers for Disease coverage level and treatment-seeking behavior, quantities that are at once
Control and Prevention, Kisumu, Kenya, 3GlaxoSmithKline Vaccines, difficult to measure and highly relevant to the success of a campaign.
Wavre, Belgium, 4PATH Malaria Vaccine Initiative, Washington, DC, United Simulated clinical and severe incidences were incorporated into a cost
States analysis in order to establish the incremental impact of the vaccine over
Malaria and HIV remain important global health problems. The RTS,S/ other interventions, such as insecticide-treated nets (ITNs). We concluded
AS01 malaria vaccine candidate, which showed protection against that the cost effectiveness of population-wide infant vaccination is
malaria with a favorable safety and immunogenicity profile during trials greatest in regions of moderate endemicity, though the specifics depend
in sub-Saharan Africa, had previously not been evaluated specifically on a number of factors, including pre-existing ITN coverage and local
in HIV-infected participants. We measured safety and immunogenicity anopheline feeding preferences.
in children with WHO stage 1 or 2 HIV disease at two centers in Kenya
(NCT01148459). Children aged 6 weeks to 17 months were randomized
1:1 to receive 3 doses of RTS,S/AS01 or rabies vaccine, administered
monthly. The primary objective was occurrence of serious adverse events
(SAEs) from first vaccination until 14 months post-dose 1. A secondary
objective, incident clinical malaria, was captured by passive case detection.
Baseline characteristics were similar between study arms. Out of 200
children enrolled, 177 (89%) completed follow-up. The frequency of
SAEs was 41.4% (95%CI:31.6-51.8) among RTS,S/AS01 recipients and
36.6% (95%CI:27.3-46.8) among rabies vaccine recipients. At least one
SAE was reported within 30 days of vaccination in 20.2% (95%CI:12.8-
29.5) of RTS,S/AS01 recipients and 11.9% (95%CI:6.3-19.8) of rabies
vaccine recipients. At least one episode of pneumonia occurred in 13/99
(13.1%) RTS,S/AS01 recipients compared to 5/101 (5.0%) rabies vaccine
recipients within 30 days post-vaccination. Fatal SAEs occurred in 5.1%
(95%CI:1.7-11.4) of RTS,S/AS01 recipients and 4.0% (95%CI:1.1-9.8)
of rabies vaccine recipients. One related SAE was reported: a febrile
convulsion in an RTS,S/AS01 recipient. Solicited adverse event frequency
7 days post-vaccination was: injection site pain 18.1% and 6%, fever
41.7% and 18.8%, irritability 25.3% and 10.7%, and loss of appetite
17.7% and 8.7% in the RTS,S/AS01 and rabies vaccine group respectively.
No evidence of differential HIV disease progression (CD4+, HIV viral load
668 669
Sara A. Healy1, Issaka Sagara2, Kawsar Talaat3, Mahamadoun
H. Assadou2, Merepen A. Guindo1, Joan Aebig1, Sarah Brockley1, ADULTS
Charles Anderson1, Kelly Rausch1, David L. Narum1, David S. Sara A. Healy1, Mahamadou S. Sissoko2, Freda Omaswa3,
Jones1, Nicholas MacDonald1, Daming Zhu1, Olga Muratova1, Abdoulaye Katile2, Bourama Kamate2, Yacouba Samake2,
Erin Gabriel4, Michael Fay4, Amagana Dolo2, Yimin Wu1, Ogobara Amagana Dolo2, Karamoko Niare2, Amadou Niangaly2, Merepen
Doumbo2, Patrick Duffy1 A. Guindo2, Erin Gabriel4, Michael Fay4, Eric James3, Anita
Laboratory of Malaria Immunology and Vaccinology, National Institute Manoj3, Anusha Gunasekera3, B. Kim Lee Sim3, Peter Billingsley3,
of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Irfan Zaidi1, Stephen L. Hoffman3, Ogobara Doumbo2, Michael
MD, United States, 2Malaria Research and Training Center, Mali-NIAID Walther1, Patrick Duffy1
ICER, University of Science, Techniques and Technologies of Bamako, 1
Laboratory of Malaria Immunology and Vaccinology, National Institute
Bamako, Mali, 3Center for Immunization Research, Johns Hopkins of Allergy and Infectious Diseases, National Institutes of Health, Rockville,
Bloomberg School of Public Health, Baltimore, MD, United States, MD, United States, 2Malaria Research and Training Center, Mali-NIAID
Biostatistical Research Branch, National Institute of Allergy and Infectious ICER, University of Science, Techniques and Technologies of Bamako,
Diseases, National Institutes of Health, Rockville, MD, United States Bamako, Mali, 3Sanaria, Inc., Rockville, MD, United States, 4Biostatistical
A vaccine to interrupt malaria transmission would be a valuable tool for Research Branch, National Institute of Allergy and Infectious Diseases,
local elimination or eradication of malaria. Phase 1 clinical trials to assess Rockville, MD, United States
the safety and immunogenicity of the Plasmodium falciparum transmission For decades it has been known that humans can be protected against
blocking vaccine candidate Pfs25-EPA/Alhydrogel® have been conducted malaria by repeated immunization with radiation-attenuated Plasmodium
in malaria naïve adults in the US and in malaria-exposed adults in Mali. falciparum (Pf) sporozoites (SPZ). Traditionally, those PfSPZ have been
The US Phase 1 study was an open label dose escalating study in which administered by exposing vaccinees to the bites of >1,000 PfSPZ-infected,
five volunteers (safety dose of 8 µg Pfs25-EPA/Alhydrogel®) received 2 irradiated mosquitoes. Recently, a process for manufacturing aseptic,
doses, five volunteers (low dose of 16 µg Pfs25-EPA/Alhydrogel®) received purified, radiation attenuated cryopreserved PfSPZ has been developed.
2 doses (Days 0, 56) and 20 volunteers (high dose of 47 µg Pfs25-EPA/ When administered by IV injection, this product, Sanaria® PfSPZ Vaccine,
Alhydrogel®) received 4 doses (Days 0, 56, 120, 300). The Mali Phase 1 induced sterile protection against controlled human malaria infection in
study enrolled 120 volunteers in the double blind randomized control 6/6 malaria naïve adults who received the highest dosage. To begin the
study: 20 volunteers (low dose of 16µg Pfs25-EPA/Alhydrogel® or process of assessing the vaccine in Africa, we are conducting a double
control) received 2 doses (Days 0, 56) and 100 volunteers (high dose of blind, randomized, controlled Phase 1 clinical trial to assess PfSPZ Vaccine's
47µg Pfs25-EPA/Alhydrogel® or control) have thus far received 3 doses safety, immunogenicity, and protective efficacy against naturally occurring
(Days 0, 56, 112) with a scheduled fourth vaccination on Day 480. malaria infection in healthy, malaria exposed, 18-35 years old Malians.
Vaccinations were well tolerated in both populations. Specific anti-Pfs25 Among the 105 volunteers vaccinated by direct venous inoculation (DVI),
antibodies were detected by ELISA in sera from subjects receiving two 12 volunteers (pilot safety group) have received 2 doses of PfSPZ Vaccine
or three doses of Pfs25-EPA/Alhydrogel®. The anti-Pfs25 antibody results (Day 0: 1.35x105 and Day 14: 2.7x105 PfSPZ) and 93 volunteers will
obtained following three vaccinations in the high dose (47 µg) Pfs25-EPA/ have received 5 doses of 2.7x105 PfSPZ or normal saline placebo (Day 0,
Alhydrogel® group in the US are comparable to the results seen following 28, 56, 84, 140; total dosage: 13.5x105 PfSPZ) by the end of July 2014.
three vaccinations in the high dose (47 µg) Pfs25-EPA/Alhydrogel® group Nine subjects in the pilot group will join the larger group to receive an
in Mali. The antibody response at each vaccine dose increased with additional 3 vaccinations (total dosage: 12.15x105 PfSPZ). The incidence
each subsequent dose of vaccine given but diminished quickly following and severity of local and systemic adverse events occurring within 7 days
vaccination. The percentage of responders with anti-Pfs25 antibody after dose are being recorded. During the malaria transmission season
responses at levels ≥546 units, which was the anti-Pfs25 antibody level all volunteers will be examined every 14 days and as clinically indicated
that had previously been seen to have functional activity in the US study, for blood-stage parasitemia by microscopy. All volunteers have been
was the same between the two studies following the second and third immunized twice. Immunizations have been well tolerated with no local
vaccination in the high dose groups. Anti-Pfs25 antibody response reactogenicity, minimal mild to moderate systemic reactogenicity, no
results following the fourth vaccination in the Mali study and associated serious adverse events, and no patent parasitemia. These early results
functional activity will be available in October 2014. Overall, Pfs25-EPA/ show PfSPZ Vaccine administered via DVI is safe and well tolerated in
Alhydrogel® transmission blocking vaccine has been well tolerated and healthy malaria-exposed, African adults. Results of all immunizations will
produced significant antibody responses in a malaria naïve and malaria be presented.
exposed adult populations.
670 671
Seif Shekalaghe1, Said Jongo1, Elena Moreno1, Omar Lweno1,
Ali Hamad1, Kamaka Kassim1, Omar Juma1, Conrad Gwandu1, Katie J. Ewer1, Carly Bliss1, Georgina Bowyer1, Muhammed
William Kato1, Caroline Mavere1, Ramla Rashid1, Jackson Mollel1, Afolabi2, Alfred Tiono3, Abdoulie Drammeh2, Issa Nebie3, Jankey
Maximillian Mpina1, Anneth Tumbo1, Catherine Mkindi1, Tobias Ya Jagne2, Jane Adetifa4, Momodou Cox2, Nick Edwards1, Jean
Rutishauser2, Isabelle Zenklusen2, Selina Joseph1, Mohammed Baptiste Yaro5, Susanne Hodgson1, Nick Anagnostou6, Katharine
Mgeni1, Claudia A. Daubenberger2, Peter F. Billingsley3, B. Kim Lee Collins1, Eleanor Berrie7, Sarah Moyle7, Sarah Gilbert1, Nicola
Sim3, Thomas L. Richie3, Marcel Tanner2, Salim Abdullah1, Stephen Viebig8, Rachel Roberts6, Alison Lawrie6, Egeruan Imoukhuede6,
L. Hoffman3 Katie Flanagan2, Beate Kampmann2, Philip Bejon9, Adrian Hill1,
Bagamoyo Clinical Trial Unit, Ifakara Health Insitute, Bagamoyo, United Sodiomon Sirima3, Kalifa Bojang2
Republic of Tanzania, 2Swiss Tropical and Public Health Institute, Basel, 1
The Jenner Institute, University of Oxford, Oxford, United Kingdom,
Switzerland, 3Sanaria Inc., Rockville, MD, United States 2
Medical Research Council Unit, Fajara, Gambia, 3Centre National de
The rich potential for African scientists to spearhead phase 1 studies that Recherche et de Formation sur le Paludisme, Ougadougou, Burkina
have a controlled protection component has not been tapped because Faso, 4Medical Research Council Unit, Faj, Gambia, 5Centre National de
controlled human malaria infections (CHMI) have been available only at Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso,
centers in the USA and Europe with access to infected mosquitoes. Sanaria
CCVTM, University of Oxford, Oxford, United Kingdom, 7CBF, University of
has developed aseptic, purified, cryopreserved infectious Plasmodium Oxford, Oxford, United Kingdom, 8European Vaccine Initiative, Heidelberg,
falciparum (Pf) sporozoites (SPZ) (PfSPZ Challenge) manufactured in Germany, 9Kenya Medical Research Institute, Kilifi, Kenya
compliance with cGMPs, suitable for parenteral injection and shippable Vaccination is one of the most cost-effective health care interventions
to any location. PfSPZ Challenge has been tested in the Netherlands, US, available and an effective malaria vaccine against Plasmodium falciparum
UK, Tanzania, Kenya, Germany and Spain using different dosages and could save more than half a million lives each year. We developed a
inoculation routes. 3,200 PfSPZ administered by direct venous inoculation prime-boost immunisation approach employing the viral vectors ChAd63
(DVI) reproduces the 100% infection rate and 11-11.5 day pre-patent and MVA, both encoding the pre-erythrocytic malaria antigen TRAP.
period of 5 mosquito bite CHMI. In the present, first of its kind study, Previous studies with ChAd63 MVA ME-TRAP have shown excellent
we will use PfSPZ Challenge to test the efficacy of Sanaria's radiation immunogenicity and significant efficacy in adults with protection
attenuated, non-replicating PfSPZ Vaccine against CHMI administered by correlated with frequency of mono-functional CD8+ T cells secreting
DVI. PfSPZ Vaccine showed 100% efficacy in a recent study by the Vaccine IFNγ. We report here T cell phenotypes and antibody titres measured in
Research Center (VRC), NIAID, NIH in the study group receiving the highest 138 children vaccinated during three Phase I dose-finding and age de-
dose tested (5 doses of 1.35x10^5 PfSPZ by DVI). The Bagamoyo Clinical escalation studies to assess safety and immunogenicity of the ChAd63
Trial Unit, Ifakara Health Institute, is now comparing the same regimen MVA ME-TRAP vaccine in malaria-exposed children in The Gambia and
shown to be 100% protective at VRC, with a regimen that delivers twice Burkina Faso. Age groups at first immunisation were 2-6 years, 5-12
the dose (2.7x10^5 PfSPZ) at each of the 5 time points, in minimally months and 10 weeks in The Gambia and 5-17 months in Burkina Faso.
malaria-exposed Tanzanian adults. Both groups will be assessed for IFNγ ELISPOT responses to TRAP were significantly lower in 2-6 year old
protection against CHMI using PfSPZ Challenge administered by DVI at 3 and 5-12 month old children in The Gambia and 5-17 month old children
and 24 weeks after the 5th dose (40 immunized and 8 control subjects). in Burkina Faso than in malaria-naïve UK adults receiving the same
An additional 6 volunteers will receive the higher dose and undergo CHMI vaccines. Immunogenicity in 10 week-old infants in The Gambia was high
only at 24 weeks. We will present safety, tolerability, and preliminary and comparable to that in adults. Flow cytometry revealed IFNγ secretion
immunogenicity data for this unique study that is opening an exciting from both CD4+ and CD8+ T cells with IL-2 and TNFα also detected from
pathway for malaria vaccine and drug research and development in Africa CD8+ T cells. Anti-TRAP IgG responses varied by age group and dose, with
and the world. significantly higher titres detected after boosting in vaccinees primed with
a higher dose of ChAd63 ME-TRAP. Titres were also significantly higher
in 5-12 month and 10 week old children than 2-6 year-old children in
The Gambia that received the same dose. IgG titres in 5-17 month-old
children in Burkina Faso were comparable to those in 5-12 month old
children in The Gambia. IgG responses were predominantly composed
of IgG1 and IgG3 isotypes and we also detected IgA and IgM responses.
We demonstrate excellent cellular and humoral immunogenicity of a
pre-erythrocytic malaria vaccine in key target populations for vaccine
Ruth O. Payne1, Kathryn H. Milne1, Sean C. Elias1, David
Llewellyn1, Nick J. Edwards1, Simone C. de Cassan1, Anna L.
Goodman1, Chetan E. Chitnis2, Alfredo Nicosia3, Sarah Moyle4,
Eleanor Berrie4, Alison M. Lawrie1, Adrian V. Hill1, Simon J. Draper1
University of Oxford, Oxford, United Kingdom, 2International Centre for
Genetic Engineering and Biotechnology, New Delhi, India, 3Okairos, Rome,
Italy, 4Clinical Biomanufacturing Facility, Oxford, United Kingdom
There has been comparatively little research into vaccines for Plasmodium
vivax in the past, with only two antigens previously reaching Phase Ia
clinical trials. More recently, the importance of a vaccine for P. vivax physical-chemical limitations of ELQ-300 to deliver the active drug to
has been recognised and included in the 2013 update to the Malaria the bloodstream at high enough concentrations sufficient for safety and
Vaccine Technology Roadmap. Here we report on the first blood-stage toxicology studies as well as achieving single dose cures.
P. vivax vaccine Phase Ia clinical trial. This has been carried out in Oxford
using recombinant simian adenovirus ChAd63 and the poxvirus MVA 674
encoding the P. vivax antigen PvDBP (Duffy-binding protein region II) in
a heterologous prime-boost regimen. The P. vivax parasite requires an UNDERSTANDING THE MECHANISM FOR EFFICACY AND
interaction between the Duffy-binding protein ligand and its host receptor, TOXICITY OF 8-AMINOQUINOLINE ANTIMALARIALS: IN
the Duffy antigen receptor for chemokines (DARC), in order to invade VITRO AND IN VIVO STUDIES WITH HYDROXYLATED
reticulocytes, making PvDBP a promising antigen for vaccine development. METABOLITES OF PRIMAQUINE
Twenty-three healthy volunteers have been vaccinated and followed
up in this Phase Ia dose escalation study of ChAd63-MVA PvDBP. The Babu L. Tekwani, Rajnish Sahu, Narayan D. Chaurasiya, N.P.
ChAd63 PvDBP priming vaccine was initially given alone to 4 volunteers Dhammika Nanayakkara, Larry A. Walker
at a dose of 5 x 109 vp before being increased to 5 x 1010 vp following University of Mississippi, University, MS, United States
a planned safety review. MVA PvDBP has been given to 15 volunteers 8 Hydroxylated metabolites are presumed to be responsible for toxicity
weeks after ChAd63 PvDBP prime at doses of 1 x 108 pfu – 2 x 108 pfu. and/or efficacy of primaquine and other 8-aminoquinoline antimalarials.
The primary objective of the study was safety, and the vaccines have been However, no definitive data are available on pharmacokinetics,
well tolerated with no serious adverse events. Follow-up of volunteers pharmacodynamics and in vivo plasma/tissue profiles of the hydroxylated
will be complete at the end of June 2014. The secondary objective was metabolites. Recent in vitro studies with primary human hepatocytes and
humoral and cellular immunogenicity which has been assessed using application of stable isotope (13C) labeled PQ provided evidences for
assays including PvDBP IFN-γ T cell ELISPOT, B cell ELISPOT, PvDBP IgG generation of hydroxylated metabolites presumably through CYP mediated
antibody ELISA and functional antibody analysis. The vaccine regimen is pathways. Previous studies by us have shown that 5-hydroxyprimaquine
immunogenic, with increases in the cellular and humoral responses seen (5-HPQ) and 6-Methoxy 8-N-Hydroxy aminoquinoline (MHQ) generated
after MVA PvDBP boost (compared with ChAd63 PvDBP alone). This is the robust methemoglobin formation and oxidative stress in normal and
first vaccine against PvDBP to be assessed in humans, and has shown a G6PD deficient human erythrocytes. Both 5-HPQ and MHQ produced
favourable safety profile and promising levels of immunogenicity which selective depletion of GSH in G6PD deficient erythrocytes. The studies
support onward clinical development towards proof-of-concept efficacy were extended to include 2-, 3-, 4- and 8-N-hydroxyprimaquine (8-NHPQ).
testing. Both 2-HPQ and 4-HPQ are relatively stable analogs. 2-HPQ and 4-HPQ did
not generate significant methemoglobin and only marginal ROS in normal
673 and G6PDD RBCs with & without microsomes. Neither metabolite showed
activity in vivo in the blood stage Plasmodium berghei mouse malaria
ELQ-300 PRODRUGS FOR ENHANCED DELIVERY AND model (i.v. route of administration). Until recently, no definite evidences
EFFICACY AGAINST MALARIA have been available regarding generation of 3-HPQ and/or 8-NHPQ in vivo
& in vitro. 3-HPQ can be further metabolized with pooled human liver
Galen P. Miley1, Sovitj Pou1, Rolf Winter1, Aaron Nilsen1, Yuexin
microsomes to generate more toxic/reactive species. 8-NHPQ is a reactive
Li1, Jane X. Kelly1, Allison Stickles2, Isaac P. Forquer1, Michael W.
metabolite, which generates significant methemoglobin and oxidative
Mather3, April Pershing3, Akhil B. Vaidya3, Karen White4, David
stress. Among 2-, 3-, 4- HPQ and 8-NHPQ, none affected GSH levels in
Shackleford4, Jessica Saunders4, Gong Chen4, Cassandra Noack4,
normal or G6PD-deficient human erythrocytes. Formation of 2- and 3-HPQ
Susan A. Charman4, Li-Min Ting5, Kami Kim5, Cristina Donini6,
metabolites was confirmed in vitro on incubation of PQ with recombinant
Jeremy N. Burrows6, Michael K. Riscoe2
human CYP2D6; another HPQ, perhaps 4-HPQ is also formed. However,
Veterans Affairs Medical Center, Portland, OR, United States, 2Oregon 2-HPQ, 3-HPQ and 4-HPQ metabolites appear not to be responsible for
Health & Science University, Portland, OR, United States, 3Drexel University toxicity/efficacy of PQ.
College of Medicine, Philadelphia, PA, United States, 4Monash University,
Parkville, Australia, 5Albert Einstein College of Medicine, New York, NY,
United States, 6Medicines for Malaria Venture, Geneva, Switzerland
ELQ-300 is a preclinical candidate of the Medicines for Malaria Venture A PHASE I/IB STUDY TO INVESTIGATE THE SAFETY,
that targets the liver and blood stages of malaria, as well as the forms that TOLERABILITY AND PHARMACOKINETIC PROFILE
are crucial to transmission of falciparum malaria: gametocytes, zygotes, OF DSM265 IN HEALTHY SUBJECTS AND THEN ITS
and ookinetes. In mouse models of the disease, a single oral dose of 0.03 ANTIMALARIAL ACTIVITY IN INDUCED BLOOD STAGE
mg/kg prevented sporozoite induced infections while 4 daily doses of 1 PLASMODIUM FALCIPARUM INFECTION
mg/kg achieved complete cures of patent infections. A significant obstacle
to the clinical development of ELQ-300 relates to its physical-chemical James S. McCarthy1, Julie Lotharius2, Anthony Dayan3,
properties. Its relatively poor water solubility and high crystallinity limits Margaret Phillips4, Kennan Marsh5, Don Walker6, Mark Baker2,
absorption to the degree that only low bloodstream concentrations can Suzanne Elliott7, Paul Griffin7, Caroline Ng8, David Fidock8, Lidiya
be achieved by oral dosing. While these low bloodstream concentrations Bebrevska2, Stephan Duparc2, Joerg Moehrle2, Thomas Rueckle2
are sufficient for therapy the levels are too low to establish an acceptable 1
QIMR Berghofer Medical Research Institute, Herston, Australia,
safety margin required by regulatory agencies for clinical development. 2
Medicines for Malaria, Geneva, Switzerland, 3University of London,
One way to address the challenging physical-chemical properties of London, United Kingdom, 4University of Texas Southwestern, Dallas,
ELQ-300 is through the development of prodrugs. In this presentation TX, United States, 5AbbVie, Lake Forest, IL, United States, 6Pfizer Global
we will profile a series of ELQ-300 prodrugs, focusing primarily on the Research and Development, Sandwich, United Kingdom, 7QPharm Pty Ltd,
bioreversible nature of ELQ-337. At the equivalent dose of 3 mg/kg the Herston, Australia, 8Columbia University, New York, NY, United States
delivery of ELQ-300 from ELQ-337 is enhanced by 4-5-fold, reaching a DSM265 is a new antimalarial that targets the malaria parasite's pyrimidine
Cmax of 6.9 micromolar by 4 hrs after oral administration. The superior in biosynthetic enzyme dihydrootate dehydrogenase (DHODH). A Phase I/
vivo efficacy of this compound will be discussed. Apart from highlighting Ib study was designed to collect safety, PK and efficacy data. It was
the outstanding in vivo efficacy of ELQ-337, this data demonstrates undertaken in two parts: the first comprised a single ascending dose (SAD)
that the prodrug strategy represents a viable approach to overcome the design to assess safety, pharmacokinetics, and the maximum tolerated
dose. Embedded within this first part was an assessment of food effect.
The second part comprised exploration of the antimalarial activity of
DSM265 in a single-dose cohort using the induced blood-stage malaria making it all the more critical to develop a means of protecting the long-
(IBSM) system at a dose guided by data from preclinical efficacy prediction term efficacy of compounds in the pipeline with combination strategies as
and emerging PK data. To date, 5 cohorts comprising 49 volunteers have discussed.
participated in the SAD up to 400mg, study of food effect, or the IBSM
phase. To date, no significant drug-related clinical or laboratory toxicity 677
have been observed. Fitting of a population PK model to the data indicates
mono-exponential disposition, with a blood clearance/f of 0.45 L/hr NON-INFERIORITY CLINICAL TRIAL COMPARING FIXED-DOSE
(95%CI: 0.41-0.50), and an elimination t1/2 of 91 hrs. DSM265 shows COMBINATION AND CHLOROQUINE FOR PLASMODIUM
dose proportionality, both in terms of Cmax and AUCinf. No food effect VIVAX UNCOMPLICATED INFECTION IN THE BRAZILIAN
was observed. A dose of 150 mg was selected for the IBSM phase by AMAZON
combining the MPC predicted from preclinical data (0.5-1 µg/mL) with
the human PK, aiming to observe parasite clearance kinetics, including André M. Siqueira1, Aline Alencar1, Belisa Magalhães2, Gisely
recrudescence. When tested in the IBSM system in 7 healthy volunteers, Melo2, Kim Machado1, Valérie Lameyre3, Cláudio T. Daniel-
the drug showed encouraging antimalarial activity with 99.9% parasite Ribeiro4, Marcus V. Lacerda1
clearance by 130 hrs, with recrudescent infection observed in 5/7 subjects 1
Fundacao de Medicina Tropical Heitor Vieira Dourado, Manaus - AM,
between 10 and 21 days after drug administration. No mutations in Brazil, 2Universidade do Estado do Amazonas, Manaus - AM, Brazil,
the DHODH gene were observed in recrudescent parasites. Fitting of a 3
Access to Medicines, Sanofi Aventis, Paris, France, 4Fundacao Oswaldo
population PK/PD model to the parasitemia data led to an estimate of Cruz, Rio de Janeiro, Brazil
the MPC of 954 ng/mL (95%CI: 678-1267). Population estimates of PRR In Latin America, Plasmodium vivax is responsible for around 80% of
and parasitemia t1/2 were 2.2 (95%CI: 2.0-2.7) and 6.6 hrs (95%CI: 5.4 malaria episodes. As Chloroquine (CQ) efficacy decreases, alternative
- 7.2) respectively. These results demonstrate that it is possible to obtain therapies such as artemisinin-based combinations recommended by
well characterised efficacy data early in the clinical development of an WHO must be evaluated. This phase III, noninferiority randomized trial,
anti-malarial. The combination of early safety, PK, and efficacy data with compared the antischizontocidal efficacy and safety of a 3 days supervised
the PK/PD model mean that future clinical trials of DSM265 will benefit treatment of the fixed-dose artesunate-amodiaquine Winthrop® (ASAQ)
by being smaller and focused towards confirming the observed efficacy. versus CQ for the treatment of uncomplicated P.vivax infection in children
The observed duration of action of DSM265 suggests its promise as a above 6 months-old and adults. Primary endpoint was the efficacy rate
component of a new combination single-dose treatment for malaria. at day 28. Patients were followed-up until day 42. 380 patients were
included in Manaus, Brazil. Baseline characteristics and dropout rates
676 were similar between arms. In Per-Protocol analysis, adequate clinical
and parasitological response (ACPR) at day 28 was achieved in 100%
TARGETING DRUG RESISTANCE: HARNESSING and 92.4% of patients in the ASAQ and CQ arm (93.7% versus 89.5%
EVOLUTIONARY FITNESS IN PLASMODIUM FALCIPARUM FOR in the Intention-To-Treat analysis). Non-inferiority was achieved in both
DRUG DISCOVERY populations and subsequent bilateral tests concluded in superiority of
ASAQ (p=0.001% and < 0.001% in ITT and PP analysis respectively).
Amanda K. Lukens1, Pamela A. Magistrado2, Jordan C. Canedy3,
Clearance of parasite from D1 to D3 was observed in significantly more
Leila S. Ross2, Ulf E. Ribacke4, Jonathan D. Herman5, Ralph
patients (p<0.001) and significantly more patients were afebrile at D1
Mazitschek5, Roger C. Wiegand1, Dyann F. Wirth2
(p=0.001) in the ASAQ group. A significant reduction in the number
The Broad Institute, Cambridge, MA, United States, 2Harvard School of of gametocyte carriers was also observed in the ASAQ group versus
Public Health, Boston, MA, United States, 3Harvard University, Cambridge, CQ group during follow-up. A significant difference in the proportion
MA, United States, 4Uppsala University, Uppsala, Sweden, 5Harvard of recurrence during the 42 days of follow-up was also observed
Medical School, Boston, MA, United States (26.5% versus 3.9% in the CQ versus ASAQ groups, p<0.001). 79% of
Management of drug resistance with combination therapies is key to recurrences in the CQ arm, and all in the ASAQ, occurred after D28. The
prolonging the effectiveness of new antimalarials. Typical combination occurrence of emergent adverse events (AEs) was similar in both arms
therapies pair drugs that are each effective as monotherapies and employ (CQ=115; ASAQ=110), with no serious AE in the CQ and 5 (related to 3
differing binding sites. Pairing drugs that target independent sites presents patients) in the ASAQ arms. ASAQ is a safe and efficacious alternative to
the opportunity for the parasite to individually develop resistance to treat uncomplicated P. vivax infection. 42-days-follow-up enables better
each drug, rendering the combination ineffective. Here we explore new assessment of CQ efficacy. Microsatellite genotyping correction and CQ
kinds of antimalarial combination therapies where the changes giving levels results will be presented.
rise to resistance become the target for the second drug. This approach
incorporates built-in protection for the partner drug from development 678
of resistance. In the wild-type organism the partner drug has little or no
effect and the organism is not subject to selective pressure to develop QTC PROLONGATION AND DRUG SAFETY OF AN INCREASED
resistance. When resistant mutants to the first drug occur then, and only DOSE OF DIHYDROARTEMISININ-PIPERAQUINE IN YOUNG
then, does the second drug act, greatly diminishing the population subject CHILDREN 5-24 KG IN MALAWI
to selection. In the event that mutations occur conveying resistance to
the second drug, those mutations will drive the organism back towards Eva Maria Hodel1, Gertrude Chapotera-Kalanda2, Tikhala
sensitivity to the first drug. We have taken a systematic approach in the Makhaza-Jere3, Clyton A. Munthali2, Mavuto Mukaka3, Queen
study of resistant organisms and their unique susceptibilities. We screened Dube3, Cheryl Pace1, Karen I. Barnes4, David G. Lalloo1, Dianne J.
the Malaria Box against a panel of mutant parasites with well-defined Terlouw3
resistance mechanisms to identify compounds with differential activity 1
Liverpool School of Tropical Medicine, Liverpool, United Kingdom,
between mutant and wild-type parasites. We show that a significant 2
College of Medicine, Blantyre, Malawi, 3Malawi-Liverpool-Wellcome Trust
percentage of the Malaria Box targets one of the pathways tested. In Clinical Programme, Blantyre, Malawi, 4University of Cape Town, Cape
particular, we find a number of compounds with negative cross-resistance, Town, South Africa
representing promising leads in pursuing inhibitor pairs as described Dihydroartemisinin-piperaquine (DHA-PPQ) is recommended for the
above. Importantly, multiple chemotypes inhibit each target, indicating treatment of uncomplicated falciparum malaria and is being explored as
there are overlapping modes of action in the parasite despite broad mass drug administration to reduce transmission. Recent pharmacokinetic
chemotypic diversity in the compound set. This suggests the parasite has a (PK) studies and a pooled meta-analysis of individual patient efficacy data
limited number of chokepoints that can be exploited in drug development by the WorldWide Antimalarial Resistance Network have raised concerns
about potential under-dosing of young children with current weight-based 680
dose recommendations and advocated higher dosing regimens in this
vulnerable population. In contrast, the European Medicines Agency has ECOLOGICAL GENOMICS AND PLASTICITY OF GENETIC
called for more data to substantiate the cardiac safety of DHA-PPQ and REGULATION FOR SALTWATER TOLERANCE
its effect on QTc intervals. We conducted an open-label dose optimization
study aimed at describing the population PK profile of PPQ and the Hilary A. Smith, Nora J. Besansky, Changde Cheng
tolerability of a higher dose regimen of DHA-PPQ in children of 5–24 kg University of Notre Dame, Notre Dame, IN, United States
with uncomplicated falciparum malaria [PACTR201303000506302]. In the Evolution of osmoregulatory systems is a key factor in the transition of
first step of the study, 100 children received a dosing regimen based on species between fresh- and saltwater habitats, including anopheline
supervised treatment with doses of 1.7–3.8 mg/kg DHA and 13.6–30.0 mosquitoes known for their role as disease vectors. Here we use RNA-
mg/kg PPQ given once daily over three days, using whole or half-tablets Seq to investigate gene expression differences between an obligate
(20/160 mg and 40/320 mg DHA/PPQ tablets); children were followed-up freshwater (Anopheles coluzzii) and euryhaline malaria vector (An. merus).
for 63 days. In the second step 100 children received a more pragmatic After rearing in freshwater (FW), both young and old larval instars of
regimen using whole tablets with wider ranging doses of 2.0–4.0 mg/kg each species were briefly (6 h) exposed to either saltwater (SW) or FW
DHA and 16.2–32.0 mg/kg PPQ. QTc was measured 4–6 h after the last conditions to test the impact of water salinity on mRNA levels. We aimed
DHA-PPQ dose and compared to baseline and Day 28 using digital 12-lead to describe the transcriptomic response of anophelines to water salinity,
electrocardiograms and the vertical caliper on median overlapped template and how the response differs between An. merus and An. coluzzii. We
technique. We will present findings from the first step. Findings from the also tested how the transcriptomic response to water salinity differs
second step will be presented, dependent on study progress. Optimising with age, particularly for the tolerant species An. merus. Our results are
the weight-based dose regimen for DHA-PPQ in the main high-risk group congruent with the ability of gene induction to mediate SW tolerance,
of young children ahead of its roll-out into control programmes in sub- with the intolerant An. coluzzii exhibiting little difference in gene
Saharan Africa will help inform the translation of dosing recommendations expression (<2% of the transcriptome), in contrast to greater plasticity by
into programmatically feasible, user-friendly, safe weight- and age-based An. merus. In the latter, >16% of the 11,025 genes assayed responded
dosing regimens. to saltwater exposure, with similar levels of up- and down-regulation. The
impact of age at exposure was less dramatic than species identity, with
679 567 genes significantly differentially expressed in response to water type
between young and old An. merus. Besides effector genes with putative
SCHEDULED SCREENING VERSUS PREVENTIVE TREATMENT roles in ion transport (e.g., Na+/K+-ATPase), we also report differential
FOR THE CONTROL OF MALARIA IN PREGNANCY IN expression in response to water salinity by genes involved in general stress
MALAWI: A RANDOMIZED CONTROLLED TRIAL responses such as heat shock proteins, and potential cross-talk between
the immune response and osmoregulation. Additionally, we report on a
Mwayiwawo Madanitsa1, Linda Kalilani-Phiri1, Victor
network of 115 co-expressed genes associated with SW tolerance. Finally,
Mwapasa1, Stephen Rogerson2, Steve Taylor3, Steve Meshnick4,
we complement our investigation of gene expression with QTL mapping
Annemieke van Eijk5, Feiko ter Kuile5
from a backcross of An. merus and An. coluzzii. We report regions of
College of Medicine, University of Malawi, Blantyre, Malawi, 2University sequence divergence associated with SW tolerance, and discuss the
of Melbourne, Melbourne, Australia, 3Duke University Medical Center, presence of differentially expressed genes within these regions.
Durham, NC, United States, 4University of North Carolina, Wilmington, NC,
United States, 5Liverpool School of Tropical Medicine, Liverpool, United
The decline in effectiveness of intermittent preventive treatment A COMPARATIVE APPROACH TO IDENTIFY PATHWAYS
in pregnancy with SP (IPTp-SP) due to high levels of sulphadoxine- REGULATING FEMALE REPRODUCTIVE BIOLOGY IN
pyrimethamine (SP) resistance by Plasmodium falciparum malaria ANOPHELINE MALARIA VECTORS
parasites necessitates urgent alternative approaches for malaria control in
pregnancy. The objectives of this study is to determine whether scheduled Sara N. Mitchell1, Evdoxia Kakani1, Paul Howell2, Flaminia
intermittent screening with a malaria rapid diagnostic test (mRDT) and Catteruccia1
treatment of mRDT-positive women with Dihydroartemesinin-Piperaquine 1
Harvard School of Public Health, Boston, MA, United States, 2MR4 at
(ISTp-DP) from the second trimesters is more efficacious than IPTp-SP in Centers of Disease Control and Prevention, Atlanta, GA, United States
reducing adverse birth outcomes and malaria infection at term among Female Anopheles gambiae mosquitoes exhibit major behavioral and
HIV-sero-negative women protected by insecticide-treated bed nets physiological changes in the first 24 hours after mating, including egg
in a malaria endemic setting. This two arm, open label, multicentre, laying and refractoriness to further mating. These post-mating responses
randomized controlled superiority trial was designed to assess a 25% or are in part mediated by transfer of seminal secretions contained in the
greater reduction in adverse birth outcome in primi- and secundigravidae mating plug, a complex of proteins, lipids and hormones, formed in the
and a 25% or greater reduction in placental malaria in multigravidae. male, and deposited in the female atrium (uterus) during mating. However,
Between July, 2011 and March, 2013, a total of 1,155 and 717 women in not all Anophelines produce and transfer a plug, with this structure absent
their first and second pregnancy and third to fifth pregnancy respectively in the Nyssorhynchus mosquito series (Anopheles albimanus). This raises
were recruited from 3 sites of perennial malaria transmission with high the question of how female post-mating changes are induced in absence
grade SP resistance and near saturation of the dihydropteroate synthase/ of a plug? To address this question, we compared the molecular processes
dihydrofolate reductase quintuple haplotype. Of 3,214 women screened underpinning the mating responses of An. gambiae and An. albimanus
1,872 (58.2%) were enrolled. 92% of participants were retained to females via RNAseq analysis of the atrium. A significantly larger response
delivery and 90.5% to study completion. was observed in An. gambiae after mating (2235 genes, p<0.05) than
in An. albimanus (212). Comparison of seminal secretions from the two
species indicates that this >10-fold increase in An. gambiae response may
be due to the transfer of potent transcriptional regulators. Enrichment
analysis (DAVID) identified pathways of epithelial transport and molecule
trafficking regulated in both species, suggesting the exchange of material
across the atrium epithelium. Among the genes exclusively modulated in
An. gambiae, were proteins associated with mating plug processing and
energy production, suggestive of high-energy demands in mated females,
while in An. albimanus enriched processes included chitin metabolism, of lncRNAs in An. gambiae offers the first [large-scale] insights into non-
which may indicate structural changes to the uterus after mating, as coding RNAs in this mosquito and defines another potential set of targets
well as carboxylesterase activity suggestive of xenobiotic metabolism. for the development of vector-based interventions that may curb the
This comparison provides important insight into the different pathways malaria burden in disease-endemic countries.
shaping female post-mating behavior in An. gambiae and An. albimanus.
Ultimately, a better understanding of Anopheline reproductive biology will 684
aid vector control efforts aimed at reducing mosquito fertility, and may
highlight conserved reproductive pathways that could be targeted in all THE EXPRESSION OF THE PIRNA PATHWAY GENES, PIWI,
malaria vectors worldwide. AUBERGINE AND ARGONAUT 3, DURING HEAT AND
PFS47 ROLE IN THE ADAPTATION OF PLASMODIUM Vanessa M. Macias, Kelcie Martin, Anthony A. James
FALCIPARUM TO NEW WORLD ANOPHELINES University of California Irvine, Irvine, CA, United States
Stress-induced mobilization of transposons is well-documented in many
Alvaro Molina-Cruz, Nitin Kamath, Emma Taylor-Salmon,
organisms. An RNA-interference pathway, designated the piRNA pathway,
Rebecca Greene, Gaspar Canepa, Ashley Haile, Jose Luis Ramirez,
is responsible for repressing transposon mobilization in germ-line tissues
Urvashi Ramphul, Carolina Barillas-Mury
of the fruit fly, Drosophila melanogaster. The genes encoding the
Laboratory of Malaria and Vector Research/National Institute of Allergy components of the piRNA pathway, Piwi, Aubergine (Aub) and Argonaut 3
and Infectious Diseases/National Institutes of Health, Bethesda, MD, (Ago3), were identified and characterized in the malaria vector mosquito,
United States Anopheles stephensi. Preliminary experiments show that they are induced
The Pfs47 gene, a member of the 6-cys protein family, is required by in embryos following heat or cold stress. Current experiments in adult
Plasmodium falciparum to evade the Anopheles gambiae immune system. female mosquitoes are designed to assay the effects of heat and cold
This led us to propose that Pfs47 may be important for the malaria parasite stress on the expression levels of the mosquito orthologs of the heat-shock
adaptation to different Anopheline mosquitos around the world. Pfs47 is protein genes, hsp70 and hsp90, as well as Piwi, Aub and Ago3 and
a polymorphic gene with signatures of diversifying selection and a strong endogenous transposase genes. Additionally, mosquitoes mutant for Piwi,
geographic genetic structure. The highest genetic diversity of Pfs47 was Aub and Ago3 are being generated and will be tested for a phenotype
detected in Africa, and the lowest diversity was detected in the New World affecting the heat-shock response. The results of this work are expected
with one haplotype. Phylogenetic analysis of Pfs47 haplotype sequences to inform the development of transposon-based gene-drive systems for
present a geographic structure with most African haplotypes forming a introgressing beneficial traits into vector mosquitoes.
clade separate from most of the Asian alleles. The haplotype found in
the New World appears to be more closely related to the African clade. 685
Infection of the New World malaria vector A. albimanus with P. falciparum
was found to be highly dependent on the geographic origin of the THE ROLE OF INSECT INNATE IMMUNITY IN CONTROLLING
parasite strain. The A. albimanus mosquito immune system was found to RICKETTSIA TYPHI INFECTION
be responsible for the low infectivity found in African P. falciparum NF54
infections. Allele replacement showed that a Pfs47 haplotype from the Kristen E. Rennoll-Bankert, Abdu F. Azad
New World can rescue the NF54 parasite infection of A. albimanus. This University of Maryland, School of Medicine, Baltimore, MD, United States
provides evidence that the mosquito immune system can be an important Rickettsia typhi, the causative agent of murine typhus, is an obligate
barrier for adaptation of P. falciparum to new vectors and that selection of intracytosolic bacterium that is transmitted by the flea. Upon infection, R.
particular Pfs47 haplotypes may be required to overcome this barrier. typhi systemically infects fleas. However, infection level is kept manageable
so that flea fitness is unaffected, presumably by the flea innate immune
683 system. Two main arthropod innate immune signaling pathways, the Imd
and Toll pathways, respond to Gram-negative bacteria and Gram-positive
DISCOVERY OF NOVEL LONG NON-CODING RNAS AND bacteria/fungi, respectively. Upon activation by the Imd or Toll pathway,
PROTEIN-CODING GENES IN ANOPHELES GAMBIAE USING Rel/NF-KB transcription factors Relish and Dorsal/DIF increase transcription
DEEP RNA SEQUENCING of antimicrobial peptides. The immune pathways that control R. typhi
infection in the flea have yet to be elucidated. We hypothesize that the
Adam M. Jenkins1, Robert M. Waterhouse2, Alan S. Kopin3, Marc
Imd pathway is critical for controlling Gram-negative R. typhi burden
A. Muskavitch4
within the flea. Dissecting the flea immune response to R. typhi has been
Boston College, Chestnut Hill, MA, United States, 2Massachusetts Institute hampered by the lack of a flea genome. Therefore, R. typhi infection
of Technology, Cambridge, MA, United States, 3Tufts Medical Center, was modeled in Drosophila S2R+ cells. R. typhi infected and replicated
Boston, MA, United States, 4Biogen Idec, Cambridge, MA, United States within S2R+ cells. To identify which innate immune signaling pathway(s) is
Recently, an expanding class of long non-coding RNAs (lncRNAs) that critical for controlling R. typhi burden, S2R+ cells were treated with dsRNA
function in epigenetic regulation, the regulation of gene expression to knockdown either the Imd or Toll pathway. Knockdown of negative
transcriptionally and post-transcriptionally, and the regulation of genomic regulators caspar and cactus, of the Imd and Toll pathways, decreased R.
stability have been described in mammals, Drosophila melanogaster and typhi burden suggesting both the Imd and Toll pathways control R. typhi
Caenorhabditis elegans. We have analyzed the transcriptome of the burden. Knockdown of the NF-KB factor Relish but not Dorsal increased
malaria vector Anopheles gambiae, based on deep-read RNA sequencing R. typhi burden, further confirming the role of the Imd pathway in control
technology that generated over 500,000,000 reads from first and third of R. typhi burden. More extensive screens will provide further evidence of
instar larvae and adult females and males. Our de novo transcriptome which pathway(s) is controlling R. typhi burden. Additionally, a flea dorsal-
assembly, and comparisons with gene models defined in VectorBase like sequence has been identified and we are working to identify a flea
annotation Release 3.7, revealed over 1,100 novel lncRNAs and more than relish-like sequence in hopes of parlaying the knowledge garnered from
200 previously unannotated putative protein-coding genes. The lncRNAs the Drosophila model into the flea. Identification of immune pathways in
exhibit differential expression across life stages of the mosquito and display the flea and understanding the flea innate immune response to R. typhi
an increased rate of divergence over evolutionary time across the genus could potentially lead to new treatment modalities that will decrease
Anopheles when compared to the newly discovered protein-coding genes transmission and burden in the flea.
and previously annotated protein-coding genes. This initial description
686 immunodominant ts-specific T cells. These results provide insights into
previously unappreciated events in intracellular invasion by T. cruzi and
SIRNA NANOPARTICLE-MEDIATED TARGETING OF suggest that the transgenic over-expression of appropriate endogenous
DOUBLESEX, A REGULATOR OF SEX-SPECIFIC DEVELOPMENT proteins may significantly improve the protective capacity of viral vector
IN AEDES AEGYPTI based or live attenuated vaccines for T. cruzi and perhaps other pathogens.
associated with intermediate states in the promastigote to amastigote CD8 and CD4 T cell responses, respectively. In silico screening for putative
transition not seen under normal circumstances. We have employed epitopes binding to DRB1 molecules can identify multiple epitopes per
different techniques to characterize these forms such as morphological single parasite antigen. Our quest here is to determine what actually
analysis by microscopy and FACS, and gene expression analysis by qRT- occurs during the course of a complex infection in vivo. We are using
PCR. We have also generated reporter plasmids expressing fluorescent in silico prediction tools in an effort to understand more about the
proteins under the control of promastigote and amastigote specific processes that direct antigen selection and binding to different DRB1
promoters to follow the transition between the two forms in response to molecules during natural leishmanial infection. This will be done in concert
the typical heat and pH as well as in the presence of the Hsp90 inhibitor. with analysis of naturally processed leishmanial peptides. A previously
Finally, proteomic analysis of promastigotes, amastigotes and intermediate conducted GWAS and further sequence based haplotyping on an Indian
forms has helped us proposed effector proteins responsible for the parasite population has indicated HLA class II as a major genetic risk factor for
transition. Ultimately, these signaling molecules will represent potential visceral leishmaniasis(VL) and revealed DRB1*13/14 and DRB1*15/16
drug targets against leishmaniasis, a neglected disease that badly needs as risk and protective alleles, respectively in VL. In a preliminary study,
new therapeutic options. we have obtained data on leishmanial epitopes predicted to bind to
DRB1*13/*14 risk vs DRB1*15/*16 protective class II molecules using the
690 in-silico predictive tool NetMHCIIpan v2.1. Data for overlapping 9-mer
epitopes has been generated for 43 known Leishmania antigens (antigens
A NOVEL FIELD-APPLICABLE MOLECULAR TEST FOR of diagnostic value, vaccine candidates) and we have found peptides
VISCERAL LEISHMANIASIS exclusively binding to risk as well as protective group and also some
differentially binding peptides. Functional validation of these peptides
Alejandro Castellanos-Gonzalez1, Omar Saldarriaga1, Lilian will be done by measuring immune response against these antigens in
Tartaglino2, Rosana Gacek3, Ayesha Irani1, Peter C Melby1, Bruno individuals carrying different allele group from endemic region in India.
Travi1 This will pave the way for appropriate vaccine candidates which can drive
University of Texas Medical Branch, Galveston, TX, United States, the immune response to protective response in genetically susceptible
Secretaria de Calidad de Vida, Posadas, Argentina, 3Instituto Municipal de individuals.
Sanidad Animal, Posadas, Argentina
In the Americas there are several thousand reported annual cases of full 692
blown visceral leishmaniasis (VL) and mortality ranges between 7 and
10%. Furthermore, underreporting of VL is underestimating the actual USE OF CLINICAL PREDICTORS AND MOLECULAR DIAGNOSIS
disease burden. American VL is a zoonotic disease produced by Leishmania TO IDENTIFY THE SPECIES RESPONSIBLE FOR SNAKEBITE IN
infantum and transmitted between dogs and humans by urbanized sand RURAL NEPAL
flies. Dogs are the principal reservoir hosts and, therefore, are critical
targets for controlling urban transmission. The rK39® serological test is Sanjib K. Sharma1, Ulrich Kuch2, Patrick Höde2, Laura Bruhse2, Deb
widely used to identify and remove infected dogs from the transmission Pandey2, François Chappuis3, Emilie Alirol3
cycle, but it has low sensitivity (<33%) to detect subclinically infected B.P. Koirala Institute of Health Sciences, Dharan, Nepal,
dogs. The lack of sensitivity of serological tests is considered as the Forschungszentrum Biodiversität und Klima (Bio+C), Frankfurt am Main,
main reason for the inefficacy of control programs. We have developed Germany, 3Geneva University Hospital, Geneva, Switzerland
a sensitive and specific molecular test to detect L. infantum using a Snakebite is an important medical emergency in rural Nepal. Correct
Recombinase Polymerase Amplification method coupled with Lateral flow identification of the biting species is crucial for clinicians to choose
reading (RPA-LF). This innovative isothermal amplification test is as sensitive appropriate treatment and anticipate complications. This is particularly
as real time PCR (gold standard) but it does not require sophisticated important for neurotoxic envenomation which, depending on the
equipment, is fast, and the result is read with the naked eye. This makes it responsible species, may not respond to antivenoms. Adequate species
ideal for point of care diagnosis and field epidemiology studies. In the lab identification tools are lacking. This study used a combination of
RAP-LF detected <2 parasites in blood samples. Furthermore, evaluation morphological and molecular approaches (PCR-aided DNA sequencing
of dog blood samples from an endemic area showed that RPA-LF detected from swabs of bite sites) to determine the relative contribution of
more subclinically infected dogs than rK39 (51.9% vs. 14.3% positivity, venomous and non-venomous species to the snakebite burden in southern
respectively; p= 0.01). The RPA-LF fills the need for an effective diagnostic Nepal. The study also investigated the performance of baseline patient
tool that will play a critical role in control interventions to reduce urban history and clinical characteristics to distinguish between cobra (Naja
transmission of visceral leishmaniasis to humans. spp.) and krait (Bungarus spp.) bites. Out of 749 patients admitted to
one of the 3 study centres with a history of snakebite, the biting species
691 could be identified in 194 (25.9%). Out of these, 87 had been bitten
by a venomous species, most commonly Naja naja (n=42) and Bungarus
IDENTIFYING VACCINE CANDIDATES FOR VISCERAL caeruleus (n= 22). When both morphological identification and PCR/
LEISHMANIASIS sequencing results were available, a 100% agreement was noted. Among
patients bitten by venomous snakes, 71 (81.6%) presented with signs of
Toolika Singh1, Michaela Fakiola2, Joyce Oommen3, Jaya
envenomation including neurotoxic signs in 55 (77.4%). Being bitten at
Chakravarty1, Shyam Sundar1, Jenefer Blackwell3
night (OR= ∞), while sleeping (OR= 56 [95%CI= 9.9-318.2]), indoors (OR=
Institute of Medical Sciences, Varanasi, India, 2Cambridge Institute for 9.4 [95% CI= 1.9-46.9]), and presenting with abdominal pain (OR= 23.4
Medical Research, University of Cambridge, Cambridge, United Kingdom, [95% CI=3.8-142.5]) was associated with krait bite, and local signs of
Telethon Institute for Child Health Research, Perth, Australia envenomation (e.g., edema) with bites by cobras and pit vipers. This study
Leishmaniasis, a neglected tropical disease, prevalent in developing is the first to report the use of forensic genetics methods for snake species
countries with 90% of them in Asia (Bangladesh, India, and Nepal), identification in a prospective clinical study, and to identify epidemiological
Sudan, Ethiopia and Brazil. The technical challenges and the complexity and clinical features associated with krait and cobra envenomation in
in the immunity against the parasites clearly contribute to the absence Nepal, thereby providing decisive guidance to improve patient care.
of vaccines. A major challenge in human vaccine design is to overcome
variation in immune response in a genetically heterogeneous population.
This is largely determined by genetic heterogeneity in processing and
presentation of Ag to T cells, the outcome of which is dependent on
binding of T cell epitopes to HLA class I and class II molecules that drive
693 Their sera were screened with Rose Bengal plate test (RBPT) and positive
cases were subjected to Enzyme Linked Immunosorbent Assay (ELISA) to
MULTIPLEX PCR DETECTION OF ENTEROPATHOGENS confirm and detect evolution of the infection. A total of 250 suspected
CAUSING TRAVELERS' DIARRHEA FROM SPIKED STOOL cases were enrolled and 50(20%) were confirmed positive. There were
SMEARS ON WHATMAN FTA CARDS USING MULTIPLEX PCR 131 males and 119 females. Mean age was 24years+16. Sensitivity and
specificity were 90% and 85%. Of the 50 cases, 31(62%) were males;
Michele Tisdale1, David Tribble2, Chansuda Wongsrichanalai3, clinical signs consistent were recurrent fever (p 0.04), cough/sneeze (p
Jason Maguire1, Tahaniyat Lalani1 0.02) and osteomyelitis (p 0.00). Risk factors for human brucellosis were
IDCRP, Portsmouth, VA, United States, 2IDCRP, Bethesda, MD, United consumption of fresh milk (p 0.02) and local yoghurt kindirmo (p 0.00),
States, 3United States Agency for International Development Regional keeping goats (p 0.00), assisting animal parturition (p 0.01), processing
Development Mission for Asia, Bangkok, Thailand and eating raw meat (p 0.03 and p 0.00). Thirty six (72%) of the 50 cases
Molecular diagnostics offer significant advantages over conventional were positive by IgG thus chronic infection. Diagnosis of human brucellosis
testing for enteropathogen detection in travelers' diarrhea. There is limited is missed in hospitals in Kano. Risk factors identified were processing and
data on the performance of PCR assays using stool samples and smeared consumption of unprocessed milk and meat; keeping goats and assisting
stool cards. We sought to determine the limits of detection (LoD) for parturition. Authorities should educate the populace on the risks of this
diarrheal pathogens using a multiplex PCR assay on spiked stool samples, disease and its prevention; physicians should raise the index for diagnosis
and spiked stool smeared onto Whatman FTA® Elute cards. The multiplex of human brucellosis in patients that present with signs suggestive of it.
PCR panel used a combination of Luminex xTAG analyte-specific reagents
(ASRs) and in-house primers to detect: enterotoxigenic Escherichia coli 695
(ETEC), enteroaggregative E coli (EAEC), enterohemorrhagic E coli (EHEC),
Shigella spp., Salmonella enteritidis, S typhimurium, Campylobacter REAL-TIME QUANTITATIVE PCR SURVEILLANCE OF
spp., norovirus [GI, GII], Giardia lamblia and Cryptosporidium spp. LoD GASTROINTESTINAL PARASITES IN A SYMPTOMATIC RURAL
analysis was carried out by performing serial 1:10 dilutions, with the ARGENTINIAN POPULATION: INITIAL RESULTS OF THE LATIN
4th and 5th dilution performed in triplicate. We evaluated the impact AMERICAN MULTICENTER PARASITE STUDY (LAMPS)
of prolonged storage of stool cards (1 and 3 months) on the LoD. The
Rojelio Mejia1, Paola Vargas2, Rebecca Jeun1, Alejandro
mean fluorescence intensity value for detection was ≥300. LoDs in spiked
Krolewiecki2, Marisa Juarez2, Pamela Cajal2, Julio Nasser2, Peter
stool ranged from 102 to 104 cfu/g for bacterial pathogens, 102 to 103
Hotez1, Rubén Cimino2
pfu/g for Norovirus GI and GII respectively and 103 cysts/g for Giardia.
Cryptosporidium could not be reliably detected in the stool or stool
National School of Tropical Medicine, Houston, TX, United States,
card. The LoD for ETEC, EHEC and S enteritidis were similar in the stool
Universidad Nacional de Salta, Salta, Argentina
card and spiked stool, while the LoD for EAEC, S typhimurium, Shigella, There are over 2 billion people infected with gastrointestinal (GI) parasites.
Campylobacter and norovirus GII were 1 log higher in smeared stool cards Diagnosis of GI parasites relies on stool microscopy that has low diagnostic
compared to stool. Giardia had a lower LoD in the stool card (1 cyst/g). sensitivity and specificity. To better understand the parasitic etiology of
Significant variability (2-4 logs) in the LoDs was observed with prolonged abdominal symptoms, we implemented our rapid, high throughput, multi-
storage of stool cards. LoDs for S enteritidis and ETEC increased from parallel quantitative real-time PCR (qPCR) for the 8 common GI parasites
101 cfu/g at 1 month to 103 cfu/g at 3 months, while EHEC decreased including the helminths, Ascaris lumbricoides (Al), Ancylostoma duodenale
from 105 cfu/g to 101 cfu/g during the same time-points. Campylobacter (Ad), Necator americanus (Na), Strongyloides stercoralis (Ss), Trichuris
increased from 104 cfu/g at baseline to 105 cfu/g at 1 month and could trichiura (Tt) and protozoa, Cryptosporidium parvum (Cp), Entamoeba
not be detected at 3 months. Further evaluation of the multiplex PCR histolytica (Eh) and Giardia lamblia (Gl). This assay was used to analyze
assay using spiked specimens and diarrheal samples is needed before stool samples collected from 99 patients seen in a rural Argentinian clinic.
deployment in field studies. For Al, qPCR identified (56.6%) positives whereas McMaster's microscopy
technique identified (47.5%) with 91.3% sensitivity and 90.5% negative
predictive value (NPV). For hookworm, there was 37.4% detected by qPCR
694 compared to 22.2% by microscopy (p < 0.05), with a 95.5% sensitivity
and 98.4% NPV. Hookworm ova are indistinguishable by microscopy,
but qPCR is species specific. While Na was the predominate hookworm
detected, Ad DNA was detected in higher concentrations (0.61 versus
NIGERIA 2011 119.6 fg/µL, p < 0.0001). This has important implications, since Ad is
Aisha N. Isa1, Emmanuel C. Okolocha2, Junaid Kabir2 more aggressive in causing anemia. The difference between qPCR and
microscopy was dramatically seen for Gl (63.6% versus 8.1%) with 55
Federal Ministry of Agriculture and Natural Resources, Abuja, Nigeria,
additional positives for Gl (p = 0.001). For Ss, qPCR identified (21.2%)
Ahmadu Bello University, Zaria, Kaduna State, Nigeria
positives whereas microscopy identified (3.0%)(p < 0.05) with 100%
The global burden of human brucellosis remains enormous; it causes sensitivity and negative predictive value. qPCR was also able to detect
more than 500,000 infections per year. It is one of the most widespread polyparasitism by a factor of 7 compared to microscopy (p < 0.05). We
zoonotic diseases globally. Brucellosis is a multi-systemic, acute to chronic, have deployed a quantitative molecular based system that has improved
disease characterized by fever, headache, joint pains, musculo-skeletal diagnostic accuracy than stool microscopy. This is the first time this assay
pains, sweating, malaise and body wasting. It is a severe debilitating has been used in Argentina and has shown the prevalence of GI parasite
disease that requires prolonged treatment, if untreated can result in infections in symptomatic patients. The results will help refine treatment
permanent disability and loss of productivity. Human brucellosis presents options on a public health scale and lead to better health outcomes in
a great variety of clinical manifestations making it difficult to diagnose endemic settings.
clinically. In some endemic areas every case of human fever of unknown
origin is assumed to be due to brucellosis. Therefore, the diagnosis must
be confirmed by laboratory tests. A hospital-based survey on human
brucellosis was undertaken to determine its prevalence, associated factors
and the extent of missed diagnosis. A descriptive study and laboratory
analysis were conducted. A suspected case was defined as any patient >
5years with fever (>37.5oC) plus any two of the clinical signs suggestive of
human brucellosis. Socio-demographic features, clinical information and
assessment of potential risk factors were obtained through questionnaires.
696 ejection fraction, and cardiac index, and higher systemic vascular resistance
compared to cases with DF (p< 0.001 to < 0.05). Flow and tissue Doppler
UTILITY OF PROVISIONAL DIAGNOSES OF DENGUE FROM studies demonstrated a decreased early diastolic component of flow at
A SENTINEL-ENHANCED SURVEILLANCE SYSTEM IN PONCE, the mitral valves as well as decreased tissue plane excursion of the mitral
PUERTO RICO valves in DHF cases. These early differences were attributed to findings
from DHF cases with ultrasound-documented plasma leakage at this
David Noyd1, Tyler M. Sharp1, Leslie Camacho2, Olga Lorenzi1, time point. Serial studies showed that differences in hemodynamic and
Janice Perez-Padilla1, Aidsa Rivera1, Luisa Alvarado2, Kay M. cardiac functional indices between DF and DHF were most pronounced
Tomashek1 around the time of deferevescence. There were no clinically evident cases
Centers for Disease Control and Prevention, San Juan, PR, United States, of cardiac failure in this study. An abnormal ejection fraction (EF <55%)
San Lucas Episcopal Hospital, Ponce, PR, United States was observed in 6%, 9%, 18%, and 32% of cases of DF, DHF grade 1,
Dengue and a number of other acute febrile illnesses (AFI) present DHF grade 2, and DHF grades 3/4, respectively (p<0.001). However, the
with similar signs and symptoms. The unavailability of sensitive and abnormal EF was transient and usually coincided with the development of
specific rapid diagnostic tests poses a significant challenge to early and plasma leakage. No cases with abnormally elevated troponin-T levels were
accurate diagnosis of dengue because early identification is important identified. We conclude that cardiac involvement is uncommon in pediatric
for management of patients to reduce mortality. We used data from the dengue and is not a major contributing factor for dengue shock syndrome.
first year of a Sentinel Enhanced Dengue Surveillance System (SEDSS) in Subtle changes in cardiac function are common but appear to be transient
Ponce, Puerto Rico between May 7, 2012 and May 6, 2013 to evaluate and may reflect plasma leakage and volume status.
the accuracy of clinicians' diagnoses of patients presenting with an AFI (N
= 2,027) in a dengue-endemic area. A classification system was developed, 698
and diagnoses were grouped into syndromes defined as dengue,
influenza, viral infection, gastrointestinal, respiratory, genitourinary, and CHAGAS DISEASE TRANSMISSION AND CARDIAC
other. Laboratory diagnostic testing was performed for 23 pathogens MANIFESTATIONS AMONG TEXAS BLOOD DONORS
associated with AFI, including the four dengue viruses (DENV-1-4). Of Melissa N. Garcia, Kristy O. Murray, Laila Woc-Colburn, Maria
1,152 cases in which an infecting pathogen was identified, 579 (50.3%) Elena Botazzi, Rodion Gorchakov, Christie Ballantyne, Peter J.
were DENV-positive, 301 (26.1%) were positive for influenza, and 272 Hotez, David Aguilar
(23.6%) were positive for another pathogen. Among the DENV-positive
Baylor College of Medicine, Houston, TX, United States
cases, 243 (42%) received a provisional clinical diagnosis of dengue, while
183 (32%) and 60 (10%) were diagnosed as viral infection and respiratory Although well established as an important cause of morbidity and
illness, respectively. At initial clinical presentation, the DENV-positive cases mortality in Latin America, Chagas disease is increasing in recognition as
with a provisional diagnosis of dengue had a higher proportion with rash a potential cause of heart disease in the United States. Screening of blood
(53% vs. 0.38%; p = 0.001) and diarrhea (44% vs. 32%; p = 0.005), more donors in the greater Houston area for Chagas disease (Trypanosoma cruzi
pronounced leukopenia (3,100 vs. 4,600; p < 0.001), thrombocytopenia infection) began in 2007. The transmission mechanisms and potential
(93,203 vs. 155,937; p < 0.001), and elevated aspartate transaminase (175 cardiovascular manifestations of these T. cruzi positive individuals have
vs. 112; p = 0.001). Multiple logistic regression modeling and stratification not been previously studied. An one-time assessment of Houston area
analysis by age group will be performed to determine the clinical and blood donors that screened positive from 2008-2012 for T. cruzi infection
laboratory factors most associated with a clinical and laboratory diagnosis (n=30) included 1) blood draw for confirmatory T. cruzi diagnostic testing,
of dengue. This will both inform physicians in their diagnostic approach to 2) a questionnaire to evaluate source of infection, cardiac symptoms and
dengue and facilitate the use of provisional diagnoses as an early detection health co-morbidities, 3) high-sensitivity troponin T biomarker evaluation,
tool for increases in dengue in Puerto Rico. 4) an electrocardiogram, and 5) an echocardiogram if electrocardiogram
was abnormal. We found 57% (17/30) of blood donors had two or more
697 positive tests confirming infection. Of those with confirmed infection,
41% (7/17) had an electrocardiographic abnormality consistent with
CARDIAC INVOLVEMENT IN PEDIATRIC DENGUE; A SERIAL Chagas cardiomyopathy. In addition, 36% (6/17) were suspected to be
ECHOCARDIAGRAPHIC STUDY locally acquired cases. High-sensitivity troponin serum levels were increased
in a linear manner with cardiac severity. Cardiologists should consider the
Anon Srikiatkhachorn1, Tawatchai Kirawittaya2, In-Kyu Yoon3, changing transmission dynamics associated with Chagas disease in the
Sharone Green1, Francis A. Ennis1, Robert V. Gibbons4, Stephen J. southern United States and should consider Chagas disease in patients
Thomas5, Alan L. Rothman6, Siripen Kalayanarooj2 who may have clinically-compatible electrocardiogram or cardiomyopathy,
University of Massachusetts Medical School, Worcester, MA, United even if the patient has no history of residing in a Chagas-endemic country.
States, 2Queen Sirikit National Institute for Child Health, Bangkok,
Thailand, 3Armed Forces Research Institute of Medical Sciences-Virology, 699
Bangkok, Thailand, 4United States Army Institute of Surgical Research,
San Antonio, TX, United States, 5Walter Reed Army Institute of Research, EXAMINATION OF 2006-2013 MALARIA INCIDENCES IN
Silver Spring, MD, United States, 6University of Rhode Island, Providence, RELATION TO THE SCALING OF PREVENTATIVE CONTROL
RI, United States INTERVENTIONS IN MULEBA DISTRICT IN NORTHWEST
Dengue is the most prevalent vector-borne viral infection of humans. There TANZANIA
have been case reports of severe cardiac involvement including myocarditis
Shabbir Lalji1, Osiah Mwaipape1, Rose Lusinde1, Anold
in dengue, although the true incidence is not well defined. To better
Mutafungwa1, Rajeev Colaco1, Renata Mandike2, Jeremiah
characterize cardiac involvement we performed daily echocardiographic
studies in children with suspected dengue from 2010 to 2012 at a tertiary
care center in Bangkok, Thailand. Plasma levels of cardiac troponin-T RTI International, Dar-es-Salaam, United Republic of Tanzania, 2National
were measured daily. We analyzed 180 confirmed dengue cases classified Malaria Control Programme, Dar-es-Salaam, United Republic of Tanzania
as dengue fever (DF) and dengue hemorrhagic fever (DHF) according to Following outbreak of malaria in Muleba district in 2006, intensive malaria
the 1997 WHO case definitions. There were 119 cases of DF, and 12, control interventions, including Indoor Residual Spraying (IRS), and
27, 21, and 1 cases of DHF grade 1, 2, 3, and 4, respectively. On the distribution of LLINs were introduced. IRS was introduced as an outbreak
day of presentation (approximately 4.5 days of illness), DHF cases had preemptive measure in selected areas of the district in 2007 and 2008,
significantly lower stroke volume, left ventricular end-diastolic volume, with gradual scale-up of one round of IRS per year covering the entire
district until 2011. About 80,000 LLINs were distributed to under-fives (p<0.0001) with the FSAT approach successfully identifying 78.3% of
in 2009 and 170,000 nets distributed in early 2011 to the remaining parasite carriers. This strategy could provide a useful and operationally
population. However, due to universal attainment of LLINs in 2011, as attractive alternative to detecting subpatent infections in foci of infection.
well as limited resources, IRS was scaled down in 2012-2013, with the
last round targeting only 25% (17,000 house structures) of the district. 701
After 2011, no significant efforts have also been made to keep-up LLIN
coverage. We compared health facility based malaria incidence per 1000 SPATIAL PATTERNS OF MALARIA TRANSMISSION OVER
population of respective village catchment areas from Jan 2006-May ONE YEAR IN A CLINIC CATCHMENT AREA OF CHONGWE
2013, a period in which a total of 352,488 out-patient malaria cases DISTRICT, ZAMBIA
were recorded. District incidence in 2006 (pre-control period) was 118
per 1000, with the rate declining to its lowest level of 37 per 1000 in German Henostroza1, Jessie Pinchoff2, Jessie Pinchoff3, Sisa
2010. This peak decrease of 67% in malaria incidence at 2010 compared Hatwiinda4, Busiku Hamainza5, Hawela B. Moonga5, Frank C.
to 2006 was most likely due to intensification of effective multiple Curriero3
control interventions over that period. However from 2011 onward, scale
University of Alabama at Birmingham, Birmingham, AL, United States,
down and/or low maintenance of control interventions, coupled with
Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United
reported stock-outs of ACTs, and low net use (68%-THMIS 2011-12) States, 3Johns Hopkins Bloomberg School of Public Health, Baltimore, MD,
likely contributed to a rise in malaria incidence; by 2013, increasing to United States, 4Centre for Infectious Disease Research in Zambia, Lusaka,
181 per 1000 (adjusted for 12 month period). The 2013 rate was 35% Zambia, 5National Malaria Control Center, Lusaka, Zambia
higher than the pre control era of 2006. Muleba's case suggests that As malaria transmission declines, it may be more cost-effective and
scaling-down malaria control efforts has resulted in loss of initial gains efficient to focus control efforts on high-risk areas. Describing spatial
in controlling malaria. This could have serious implications with possible patterns of malaria transmission may identify opportunities to develop and
rebound of malaria to pre-intervention levels as well as frequent malaria improve current interventions. Individuals testing positive for malaria at a
outbreaks. Once the control of malaria has reached to manageable levels, single clinic in Chongwe District, Zambia, were approached for enrollment
it is important to advocate for effective monitoring and response so as to in the study. These index cases were administered a questionnaire and a
sustain the fight against malaria. blood sample was taken for a rapid diagnostic test (RDT) and microscopy.
Upon enrollment their homes were visited, all household contacts were
700 enrolled, administered a questionnaire, and gave a blood sample for RDT
and microscopy. GPS coordinates were recorded at each household. If
FOCAL SCREENING AND TREATMENT (FSAT) CAMPAIGN IN an individual from a previously enrolled household sought care, these
FOCI OF MALARIA TRANSMISSION: IMPACT ON MALARIA were considered re-infection households. Spatial patterns of malaria
PREVALENCE AND COMPLEXITY in this clinics catchment area were analyzed using SaTScan for cluster
detection and programs from R statistical software to describe patterns
Amrish Y. Baidjoe1, Gillian Stresman2, Jennifer Stevenson2, of spatial clustering. From June 2012 to June 2013 a total of 472 index
Wycliffe Odongo3, Chrispin Owaga3, Elizabeth Marube3, Victor cases and 1,901 household contacts (43% RDT positive) were enrolled.
Osoti3, Euniah Makori3, Shehu Shagari3, Lynn Grignard2, Chris Two statistically significant space-time clusters of index case households
Drakeley2, Jonathan Cox2, Teun Bousema1 were identified controlling for age and gender; one in December 2012
Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands, and one in January 2013 (the peak transmission season). No clustering of
London School of Hygiene & Tropical Medicine, London, United Kingdom, RDT positive household contacts was identified; factors associated with
Kenya Medical Research Institute, Centre for Global Health Research, being an RDT positive household contact included distance to the clinic,
Kisumu, Kenya socioeconomic status, and bednet ownership (p<0.05 for all comparisons).
Mass screening and treatment campaigns have had limited success In conclusion, transmission in this area appears to be high with a seasonal
in curbing malaria transmission, most likely due to the prevalence of peak in incidence during the rainy season. Two space-time clusters of index
subpatent infections missed using the field based diagnostic tools. It case households were detected during the peak transmission season in
has been shown that subpatent malaria infections are more likely to close proximity to the clinic. No clustering of malaria comparing household
occur in households where patent infections are identified. Therefore contacts was detected likely because of high transmission in the entire
it is possible that a more focal approach to treatment campaigns using catchment area.
patent infections as a marker for the presence of a subpatent reservoir
may be more effective at reducing the infectious reservoir in humans. To 702
test this strategy, a focal screening and treatment (FSAT) intervention in
foci of malaria transmission (prevalence 18,6%, 95% C.I. 10.8-26.5%) CESSATION OF COTRIMOXAZOLE PROPHYLAXIS IN HIV
was conducted in the western Kenyan highlands as part of a larger EXPOSED CHILDREN DOES NOT INCREASE THE INCIDENCE
cluster randomized trial. All consenting individuals under 15 years old OF MALARIA AND OTHER MORBIDITIES
or febrile adults residing within the foci were tested for malaria with a
rapid diagnostic test (RDT) and if found positive all individuals residing Nyanyiwe M. Mbeye1, Feiko O. ter Kuile2, Kamija Phiri1
in the compound received a curative dose of artemisinin combination
Malawi College of Medicine, Blantyre, Malawi, 2Liverpool School of
therapy. Blood spots on filter paper were collected from all household Tropical Medicine, Liverpool, United Kingdom
members (N=2083), regardless of RDT result. To assess the impact of HIV-exposed infants born to mothers with HIV should receive
FSAT, parasite prevalence and complexity using nested polymerase chain cotrimoxazole prophylaxis (CPT) until HIV infection can be excluded
reaction and merozoite surface protein-2 genotyping was determined. The and the child is no longer exposed through breastfeeding. As daily CPT
impact of the FSAT approach on parasite prevalence and allelic diversity provides prophylaxis against malaria, it could modulate the development
was assessed with two follow-up cross-sectional surveys at 2-month of malaria-specific immunity and increase the incidence of malaria after
intervals post intervention. Of the compounds within the intervention foci, it is stopped (a rebound effect). To determine if this is the case, we
168 of 406 (41.4%) households sampled received treatment. Twenty- investigated the incidence of malaria and other morbidities during and
seven households declined or had no individuals present during time after CPT in the first two years of life in HIV exposed children in southern
of sampling. Initial results indicate that, at baseline, PCR prevalence in Malawi. A cohort of 500 HIV exposed children on CPT for 12 months from
compounds with a patent infection and therefore targeted for treatment the age of 6 weeks to one year and 500 non-HIV exposed children not
was 34.0% compared to 11.1% in those that had no patent infections on CPT were followed until their second birthday. HIV exposed children
were recruited at the Prevention of Mother to Child Transmission (PMTCT)
HIV clinic while location and age-matched non-HIV exposed children were 704
recruited from the same population. The incidence of malaria, all-cause
morbidity, admissions and mortality was compared during the first and CHANGING HEALTH CONDITIONS AND THE DECLINE OF ALL-
second year of life in the two study groups using multivariate, negative CAUSE UNDER-FIVE MORTALITY IN RWANDA 2000-2010: A
binomial regression analyses. In year-1, the incidence of uncomplicated DECOMPOSITION ANALYSIS
malaria in HIV exposed children was 65% lower compared to the non-HIV
exposed group (IRR = 0.35, 95% CI 0.25, 0.49, p<0.001). In year-2 the Lia S. Florey1, Rebecca Winter1, Thomas Pullum1, Cameron
incidence of malaria in the HIV exposed group was similar to that in non- Taylor1, Corine Karema2, J. Eric Tongren3, Carrie Nielsen4, S. Rene
HIV exposed group (IRR 0.94, 95% CI: 0.53, 1.68, p=0.839) among the Salgado5
first 315 children that completed the follow-up period. The same pattern 1
ICF International - The DHS Program, Rockville, MD, United States,
was observed for all-cause morbidity and hospital admissions. CPT was 2
National Malaria Control Program, Kigali, Rwanda, 3Centers for Disease
associated with marked reductions in the incidence of uncomplicated Control and Prevention - President's Malaria Initiative, Kigali, Rwanda,
malaria, all-cause morbidity and hospital admissions during the period in 4
Centers for Disease Control and Prevention - President's Malaria Initiative,
which it was given. The follow-up in year-2 is on-going but preliminary Atlanta, GA, United States, 5United States Agency for International
results suggest that the incidence of malaria does not increase after Development - President's Malaria Initiative, Washington, DC, United
cessation of CPT at around 14 months of age. States
All-cause child mortality (ACCM) has declined rapidly over the past decade
703 in Rwanda, from 196 deaths per 1,000 live births during 1996-2000 to
76 deaths per 1,000 live births during 2006-2010. Rapid development
STANDARDIZED MULTIDISCIPLINARY METHOD FOR THE and improvements in many socioeconomic and health indicators between
EVALUATION OF THE EFFECTIVENESS OF MALARIA CONTROL 2000 and 2010 are likely to have played a role in determining these
INTERVENTIONS declines. For example, the percentage of households with improved toilets
increased from 9% to 72%, the percentage of households with mosquito
Thomas Kesteman1, Franck Remoue2, Milijaona
nets rose from 8% to 94%, and the percent of children whose mothers
Randrianarivelojosia1, Cédric Pennetier3, Martine Audibert4, Michel
used ITNs increased from 5% to 77%. In this analysis, decomposition
Etchepare5, Marc Egrot3, Christophe Rogier1, Palevalut Scientific
models were used to describe the decline in ACCM between two
Demographic and Health Surveys (DHS) (Rwanda DHS 2000 and Rwanda
Institut Pasteur de Madagascar, Antananarivo, Madagascar, 2Institut DHS 2010). The relative importance of changes in the distribution of key
de Recherche pour le Développement, Montpellier, France, 3Institut de socioeconomic and health-related variables (coverage) and changes in the
Recherche pour le Développement, Cotonou, Benin, 4Centre d'Etudes et magnitude of association between these variables and ACCM (coefficients)
de Recherches pour le Développement International, Clermont-Ferrand, across these surveys was examined. The model explains a decline of 83
France, 5Independent, Paris, France, 6Madagascar deaths per 1,000 live births from 2000 to 2010, or 69% of the reduction
In a global context of international funding plateauing, control programs observed from the surveys. Results show that the combined effect of all
are looking for innovative options to better perform with a constant of the changes in intervention coverage explained almost all (99%) of
budget. In absence of groundbreaking new control tools, the only option the modeled reduction in ACCM. Holding other factors constant, the
is to make the best use of the control measures that are already available. observed increase in household bednet ownership could have explained
In order to guide policy making, we propose to carry out a broad and as much as 45% of the modeled decline in ACCM between 2000 and
comprehensive evaluation of interventions deployed in a given setting, 2010, and 31% of the observed decline in ACCM from survey data.
including an evaluation of their effectiveness and the identification The increasing percentage of children whose mothers used ITN between
of the key determinants affecting their effectiveness. We wrote and 2000 and 2010 could have explained an additional 4.2% of the modeled
selected 20 Standard Operating Procedures (SOP) through a multi-country reduction in ACCM, presumably through reductions in neonatal mortality.
multidisciplinary workshop, including experts from Belgium, Benin, Improvements in coverage of antenatal care and increasing birth intervals
Cameroon, Côte d'Ivoire, France, Madagascar and Niger. These SOP cover could have explained an additional 13.4% and 3.1% of total modeled
the following fields: analysis of health systems (1), anthropology (1), ACCM decline, respectively. Changes in the distribution of household
biological diagnosis (4), drugs resistance (2), entomology (3), epidemiology wealth and of multiple births between surveys would have led to small
(4), health economics (2), and immunology (3). All 20 SOP are combined but significant increases in ACCM, holding other variables constant. These
in a single toolbox that is being implemented in Benin and Madagascar results clearly show the important role of malaria control interventions in
in 2014. Preliminary results will be presented. For each malaria control the reduction of child mortality in Rwanda.
intervention the following indicators are evaluated: coverage, protective
effectiveness against infection, protective effectiveness against morbidity, 705
cost-effectiveness, socio-anthropological determinants of effectiveness,
entomological determinants of effectiveness (vector behavior, insecticide VARIATIONS IN MALARIA EPIDEMIOLOGY IN RELATION
resistance) if applicable, and in vivo and in vitro measure of antimalarial TO VECTOR CONTROL COVERAGE IN NINE DISTRICTS OF
drug resistance. Results also include an analysis of health systems UGANDA
and management of malaria control in general. The toolbox -named
PALEVALUT- will be further reviewed before and after implementation in Tarekegn A. Abeku, Michelle Helinski, James Ssekitooleko,
Cameroon, Côte d'Ivoire and Niger in 2015. The whole tool will be soon Matthew J. Kirby, Irene Kyomuhangi, Godfrey Magumba, Sylvia R.
available with free access on the internet. Meek
Malaria Consortium, London, United Kingdom
Malaria has been a major public health problem in Uganda. The disease is
highly endemic in 95% of the country where 90% of the population live.
A scale up of malaria control interventions in the past decade coupled with
environmental, social and economic factors appears to have contributed
to a changing pattern of the epidemiology of the disease in the country.
This study was part of a larger study on the distribution of insecticide
resistance and resistance management. The aim of this component of
the study was to understand the impact of varying coverage of vector
control interventions on the observed epidemiological pattern of malaria
in different groups of districts. Three groups of nine districts were selected research suggests that CLTS has potential to be an effective approach for
among all highly endemic districts that were in existence since 2001, improving sanitation beliefs and behaviors in Zambia, which in turn may
using criteria based on coverage with long-lasting insecticidal nets (LLINs) result in improved child health.
and indoor residual spraying (IRS): 1) Districts that had undergone several
rounds of IRS (Apac, Gulu, Pader), 2) Districts where LLINs had been 707
distributed but no IRS had taken place (Kayunga, Kiboga, Mbale), and
3) Districts that had not received IRS or LLINs as part of large campaigns FACTORS ASSOCIATED WITH PUPIL LATRINE USE IN KENYAN
at the time of selection (Bugiri, Mayuge, Soroti). Forty-five cluster were PRIMARY SCHOOLS
sampled in the nine districts in which a cross-sectional survey was
conducted during September-October 2012 transmission season. A total
Joshua V. Garn, Carey D. Drews-Botsch, Matthew C. Freeman
of 528 interviews were conducted in the 45 clusters, an average of 12 Emory University, Atlanta, GA, United States
households per cluster. Blood samples were gathered from all household Little empirical data exist on how the type, design, and maintenance
members and mosquitoes were collected using the pyrethrum spray catch of school latrines affect pupil latrine use. The purpose of this study was
method. Anopheles gambiae s.l. and A. funestus s.l. were the main vectors to characterize how school sanitation conditions are associated with
collected. Prevalence of Plasmodium falciparum and density of malaria latrine use patterns in 60 primary schools in Nyanza Province, Kenya.
vectors varied between groups of districts with different levels of vector We conducted a longitudinal assessment, using structured observations
control coverage. The highest prevalence was observed in the unsprayed to measure both latrine conditions and latrine use during the 30 minute
group with historically low coverage with LLINs. Pyrethroid resistance was morning break. We modeled the association between pupil to latrine ratio
widespread in nearly all districts. The role of vector control interventions is and latrine use (pupil used a latrine vs. not), using multivariable logistic
discussed in the light of observed variations in malaria epidemiology. regression. Lower pupil to latrine ratios were associated with increased
latrine use, with the odds of use more than doubling when comparing
706 schools with the lowest pupil to latrine ratios (<15:1) to schools with
the highest ratios (>75:1; odds ratio=2.18, 95% CI: 1.69-2.80). We also
PERCEPTIONS OF COMMUNITY-LED TOTAL SANITATION ON modeled the association between different latrine characteristics and the
SANITATION BEHAVIORS IN RURAL ZAMBIA: A QUALITATIVE number of uses at specific facilities, using multivariable negative binomial
STUDY regression. Pupils preferred to use newer latrines over older latrines
(incidence rate ratio (IRR)=1.13, 95% CI: 1.01-1.26), and also preferred
J. Joseph Lawrence1, Kojo Yeboah-Antwi2, Godfrey Biemba3, ventilate improved pit latrines (IRR=1.15, 95% CI: 1.00-1.31) and
Pavani K. Ram4, Nicolas Osbert5, Davidson H. Hamer3 urinals (IRR=1.96, 95% CI: 1.57-2.44) over prefabricated plastic latrines
Zambia Center for Applied Health Research and Development, Lusaka, (IRR=0.68, 95% CI: 0.54-0.85) and traditional pit latrines (referent). An
Zambia, 2Center for Global Health and Development, Boston University increased number of latrines in a block (a group of conjoined latrines)
and Department of Global Health, Boston University School of Public was associated with increased use at that block, although the increase in
Health, Boston, MA, United States, 3Zambia Center for Applied use was not proportional to the block's added capacity (IRR for two doors
Health Research and Development and Center for Global Health and compared to one=1.13, 95% CI: 0.96-1.33; IRR for four doors=1.71,
Development, Boston University, Lusaka, Zambia, 4University at Buffalo, 95% CI: 1.39-2.10; IRR for six or more doors=2.26, 95% CI: 1.73-2.93).
Buffalo, NY, United States, 5UNICEF, Lusaka, Zambia We found some evidence suggesting latrine dirtiness was a deterrent to
Despite emerging initiatives in the sanitation sector, inadequate sanitation pupil latrine use, although the 95% CI included one (IRR=0.91, 95% CI:
remains a leading global contributor to morbidity and mortality in children. 0.82-1.02). Our study provides insights into factors affecting latrine use,
The government of Zambia, UNICEF, and partners are engaged in the potentially leading to a better allocation of resources for school sanitation,
rollout of an ambitious hygiene and sanitation program aimed at reaching with the end goal to improve pupil's health and educational outcomes.
3 million new users of improved sanitation hand washing practices. One
of the key approaches used to reach this objective is Community Led 708
Total Sanitation (CLTS), a grassroots, subsidy-free strategy with the goal
of changing sanitation practices to create open defecation free (ODF) THE IMPACT OF HOUSEHOLD IMPROVED SANITATION ON
villages. During CLTS, community members participate in activities that HUMAN FECAL EXPOSURE IN RURAL INDIA: APPLICATION OF
lead them to realize and declare that they are "eating each other's stool". MICROBIAL SOURCE TRACKING TECHNIQUES
This qualitative study explores community members' and stakeholders'
sanitation behaviors, knowledge and perceptions during early CLTS
Mitsunori Odagiri1, Alexander Schriewer1, Pravas R. Misra2, Pinaki
implementation in Zambia. We conducted 67 key informant interviews and
Panigrahi3, Stefan Weurtz1, Tom Clasen4, Marion W. Jenkins1
24 focus group discussions with community members and other WaSH
University of California Davis, Davis, CA, United States, 2Asian Institute
stakeholders in 6 districts in Zambia who were selected using purposive of Public Health, Bhubaneswar, India, 3University of Nebraska Medical
sampling based on recommendations from project staff. The study was Center, Omaha, NE, United States, 4London School of Hygiene & Tropical
conducted in July and December of 2013, 12 to 18 months after initiation Medicine, London, United Kingdom
of CLTS implementation. According to key informants, triggering activities In India, where 626 million mostly rural people practice open defecation
elicit a strong emotional response involving shame, disgust and peer and 535,000 children under age five die each year from diarrhea,
pressure which persuades individuals to build and use latrines. Pride and improved sanitation is clearly necessary to reduce fecal exposure. As
dignity were also reported as important influential factors, as individuals part of a large cluster randomized controlled sanitation trial in Odisha,
and communities become empowered. Traditional leaders and community India, to measure the impact of household latrines on diarrhea diseases,
Sanitation Action Groups have strong hierarchical influence that is also human fecal contamination and exposure in intervention and control
persuasive in changing behaviors. Respondents frequently mentioned that communities was measured and compared using microbial (fecal) source
children help to influence their families to improve sanitation behaviors. tracking (MST) methods based on host specific genetic markers of the gut
Overall, participants reported an increase in latrine construction and usage organism Bacteroidales. MST is an emerging approach to discriminate and
after triggering; however, poor (e.g. rocky or sandy) soil conditions and quantify human and other animal sources of fecal contamination. The
taboos prohibiting certain family members from sharing the same toilet goals of this study were (1) to measure levels of total, human and animal
act as barriers in many areas. CLTS results in powerful individual and fecal contamination in the public domain (improved and unimproved
community emotional responses that serve to encourage construction and water sources) and the domestic household domain (household stored
use of latrines and adoption of improved hygiene practices. This formative drinking water, mother and child hand rinses) of fecal-oral disease
transmission, and (2) to compare observed levels of total and human
fecal contamination in intervention and control villages for a better 710
understanding of pathways by which latrines reduce exposure in rural
India. In intervention (n = 30) and control (n = 30) villages, 20-L samples THE EFFECTIVENESS OF A RURAL SANITATION
were collected from improved (public deep and private shallow tube wells INTERVENTION ON HEALTH AND ORISSA, INDIA: A CLUSTER-
for drinking, n = 209) and unimproved (community ponds for bathing and RANDOMIZED, CONTROLLED TRIAL
hygiene activities, n = 94) water sources along with samples from 5 to 6
households per village, comprising 300-mL of household stored drinking Thomas Clasen1, Sophie Boisson1, Parimita Routray1, Belen
water (n = 348), and hand rinses of mothers (n =349) and children Torondel1, Marion Jenkins2, Matthew Freeman3
(n = 346), during the monsoon seasons of 2012 and 2013, after the 1
London School of Hygiene & Tropical Medicine, London, United Kingdom,
intervention had ended. After concentration by filtration, total-, human-, 2
University of California Davis, Davis, CA, United States, 3Rollins School of
and ruminant-associated markers were measured using quantitative PCR Public Health, Emory University, Atlanta, GA, United States
assays validated in India. Our results show that despite relatively high We undertook a cluster-randomized, controlled trial to assess the
detection rates of total Bacteroidales in the public domain (55 to 100%), effectiveness of a rural sanitation intervention under the Government
human-associated markers were rarely detected (1 to 5%). In contrast, of India's Total Sanitation Campaign (TSC) to prevent diarrhoea, child
detection rates of human-associated markers were significantly higher malnutrition and soil transmitted helminth infection. 100 rural villages
in the domestic domain (18 to 21%) while total Bacteroidales detection in Orissa, India were selected for participation in the study. We enrolled
rates were lower (53 to 70%). We present and discuss results of in-depth households with a child <4 years or a pregnant woman at the time of
analyses of observed levels of human fecal exposure, including effects enrolment. Following a baseline survey, 50 villages were randomized to
of household latrines on the different pathways tested in the public and the intervention arm and underwent latrine promotion and construction
domestic domains of disease transmission in study communities. in accordance with the TSC; control villages received no intervention.
Following the implementation period, we collected and assayed stool
709 samples for soil-transmitted helminths (STH) and provided deworming
tablets to assess the rate and intensity of reinfection; we also measured
IMPACT OF A COMMUNITY-LED TOTAL SANITATION the height of children <2 to assess HAZ. Thereafter, we visited study
INTERVENTION ON CHILD HEALTH IN RURAL MALI: participants 7 times over 18 months, collecting self-reported diarrhoea
EVIDENCE FROM A CLUSTER RANDOMIZED CONTROLLED prevalence for children <5 (primary outcome) and all members of the
TRIAL household as well as weights for children <5 to assess WAZ. At endline,
stools were again assessed for STH eggs and heights measured for children
Amy J. Pickering1, Maria Laura Alzua2, Habiba Djebbari3
<2. In sub-samples of households, we also assessed faecal contamination
Stanford University, Stanford, CA, United States, 2University of La Plata,
of household water supplies, hands of child caretakers and sentinel toys
Argentina, La Plata, Argentina, 3Aix-Marseille University, Marseille, France given to children and monitored the density of synanthropic flies that can
Globally 2.5 billion people lack access to an improved sanitation facility; serve as mechanical vectors of faeces. We assessed latrine coverage and
only 15% of rural households use improved sanitation in Mali (JMP 2014). use throughout the study villages with spot checks at mid-line and end-
Community-led total sanitation (CLTS) uses participatory approaches line of the surveillance period. The intervention increased mean village-
to mobilize communities to build their own toilets, facilitate sustained level latrine coverage from 9% to 63% in intervention villages compared
behavior change, and eliminate open defecation. Although CLTS has to an increase of 8% to 12% in control villages. 63% of households with
been implemented in over 50 countries, there is a lack of rigorous and any latrine reported using them. Health surveillance data was collected
objective data on its impacts on sanitation behaviors and child health. from 1437 households with children under 5 in the intervention arm
This cluster-randomized trial evaluated a CLTS program implemented by (1919 <5s, 10014 individuals overall), and 1465 (1916 <5s, 10269) in the
the government of Mali with support from UNICEF among 121 villages control arm. The intervention had no effect on diarrhoeal disease among
from the Koulikoro district of Mali. Household survey data (N=4299) children <5 (period prevalence ratio 0.97, 95%CI: 0.83-1.12) or all ages
collected 1.5 years post intervention delivery revealed that CLTS almost (1.02, 95%CI: 0.88-1.18). Neither did it impact HAZ for children under 2,
doubled access to private latrines (65% vs. 35%), as well as reduced WAZ for children <5, or the prevalence or egg count of STHs. There was
open defecation rates by over 70% among adults and by 50% among no evidence that the intervention impacted contamination of household
children (p<0.001). CLTS households were half as likely to have human drinking water, hands or sentinel toys, or impacted density of flies in food
feces observed in courtyards (p<0.001). Latrines in CLTS communities were preparation areas.
3 times more likely to have soap and have a cover over the pit, as well
as 20% less likely to have flies visible inside (p<0.001). Among children 711
under five, CLTS did not reduce the case definition of diarrhea (relative risk
[RR] 0.96, 95% CI 0.80-1.16), although risk of loose stool as measured CURRENT STRATEGIES AND CHALLENGES TO IMPLEMENTING
by an image chart was reduced by 24% for those children not exclusively HANDWASHING HARDWARE IN HUMANITARIAN
breastfeeding (RR 0.76, 95% CI 0.59-0.98). When accounting for baseline EMERGENCIES
height, children under five in CLTS villages were taller (+0.16 height-for-
age Z-score, 95% CI 0.0-0.32) and less likely to be stunted (RR 0.87, Jelena Vujcic1, Lauren S. Blum2, Pavani K. Ram1
95% CI 0.75-1.0). Improvements in child weight (+0.09 weight-for-age University at Buffalo, Buffalo, NY, United States, 2Independent Consultant,
Z-score, 95% CI -0.04 -0.21) and a reduction in the proportion of children Dakar, Senegal
underweight (RR 0.86, 95% CI 0.71-1.04) were observed but were not Diarrhea and respiratory infections are prevalent in humanitarian
statistically significant. This study provides evidence that a pure behavioral emergencies but can be prevented by handwashing with soap. The
intervention with no monetary subsidies substantially increased access to challenges to handwashing promotion in emergencies have not been
sanitation facilities in rural Mali. CLTS may have improved child growth systematically documented. Our objective was to examine current
through pathways other than preventing diarrhea, such as lessening the strategies and barriers to implementation of hardware to facilitate
subclinical condition of environmental enteropathy through potential handwashing among emergency-affected populations. We conducted key
reduced exposure to environmental fecal contamination. informant interviews with representatives at the global, regional or country
level of agencies supporting handwashing promotion in emergencies.
We identified key informants at an emergency environmental health
forum and used snowball sampling to identify additional respondents
with similar expertise. We coded themes based on key concepts and
used content analysis to identify data trends. Our 12 respondents were
staff of United Nations agencies, non-governmental and government 713
organizations. They reported that communal handwashing stations are
common in the acute phase of an emergency but maintenance of soap DETERMINANTS OF MORTALITY AMONG HUMAN
and water are problematic due to lack of ownership. Organizations IMMUNODEFICIENCY VIRUS AND TUBERCULOSIS (HIV/
aim to distribute soap according to SPHERE standards but SPHERE does TB) CO-INFECTED PATIENTS IN AMINU KANO TEACHING
not recommend quantities needed for handwashing. Consistency and HOSPITAL, KANO, NIGERIA
frequency of distribution of water dispensers and soap is highly variable in
the post-acute phase due to funding constraints, prioritization by response Mahmood M. Dalhat1, Sadiq S. Wali2, Musa B. Maiyaki2, Ahmad
agencies, and local market availability. There is a tradeoff between using M. Yakasai3, Musa M. Borodo2, Abdulhamid I. Dutse2, Abdulrazaq
local materials which are lower in cost and readily available and improved G. Habib1
materials that are typically costly but more desirable. Sanitizer was not 1
Infectious and Tropical Diseases Unit, Department of Medicine, Kano,
deemed a viable option for community-wide use due to acceptability, Nigeria, 2Department of Medicine, Bayero University, Kano, Nigeria,
cost and sustainability. Evaluations of hardware uptake and acceptability 3
Department of Medicine, Kano, Nigeria
are rare despite perceived utility of such data. Respondents indicated a Management of HIV and tuberculosis co-infection remains a major
strong interest in identifying hardware that is most acceptable among challenge for clinicians and public health authorities. We conducted
what is already available to emergency-affected populations. Assessing a prospective cohort study to determine risk factors of death among
the type of soap most attractive to populations and how hardware choices HIV/TB co-infected patients in Aminu Kano Teaching Hospital, Kano,
affect handwashing behavior could provide useful guidance to improve Nigeria. We recruited 160 consenting, newly diagnosed HIV/TB co-
handwashing promotion during emergencies. infected patients 18 year or older between June and December 2012.
We diagnosed TB by clinical features and any of positive sputum acid
712 fast bacilli (AFB), chest radiographic features of tuberculosis or biopsy
proven TB adenitis. We excluded patients with previous exposure to anti-
HANDWASHING BEHAVIOR CHANGE STRATEGIES TB or anti-retroviral drugs. We administered structured questionnaires to
IN HUMANITARIAN EMERGENCY SITUATIONS: THE collect socio-demographic, clinical and laboratory information. Patients
PERSPECTIVES OF EXPERTS started on highly active antiretroviral therapy (HAART) within 8 weeks
Lauren S. Blum, Jelena Vujcic, Pavani K. Ram of starting anti-TB were considered as commencing early treatment;
delayed commencement defined as starting HAART after 8 weeks of
University of Buffalo, Buffalo, NY, United States
starting anti-TB. Patients who reported ever missing a dose of either or
Handwashing can prevent diarrhea and acute respiratory infections, both of anti-TB and HAART drugs were considered as having sub-optimal
but is practiced infrequently in long-standing refugee camps. Little adherence. All patients were followed up for 6 months. We conducted
information is available on handwashing behavior change strategies bivariate and multivariate analyses to determine independent risk factors
targeting displaced persons during emergencies. We conducted key of death during the study. A total of 71 (44.4%) patients were females.
informant interviews between February and April 2013 with professionals The median (IQR) age was 33 (28 – 401) years). The mean (range) hospital
supporting water, sanitation and hygiene (WASH) services for emergency- stay for admitted patients was 20 (5 – 37) days. The mean CD4 counts
affected populations to understand behavior change strategies and to for patients who commenced early and those who delayed treatment
identify research gaps. We used purposive and snowball sampling to were 144 cells/mm3and 112 cells/mm3respectively. On bivariate analysis,
identify experts involved in handwashing promotion. Twelve respondents sputum AFB positivity HR (P-value): 3.1 (0.01); Hepatitis C co-infection
representing United Nations agencies, non-governmental organizations, HR (P-value): 9.8 (0.03) and sub-optimal adherence HR (P-value): 4.3
and a government agency were interviewed. Respondents reported that (0.001) to increase risk of dying among HIV/TB co-infected patients. In
technical and infrastructure aspects of WASH are not well coordinated contrast, early commencement of HAART HR (P-value): 0.2 (<0.001) was
with behavioral approaches; behavior change strategies are less of a found to decrease risk of dying. On multivariate analysis, risk of dying was
priority. Typically, implementing organizations set no specific goals related reduced by early commencement of HAART HR (P-value): 0.2 (0.005),
to improving handwashing practices. Respondents described a dearth while hepatitis C co-infection HR (P-value): 12.3 (0.03) and sub-optimal
of behavior change expertise at the global, regional and local levels. adherence HR (P-value): 2.8 (0.04) remained independent risk factors
Information on pre-existing knowledge and practices related to hand of death. Early commencement of HAART among HIV/TB co-infected
hygiene is generally not collected prior to implementation of handwashing patients improves survival. Clinicians should adhere to universally accepted
promotion. Messages focusing on health benefits are given over prolonged guidelines on timing of commencement of HAART. Sub-optimal adherence
timeframes, with little effort to understand motivators to handwashing should be addressed by strengthening adherence units in HIV programs.
or assess effectiveness and modify messages. A relatively unskilled
workforce is expected to deliver often complex, participatory methods 714
to improve behavior. Effectiveness of behavior change strategies is rarely
assessed. Our findings underscore the need to strengthen behavior change RECOVERY OF CD4+ T CELL COUNTS IN HIV-ASSOCIATED
expertise at all levels. The current reliance on anecdotal evidence hampers TUBERCULOSIS ACCORDING TO AGE, NUTRITIONAL STATUS
promotion of appropriate handwashing behavior. Lack of understanding AND ANTIRETROVIRAL THERAPY
of pre-existing behaviors and motivators for handwashing restricts
adaptations to the local context and likely undermines behavior change Amara E. Ezeamama1, Ezikiel Mupere2, James Oloya1, Robert
efforts. Establishing specific behavior change objectives and developing Kakaire1, Xiaoping Yin1, Juliet Sekandi1, Christopher C. Whalen1
contextually specific approaches could improve the effectiveness of The University of Georgia, Athens, GA, United States, 2Makerere
handwashing promotion in emergency settings. University School of Public Health, Kampala, Uganda
We quantified associations between age and the monthly change in
absolute CD4+ T cell count among HIV-infected tuberculosis (TB) patients
during six months of TB therapy with or without concurrent antiretroviral
therapy (ART). We determined whether this association is modified by
sex and baseline nutritional status. The parent study for this secondary
analysis was a randomized clinical trial of concurrent versus delayed ART
during TB treatment. The study population included 208 non-pregnant,
HIV-seropositive TB patients who had CD4+ T cell counts >350 cells/
µL and were naïve to anti-retroviral therapy. Age at enrollment was
defined in years within categories as ≤24, 25-29, 30-34, 35-39 and ≥40. 716
Nutritional status was classified as normal (BMI > 18.5 kg/m2) or low
(BMI ≤18.5 kg/m2). Multivariate random effects linear regression models HIV AND CHAGAS DISEASE: AN EVALUATION OF THE
were used to estimate mean differences in absolute CD4-cell count in CLINICAL PRESENTATION AND THE USE OF REAL-
relation to concurrent ART status and baseline age. Concurrent ART during TIME QUANTITATIVE PCR TO MEASURE LEVELS OF
TB therapy was associated with a monthly rise of 15.7 CD4+ T cells/ TRYPANOSOMA CRUZI PARASITEMIA IN HIV PATIENTS
µL (P<0.0001). There was no overall difference in CD4+ T cell response
by age during TB therapy (P=0.6550). However, among patients who Melissa Reimer-McAtee1, Carolina Mejia2, Caryn Bern3, Monica
received ART with TB treatment, greater gains in CD4+ T cell counts were Pajuelo4, Daniel Lozano Beltran2, Daniel Lozano Beltran2, Faustino
seen among younger patients (age*time*ART, p-value=0.0443), whereas Torrico2, Robert Gilman5
the same effect was not seen among patients who delayed ART. This 1
Tulane University, New Orleans, LA, United States, 2Universidad San
inverse association between age at ART initiation and CD4+ T cell increase Simon, Cochabamba, Plurinational State of Bolivia, 3University of San
during concurrent ART and TB therapy was strongest in females (p-value: Francisco California, San Francisco, CA, United States, 4Universidad
age*time=0.0059) and in patients with BMI ≥18.5kg/m2 at enrollment Peruana Cayetano Heredia, Lima, Peru, 5Johns Hopkins Bloomberg School
(p-value: age*time=0.0061). Our findings suggest that older HIV- of Public Health, Baltimore, MD, United States
seropositive patients on ART might experience a slower rate of immune With the persistence of Chagas disease in Latin America and with
restoration, especially if female or BMI ≥18.5kg/m2 at initiation. Older increased migration from rural to urban settings- where rates of HIV/AIDS
HIV-positive patients may benefit from closer monitoring of immune status are increasing- there has been an increase in the number of persons co-
and nutritional support during ART. infected with HIV and Chagas disease in recent years. This study evaluated
the clinical presentation and laboratory results of patients co-infected
715 with HIV and Chagas in Cochabamba, Bolivia, with a focus on the levels
of Trypanosoma cruzi parasitemia measured by real-time quantitative
FOOD INSECURITY, DIET DIVERSITY AND BMI OF HIV PCR (qRT-PCR) of blood clot. Clinical evaluation, electrocardiogram, chest
INFECTED INDIVIDUALS ON ANTIRETROVIRAL THERAPY IN radiograph, CD4 count, viral load, serology for T. Cruzi, direct microscopy
RURAL HAITI of blood, and real-time PCR of blood clot was performed on each
Gabriel W. Rebick1, Molly F. Franke2, Jessica E. Teng3, J. Gregory patient. Some patients also have a sample for qRT-PCR from whole blood
Jerome4, Louise C. Ivers3 with EDTA. 38 of the 133 HIV patients evaluated were co-infected with
Chagas disease (28.6%). Four of the 38 (10.3%) were positive by direct
Harvard School of Public Health, Boston, MA, United States, 2Department
microscopy, thus meeting the criteria for reactivation. Two of the patients
of Global Health and Social Medicine, Harvard Medical School, Boston,
with reactivation had very high levels of parasitemia (>1000 parasites/
MA, United States, 3Division of Global Health Equity, Brigham and
ml) by qRT-PCR of clot and by whole blood, however two patients with
Women's Hospital, Boston, MA, United States, 4Zanmi Lasante, St. Marc,
reactivation had no parasitemia detected by qRT-PCR of clot and only low
levels by whole blood (<40 parasites/ml). Our results demonstrated that
Food insecurity and malnutrition are both important risk factors high levels of parasitemia are associated with high HIV viral loads and
for poor outcomes in the treatment of people living with HIV. Food low CD4 counts; however, quantifiable levels of parasitemia did not show
supplementation is increasingly offered in conjunction with HIV programs. a strong correlation with symptoms of Chagas disease or reactivation.
Current programs focus on those with acute or chronic malnutrition. The Although the levels of T. cruzi parasitemia detected by qRT-PCR do not
optimal target population is unknown. We evaluated 490 HIV-infected show direct correlation with reactivation of Chagas disease or with clinical
individuals receiving antiretroviral therapy (ART) in rural Haiti. Baseline symptomatology in all patients, the level of parasitemia in HIV patients
data including body mass index (BMI), household food security (using may be an indication of those at risk for progression of disease. Further
the Household Hunger Scale), socioeconomic status (SES), medication studies are needed to determine the significance of parasitemia detected
adherence and dietary diversity were collected via structured interview. We by PCR, and whether asymptomatic patients with detectable T. cruzi
analyzed factors associated with low BMI and severe food insecurity using parasitemia should be treated with antiprotozoal agents.
logistic regression. Moderate to severe food insecurity was present in 89%
of individuals. Amongst severely food insecure subjects, 49% had a normal 717
or above normal BMI. After adjusting for age, sex, BMI and presence of
a garden in the home, severe food insecurity was associated with relative RISK OF ANTIRETROVIRAL TREATMENT FAILURE AMONG
poverty [odds ratio (OR) 2.37, 95% confidence interval (CI) 1.58 - 3.54, CLINICALLY STABLE ADULTS IN BLANTYRE, MALAWI
p<0.001], illiteracy (OR 1.79, 95% CI 1.19 - 2.71, p< 0.01), and having
no source of income generation (OR 1.63, 95% CI 1.04 - 2.56, p< 0.05). Randy G. Mungwira1, Matthew B. Laurens2, Titus H. Divala1,
Individuals with severe food insecurity had a less diverse diet, with less Osward M. Nyirenda1, Maxwell C. Kanjala1, Francis Muwalo1, Felix
frequent consumption of proteins. Food insecurity was highly prevalent A. Mkandawire1, Nettie Dzabala3, Terrie E. Taylor1, Jane Mallewa4,
in patients with HIV infection receiving ART. Normal or high BMI did not Joep V. Ousterhout5, Miriam K. Laufer6
rule out severe food insecurity. Current guidelines regarding the use food 1
Blantyre Malaria Project, Blantyre, Malawi, 2Howard Hughes Medical
support to supplement HIV treatment that are based on BMI will miss a Institute/Center for Vaccine Development, University of Maryland School
significant proportion of patients who may benefit from this intervention. of Medicine, Baltimore, MD, United States, 3College of Medicine, Blantyre,
Malawi, 4Department of Medicine, College of Medicine, Blantyre,
Malawi, 5Dignitas International, Zomba, Malawi, 6University of Maryland,
Baltimore, MD, United States
Millions of people living with HIV infection are receiving antiretroviral
therapy (ART) in sub-Saharan Africa without access to routine viral load
monitoring due to its expense and associated logistical challenges. If
those likely to have detectable HIV viral load could be identified by readily
identifiable risk factors, such patients could be prioritized for targeted viral
load monitoring. Targeted monitoring in patients who are clinically well
will allow for interventions before they develop severe illness or advanced
ART resistance and will likely be a more affordable and feasible strategy
than universal testing. As part of an on-going clinical trial at Ndirande
Health Centre in urban Blantyre, we conducted viral load and CD4 count 719
assessments for 945 healthy adult outpatients who had been on ART for
a minimum of six months. Ninety (10%) had HIV viral load >1000 copies/ COPING WITH CHRONIC DISEASE AND DISABILITY IN
mL and 64 (7%) >5000 copies/mL. Among patients with a detectable ISOLATED COMMUNITIES OF THE PERUVIAN AMAZON: A
viral load of greater than 40 copies/mL, the geometric mean was 3157 CASE SERIES
copies/mL (95% CI 2083 - 4786 copies/mL). The median CD4 cell count
was 454 cells/mm3 (95% CI 433 - 475), 147 (16%) had a CD4 cell count Jonathan Williamson1, Ronald Ramirez2, Tom Wingfield3
<250 cells/mm3. We will use logistic regression to investigate factors 1
Bristol Medical School, Bristol, United Kingdom, 2The Vine Trust and
associated with elevated viral load. The covariates in the modelling will Union Bíblica, Iquitos, Peru, 3Universidad Peruana Cayetano Heredia, Lima,
include age, sex, BMI, CD4 cell count, reason for ART initiation, current Peru and Imperial College London, United Kingdom, Lima, Peru
ART regimen, duration of ART and self-reported adherence. We will also Healthcare, physiotherapy and social services are limited in the Peruvian
explore the association between infections including TB and malaria and Amazon and visits from boat-clinics infrequent. Qualitative research in
viral load. Our goal is to identify patient characteristics that are associated Peruvian Amazonian communities concerning the impact of chronic
with increased risk of virological failure on ART that can be identified prior disease and disability on households is scarce. We aimed to explore real-
to overt ART clinical failure. Targeted viral load testing among high risk life situations faced by families in which a family member had chronic
individuals may be a cost-effective strategy to improve patient survival and disease or disability. Whilst conducting a descriptive pilot project of
limit the spread of ART resistance in resource-limited settings. patients accessing healthcare from a mobile boat-clinic serving 13 Peruvian
Amazon communities, we performed four qualitative, extended case
718 studies with consenting families. Interviews were performed in patient
households and explored disease and disability burden, healthcare
TRYPANOSOMA CRUZI PARASITEMIA IN access, social support, and use of traditional and modern medicine. All
IMMUNOSUPRESSED PATIENTS WITH HIV INFECTION OR interviews were reviewed with a translator and transcribed in Spanish and
ORGAN TRANSPLANT RECIPIENTS English. Case 1: Mrs B, a 52 year old school teacher, experiences chronic,
inflammatory small joint pains for which she takes ibuprofen and a self-
Maria A. Shikanai-Yasuda1, Noemia Barbosa Carvalho1,
prepared natural home remedy. Case 2: Mr C, a 49 year old subsistence
Christina Novaes Gallafrio2, Caroline Medeji1, Sheila Cristina Silva1,
farmer, has hypertension managed quarterly by a visiting medical boat
Rita Bezerra1, Federico Dulley3, Luiz Sérgio Azevedo4, Vicente
and lives with his bedbound 85 year old mother without social support.
Amato Neto1, Vera Lúcia Freitas5
Case 3: Mrs P, a 56 year old subsistence farmer, consulted the mobile
Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil, 2HIV medical boat-clinic due to problems with her 6 year old daughter's speech
Clinics, Divisão de Clínica de Moléstias Infecciosas e Parasitárias, São Paulo, and mobility due to which she has been denied local schooling. During
Brazil, 3Bone Marrow Transplant Unit, Hospital das Clínicas da Faculdade the consultation her daughter was diagnosed for the first time with
de Medicina da USP, São Paulo, Brazil, 4Kidney Transplant Unit, São Paulo, cerebral palsy. Case 4: Miss R, a 29 year old female, was diagnosed with
Brazil, 5Departamento de Doenças Infecciosas e Parasitárias, Faculdade de epilepsy when she was 13 years old and after initial local treatment with
Medicina, Universidade de São Paulo, São Paulo, Brazil traditional medicine has been intermittently treated by a distant clinic (3-4
Chagas disease is now an active and emergent disease in urban centers hours by boat) and visiting medical boats. Miss R was also more recently
of endemic and non endemic areas and affects around 7 million diagnosed with pseudoseizures. Her seizure activity remains uncontrolled.
inhabitants in Latin America and a contingent of infected immigrants in In conclusion, these cases exemplify the difficulties of coping with chronic
other continents. Considering the high morbimortality of chronic Chagas disease and disability in the Peruvian Amazon with constrained healthcare
disease reactivation associated with immunosupression, we analyzed infrastructure and minimal formal social support. The cases reveal ongoing
the levels of parasitemia in immunosupressed patients under solid and use of traditional medicine in addition to modern medicine potentially
stem cells transplantation (N=12) and in patients with HIV/Trypanosoma relating to local health beliefs and reduced access to modern healthcare.
cruzi co-infection (N= 43 patients). Blood samples from organ transplants Whilst mobile medical boats may be an adjunct to existing local healthcare
recipients were analyzed between the 4-6 months post transplant. A services, treating chronic diseases such as hypertension or epilepsy, is
control group of 91 patients with Chagas disease was also included. limited by infrequent and sporadic consultations.
Inclusion criteria for Chagas disease and HIV infection were the presence
of anti-Trypanosoma cruzi antibodies by ELISA or immunofluorescence and 720
presence of antibodies for HIV antigens by ELISA confirmed by imunoblot,
respectively. For diagnosis of Chagas disease reactivation, the parasite was DEVELOPMENT AND EVALUATION OF MULTIMEDIA
identified by direct microscopy on peripheral blood or other biological INFORMED CONSENT TOOL FOR A LOW LITERACY AFRICAN
fluid. Quantitative PCR was performed with genomic sequencies as RESEARCH POPULATION
previously described (Freitas et al, 2011). Higher parasitemia was observed
in the co-infected group in comparison to the control group with Chagas Muhammed O. Afolabi1, Kalifa A. Bojang1, Umberto
disease, and is related to the presence of reactivation of Chagas disease D'Alessandro1, Egeruan B. Imoukhuede2, Raffaella M. Ravinetto3,
in seven HIV infected patients in this group. Increased parasitemia was Heidi J. Larson4, Nuala McGrath5, Daniel Chandramohan4
detected in two of the seven kidney transplant patients: one patient with 1
Medical Research Council, Banjul, Gambia, 2University of Oxford, Oxford,
reactivation of Chagas disease, and one patient without reactivation United Kingdom, 3Institute of Tropical Medicine, Antwerp, Belgium,
but increased number of parasite DNA copies patient (higher than 200x 4
London School of Hygiene & Tropical Medicine, London, United Kingdom,
the pre transplant levels). Increased parasitemia is also observed in co- 5
University of Southampton, Southampton, United Kingdom
infected HIV/T. cruzi patients without reactivation in association with high International guidelines recommend the use of appropriate informed
parasitemia showed in xenodiagnosis test (higher than 20% of nymphs consent procedures in low literacy research settings because written
positive in each exam). Monitoring parasitemia by quantitative PCR should information is not known to guarantee comprehension of study
be considered as an useful tool for the management of chronic Chagas information. This study developed and evaluated a multimedia informed
diseases in patients under immunosupression. consent tool for people with low literacy in an area where a malaria
treatment trial was being planned in The Gambia. Methods: We developed
the informed consent document of the malaria treatment trial into a
multimedia tool integrating video, animations and audio narrations
in three major Gambian languages. Acceptability and ease of use of
the multimedia tool were assessed using quantitative and qualitative
methods. In two separate visits, the participants' comprehension of the 722
study information was measured by using a validated digitised audio
questionnaire. The majority of participants (70%) reported that the RELATIONSHIP OF ANGIOGENIC AND INFLAMMATORY
multimedia tool was clear and easy to understand. Participants had high BIOMARKERS AT MID-PREGNANCY TO SMALL-FOR-
scores on the domains of adverse events/risk, voluntary participation, study GESTATIONAL AGE OUTCOMES IN A PROSPECTIVE COHORT
procedures while lowest scores were recorded on the question items on OF TANZANIAN WOMEN
randomisation. The differences in mean scores for participants' 'recall' and
'understanding' between first and second visits were statistically significant Chloe E. McDonald1, Anne Marie Darling2, Andrea L. Conroy1,
(F (1, 41) = 25.38, p<0.00001 and (F (1, 41) = 31.61, p<0.00001 Kyla T. Hayford1, Molin Wang2, Said Aboud3, Willy S. Urassa3,
respectively. In conclusion, our locally developed multimedia tool was Wafaie W. Fawzi2, Kevin C. Kain1
acceptable and easy to administer among low literacy participants in University of Toronto, Toronto, ON, Canada, 2Harvard University, Boston,
The Gambia. It also proved to be effective in delivering and sustaining MA, United States, 3Muhimbili University of Health and Allied Sciences,
comprehension of study information across a diverse group of participants. Dar es Salaam, United Republic of Tanzania
Additional research is needed to compare the tool to the traditional Intrauterine growth restriction (IUGR) is a major public health problem
consent interview, both in The Gambia and in other sub-Saharan settings. that affects an estimated 27% of pregnancies in low and middle-income
countries. Inadequate fetal growth is associated with increased risk of
721 neonatal morbidity and mortality as well as developmental delay and
cardiometabolic disorders in adulthood. We examined the relationship
PANDEMIC INFLUENZA PREPAREDNESS IN CAMBODIA: AN between a panel of angiogenic and inflammatory biomarkers measured in
ECONOMIC EPIDEMIOLOGICAL DECISION ANALYSIS mid-pregnancy and small-for-gestational age (SGA) outcomes in Tanzanian
Tom Drake1, James Rudge2, Aronrag Meeyai2, Khieu Borin3, Sok women. Plasma samples were collected from a prospective cohort of 432
Touch4, Richard Coker2 primigravid women at enrolment (12-27 weeks gestation). Levels of 18
biomarkers (Ang-1, Ang-2, Ang-L3, VEGF, sFLT-1, sTNFR2, PIGF, MIP-1β,
University of Oxford, Oxford, United Kingdom, 2London School of
MCP-1, Leptin, IL-1β, IL-18 BP, sICAM-1, FAC-D, sEndoglin, CRP, CHI3L1,
Hygiene & Tropical Medicine, London, United Kingdom, 3Centre for
C5a) were analyzed by ELISA. Infants falling below the 10th percentile of
Livestock and Agriculture, Phnom Penh, Cambodia, 4Ministry of Health,
birth weight for gestational age relative to the applied growth standards
Phnom Penh, Cambodia
were considered SGA. Multivariate binomial regression models were
Pandemic burden is predicted to be high in low income countries, used to determine the relative risk of SGA associated with levels of each
relative wealthy well-resourced countries. Yet evaluations of cost effective biomarker. Receiver operating curves obtained from multivariate logistic
pandemic preparedness investments focus almost exclusively on high regression models were used to assess the discriminatory capability of
income countries. We undertake an economic evaluation of two pandemic selected biomarkers. A total of 60 participants (13.9%) gave birth to
preparedness investment options in Cambodia. We developed a dynamic SGA infants. Compared to those in the first quartile, the risk of SGA was
pandemic simulation model including age structure, health system capacity reduced among those in the fourth quartiles of VEGF-A (adjusted risk
and cost of illness. The model was used to perform cost utility analysis ratio (RR) 0.38, 95% Confidence Interval (CI), 0.19-0.74), PGF (adjusted
(CUA) on three pandemic preparedness investment options i) antiviral RR 0.28, 95% CI, 0.12-0.61), sFlt-1 (adjusted RR 0.48, 95% CI, 0.23-
stockpiling and ii) additional mechanical ventilators and iii) a 1:1 mixed 1.01), MCP-1 (adjusted RR 0.48, 95% CI, 0.25-0.92), and Leptin (adjusted
investment strategy. The analysis was repeated at three investment levels RR 0.46, 95% CI, 0.22-0.96). Our findings provide evidence of altered
US$250k, US$4 million and US$20 million. Due to the inherent uncertainty angiogenic and inflammatory mediators, at mid-pregnancy, in women who
in pandemic modelling we use sampling distributions in place of single went on to deliver small for gestational age infants. Studies are currently
point estimates for most parameter inputs. We also present a cost- under way to validate these findings in both internal and external cohorts.
consequence analysis (CCA) to place model results within the context of
non-quantified costs and consequences. At investment levels of US$250k
and US$4 million stockpiling is most cost effective, investment level of
US$20 million a mixed investment is preferable, reflective diminishing MULTINATIONAL DISEASE SURVEILLANCE PROGRAMS FOR
marginal returns from increased stockpile size. However there is CROSS-BORDER EPIDEMIOLOGIC INFORMATION EXCHANGE
substantially more uncertainty in incremental cost effectiveness ratio (ICER)
estimates for antiviral stockpiling. Also, the CCA highlights that investing Aiden K. Varan, Robson Bruniera-Oliveira, Christopher R. Peter,
in ventilators would have considerable utility between pandemics. It Maureen Fonseca-Ford, Stephen H. Waterman
is likely that both antiviral stockpiling and investment in mechanical Centers for Disease Control and Prevention, Division of Global Migration
ventilators are cost effective pandemic preparedness options. The caveats and Quarantine, San Diego, CA, United States
to this are the considerable uncertainty inherent in these estimates and Cross-border disease surveillance and response efforts in regions sharing
that depending on the payer, they may or may not be affordable or the borders depend on effective international collaboration. The Border
most urgent public health investment for Cambodia. Note: In light of the Infectious Disease Surveillance (BIDS) program facilitates epidemiologic
recent Cochrane publication on antiviral effectiveness (10th April 2014) we information exchange between the United States and Mexico. To
will be updating our analysis within the coming weeks. understand the global context for BIDS, we conducted a survey of
multinational disease surveillance programs (MNDSPs) operating
worldwide. Our survey assessed program organization, goals, operations,
decision-making processes, and evaluation. From January 2013 to March
2014, we identified MNDSP representatives through internet search and
querying domestic and international colleagues. We contacted 12 MNDSPs
and obtained responses from ten programs spanning all continents except
Antarctica. In general, responding programs aim to enhance epidemiologic
surveillance capabilities, strengthen cooperation for infectious disease
monitoring and prevention, and increase consistency among countries.
Reportable conditions are jointly selected by participating countries
based on common importance. Most programs have specific algorithms
for disease surveillance and laboratory testing. Eight (80%) of the ten
programs have a central database that obtains information through
manual data entry or electronic linkage. E-mail is the primary mode phases. "DENGUE-ALERT" is an innovative automated early warning
of communication. Eighty percent of the programs have multinational system for outbreak detection and response that provides a customizable
emergency notification contact lists. All ten programs meet at least "dashboard" with information from traditional epidemiological disease
annually in person or via video or teleconference. Fewer than half (40%) reports and entomological, climatic and crowd-sourced data. It targets a
of the programs share specimens or laboratory testing reagents among wide range of end-users including public health and community-based
countries. Local and national public health laboratories are the primary actors and is designed to enable earlier detection and reporting of virus
infrastructure for diagnostic testing. Seven of the ten programs have circulation or outbreak indicators to increase the efficiency of response and
dedicated funding allocated to MNDSP operation. Few programs have resource use. "DENGUE-SPECIALIST" is a web-based mobile application
implemented a routine quality assurance program. Despite variation designed to improve the efficiency and accuracy of clinical data access and
in health priorities, geography, and socioeconomic context, our survey analysis in hospitalized dengue cases. End-users are clinicians and nurses
identified key operational commonalities among MNDSPs and provides an in public sector hospitals. Simulations of SPECIALIST were tested with
important perspective on global disease surveillance efforts. data from multiple years of a clinical study in a Nicaraguan public hospital.
"DENGUE-LAB" is a web-based platform that supports a national-level
724 information management system for integrating laboratory results and
reporting to streamline information flow around the numerous tests used
KNOWLEDGE, ATTITUDES AND BEHAVIOR TOWARD for dengue diagnosis. LAB is designed to improve quality control measures,
PARASITE INFECTIONS AMONG HIGH SCHOOL STUDENTS IN simplify and automate some of the complexities of dengue diagnosis,
SOLOMON ISLANDS and impact both the quality and the reliability of diagnostic results. Both
quantitative and qualitative indicators were used in a mixed method
Tzu-Ping Weng1, Shih-Huai Hsiao1, Lin-Kun Wu2, Tenneth evaluation of the pilot of these tools to assess their ability to support
Dalipanda3, Wen-Ter Lai2 earlier and more accurate disease response and outbreak prevention.
Kaohsiung Medical University, Kaohsiung City, Taiwan, 2Kaohsiung Following this design and testing phase, the goal is to extend the use of
Medical University Hospital, Kaohsiung City, Taiwan, 3Ministry of Health these tools to Mexico and to other Central American countries that are
and Medical Service, Honiara, Solomon Islands interested and able to adapt and implement "customized" versions of
Pacific region is an epidemic area of different parasite infections. The ALERT, SPECIALIST and LAB as appropriate in their country contexts.
countries have provided examinations and medical supports to their
citizens. However, few statistic data and information on attitudes and 726
behavior toward parasite infections are available. The survey was trying
to investigate the knowledge, attitudes and behavior toward parasite DENGUE TORPEDO: A NOVEL APP TO MOTIVATE
infections among high school students in Solomon Islands. The survey was COMMUNITY-BASED DENGUE VECTOR CONTROL
conducted in August, 2012. Total of 679 participants, aged from 12 to 18
Josefina Coloma1, Rui Harayama2, Marco Herrera-Valdez3, Eva
years old, were randomly selected from St. Nicholas and St. Joseph high
Harris1, James Holston3
schools. Approximately 95% of participants indicated that they had clean
water for food preparation or cooking, however nearly 72% showed they
Division of Infectious Diseases and Vaccinology, School of Public Health,
didn't have drinking water boiled. 67% and 13% of the students said University of California Berkeley, Berkeley, CA, United States, 2LACS,
the main source of their drinking water was from rain and bottled water, Federal University of Minas Gerais, Minas Gerais, Brazil, 3Department of
respectively. 90% of the students had toilets at home, and 82% indicated Anthropology, University of California Berkeley, Berkeley, CA, United States
they had the habit of hand washing. However, up to 53% of participants Dengue is a mosquito-borne viral disease that continues to expand
didn't wear shoes, while 40% with excessively long fingernails. Nearly geographically in part due to failed efforts in vector control. Residents
28% of them had been diagnosed for parasite infections. 40% claimed of communities affected by dengue are potentially the best agents to
they had never learned about parasite prevention. A screening program control vector breeding sites, since the Aedes mosquitoes that transmit
executed by Taiwan Health Center in Solomon Islands showed the dengue virus breed in clean water in and around people's homes. We
prevalence of parasite infection among local students was up to 34%. present the design and piloting of Dengue Torpedo (DT), an interactive
The understanding of parasite prevention among high school students cellphone and web platform that combines mobile technology and
in Solomon Islands is still deficient, and it is not taught as part of the game concepts to motivate community residents to report and eliminate
curriculums in schools. Appropriate medical and educational resources mosquito breeding containers. DT (a) crowdsources the identification
need to be prompted to make significant changes in parasite prevention. and mapping of breeding sites (problem of information); (b) motivates
residents to act (problem of execution); (c) develops a collaborative model
725 of software production that involves local user-residents in researching,
testing, and designing the application; (d) promotes civic engagement
A LOW-COST ICT TOOL KIT FOR IMPROVED DENGUE and active citizenship; (e) involves residents in public health education;
SURVEILLANCE, LABORATORY MANAGEMENT AND CLINICAL and (f) engages youth in the creative development of communication
DECISION SUPPORT IN NICARAGUA technologies. Using a community-based collaborative model of software
design and development, we created alpha and beta versions of DT in Rio
Heather Zornetzer1, Josefina Coloma2, Eva Harris2, William de Janeiro, Brazil. The mobile and web interface is interactive and allows
Avilés1 residents to create their own profiles and exchange information about
Sustainable Sciences Institute, Managua, Nicaragua, 2Division of Infectious dengue in their neighborhoods. DT also has an educational component
Diseases and Vaccinology, School of Public Health, University of California that relates to other relevant issues in the community as well as specific
Berkeley, Berkeley, CA, United States information regarding dengue. Players earn badges and points that
Dengue is a mosquito-borne viral disease of major medical and public can be exchanged for community or personal prizes donated by local
health importance worldwide. We have developed and tested three sponsors and small businesses. DT has 5 participatory features in dengue
low-cost informatics tools in Nicaragua to help improve laboratory, vector control that make it pioneering: it is interactive, connects mobile
surveillance and clinical management practices to reduce dengue-related and web technologies, uses gameplay to motivate residents, institutes a
morbidity and mortality. As part of the Dengue FIRST initiative (Fighting community-based collaborative model of app development, and helps
Infections through Research, Science and Technology), these tools were local institutions sponsor related educational activities. In parallel, we are
developed collaboratively between the NGO the Sustainable Sciences developing DT for the Mexican health sector, incorporating contextually
Institute and the Ministry of Health of Nicaragua. Input from stakeholders appropriate information and designing the interface with input from
at the national, state and local levels was incorporated at multiple community members and researchers in Morelos, Mexico. DT can improve
public participation in combating dengue, generate new correlations and retained products after delivery), staffing, and availability of phone and
visualizations of scientific data of potentially great scale and low cost, ambulance for referring patients. EmOC quality categories included high (6
reduce mosquito infestation, and eventually decrease rates of dengue signal functions; ≥3 staff on call [24-hour coverage]; an ambulance and a
infection and disease. phone), moderate (≥4 signal functions; ≥2 staff [or no 24-hour coverage];
a phone), low (≥2 signal functions; ≥1 staff; a phone), and sub-standard
727 (no minimum criteria). Administrators of 432 hospitals were interviewed.
Administration of antibiotics was available in 99% of the hospitals,
OPENHDS: USE OF TABLET COMPUTERS IN HEALTH AND whereas anticonvulsant administration was only available in 65%. The
DEMOGRAPHIC SURVEILLANCE quality of EmOC was high in 31%, moderate in 55%, low in 4%, and
sub-standard in 9% of the hospitals; 32% did not have 24-hour coverage
Aurelio Di Pasquale1, Bruce MacLeod2, Tobias Homan3, Willem of skilled birth attendance. Approximately one-third of health facilities
Takken3, Richard Mukabana4, Thomas Smith1, Eveline Geubbels5, providing obstetric care in rural Bangladesh lack anticonvulsants needed to
Nicolas Maire1 manage eclampsia, an important cause of maternal mortality. Similarly, the
Swiss Tropical and Public Health Institute, Basel, Switzerland, 2USM, lack of 24-hour availability of skilled birth attendants increases the risk of
Portland, ME, United States, 3Wageningen University, Wageningen, peripartum complications. Given the high rate of maternal mortality, there
Netherlands, 4ICIPE, Mbita Point Township, Kenya, 5IHI, Dar es Salaam, is a pressing need to improve provision of EmOC in health facilities in rural
United Republic of Tanzania Bangladesh.
Health and Demographic surveillance systems (HDSS) can provide
essential information in areas where routine vital registration is absent or 729
incomplete. also play an essential role in health intervention studies in such
areas. Setting up and running an HDSS poses an operational challenge, OCCURRENCE OF SEVERE DENGUE FEVER IN AN ENDEMIC
and a reliable and efficient platform for data collection and management CITY OF BRAZIL: AN ECOLOGICAL STUDY
is a key prerequisite. OpenHDS is an HDSS data system that provides data
entry, quality control, and reporting to support demo-graphic and health
Gerusa Belo Gibson dos Santos, Alexandre San Pedro, Reinaldo
surveillance. It consists of two components: web and mobile. OpenHDS
Souza-Santos, Nildimar Honório, Marilia Sá Carvalho
mobile is integrated with the Open Data Kit (ODK) a software platform Oswaldo Cruz Foundation- FIOCRUZ, Rio de Janeiro, Brazil
for data collection using mobile devices running the Android operating Background: Brazil accounts for more than 70% of dengue cases notified
system, and allows direct data entry using tablet computers. This offers on the American continent. In this context, Rio de Janeiro became one of
a number of advantages over traditional paper-based systems: it reduces the most endemic cities in the country during the last decades, presenting
the workload of the data management team, no IDs need to be typed in a long history of co-circulation of all four dengue serotypes with a recent
(removing one of the biggest causes of errors on data collection in HDSS trend for the clinical and epidemiological profile of the disease to change.
systems); it allows for near real-time quality control; and it can provide Methods: This ecological study aimed to analyze the relationship between
guidance for the project logistics. The web interface allow viewing of the incidence of severe dengue during the 2008 epidemic in Rio de Janeiro
data collected and correction of errors/perform eventual amendments. City and socioeconomic, previous circulation of other dengue serotype
Here we present an overview of the openHDS/ODK software platform, and health service availability indicators. The data was incorporated
and report on the experience of using this platform to set up a HDSS in into a negative binomial regression model. Results: Districts with more
support of a trial of odour baited traps as a malaria intervention study on cases of dengue in the 2001 epidemic and where higher percentages of
Rusinga Island, Kenya, (Solarmal) Project. We also present the experience the residents who declare their skin color/race as black showed higher
of migrating the data systems of established HDSS sites from an older incidence rates of severe dengue in the 2008 epidemic. Meanwhile,
system (HRS) to openHDS (Ifakara and Rufiji, Tanzania). We show how districts with lower incidences of severe dengue in 2008 were those
OpenHDS addresses specific operational problems and the use of the with more Family Health Strategy (FHS) clinics. Conclusion: The findings
complete OpenHDS/ODK system for data collections offers a number of suggest persisting health inequities possibly due to greater socioeconomic
advantages over paper-based systems both with respect to data quality vulnerability among black population. Additionally, the protective effect of
and cost savings. FHS clinics may be due to facilitated access to other levels of health care or
even by reducing vulnerability to transmission afforded by local practices
728 in health promotion. These aspects reinforce the importance of better
understanding of social determinants in order to identify key-points for
AVAILABILITY OF SIGNAL FUNCTIONS AND QUALITY OF developing and implementing interventions for dengue control.
Wit Wichaidit , Mahbub Ul Alam , Amal K. Halder , Pavani K.
1 2 2
Ram1, Leanne Unicomb2, Davidson H. Hamer3 BRAZIL
University at Buffalo, Buffalo, NY, United States, 2International Centre for
Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh, 3Boston Rachel Lowe1, Christovam Barcellos2, Luis R. Lage Rodrigues1,
University, Boston, MA, United States Trevor Bailey3, Marilia Sá Carvalho2, Francisco Doblas-Reyes1,
Xavier Rodó1
The maternal mortality ratio in Bangladesh is high at 220 deaths per
100,000 live births. Emergency obstetrical care (EmOC) interventions
Institut Català de Ciències del Clima, Barcelona, Spain, 2Fundação
in health facilities are effective at reducing maternal mortality. Facility Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil, 3University of Exeter,
deliveries in Bangladesh have grown from 16% in 2000-2006 to 29% in Exeter, United Kingdom
2007-2012. This study assessed the quality of obstetrical services in health In this study, we address the potential to predict dengue fever epidemics
facilities serving rural areas of Bangladesh in order to identify opportunities across Brazil, during the peak dengue season (austral summer period).
to improve EmOC. We randomly sampled 50 rural villages in 46 of 64 We produce probabilistic dengue forecasts for the 553 microregions
districts of Bangladesh and interviewed the administrator of 8-9 hospitals of Brazil, from 2000 to 2014, using a novel spatio-temporal modelling
nearest to each sampled village. We categorized the quality of EmOC at framework. The dengue forecasts are driven by multi-model ensemble
each hospital according to its capacity to provide 6 basic EmOC signal seasonal climate forecasts and the observed epidemiological situation in
functions (administrations of antibiotics, oxytocin, and anticonvulsant; Brazil at the forecast issue date. The multi-model ensemble comprises
assisted vaginal delivery; manual removal of placenta and removal of several quasi-operational forecast systems, among them two systems
from the European EUROSIP initiative and six systems from the North 732
American Multi-Model Ensemble (NMME) project. This precursory
information allows dengue warnings to be released three months ahead. BREASTFEEDING PRACTICES AND CHILDHOOD DIARRHEA
We evaluate the past performance of the dengue early warning system MANAGEMENT AMONG WOMEN IN RURAL COMMUNITIES
by verifying probabilistic predictions against out-of-sample observed data. IN MOZAMBIQUE
Timely dengue early warnings provide the opportunity for the ministry
of health and local authorities to implement appropriate, city-specific Victor W. Galson, Natasha Anandaraja, Sigrid Hahn
mitigation and control actions. This model framework could be applied Icahn School of Medicine at Mount Sinai, New York, NY, United States
to predict outbreaks of other climate-sensitive diseases in other parts of Early childhood nutritional practices, including exclusive breastfeeding
the world. This is especially pertinent as climate change is likely to make for the first 6 months of life and adequate hydration of children with
diseases, such as dengue and malaria, more widespread. The successful diarrhea, are critical for minimizing morbidity and mortality from infectious
implementation of seasonal climate forecasts in disease early warning causes in the developing world. Gorongosa National Park in Mozambique
systems depends on close collaboration between public health specialists, is surrounded by rural communities with significant geographic and
climate scientists and mathematical modellers. The overall objective of this economic barriers to health resources. These communities are located
study is to bring awareness to scientists, policy makers and international in two groups: those located in the mountain region and those in the
health surveillance teams of the data and tools required in order to make plains region, with the mountain communities being especially isolated. In
timely predictions. We hope that this early warning framework will help 2011, a comprehensive household survey was conducted to study health
to improve prevention strategies for vector-borne diseases and establish a behaviors in these regions as part of an ongoing Ecohealth Program.
landmark towards the use of climate data to benefit society. 1625 women of reproductive age were surveyed by trained interviewers
in the local language: 1074 women from 4 mountain communities and
731 551 women from 2 plains communities. 192 women with children age 6
months or younger answered questions about breastfeeding, and 1035
COMMUNITY HEALTH WORKER TIME USE: METHOD women with children age 5 years or younger answered questions about
EVALUATION AND TIME USE FINDINGS IN MALAWI previous nutrition and diarrhea education, and diarrhea management.
Emily Carter1, Andrew Marsh1, Spy Munthali2, Gowokani Results showed that women in the plains communities were more likely to
Chirwa2, Neff Walker1, Ben Johns3, Agbessi Amouzou4 have received education about early childhood nutrition vs. women in the
mountain communities (85% vs. 28%, p<.0001), but in both populations,
Johns Hopkins School of Public Health, Baltimore, MD, United States,
there was no association between previous nutrition education and
University of Malawi, Zomba, Malawi, 3Abt Associates, Washington, DC,
exclusive breastfeeding (plains: RR .85, CI .31-2.28; mountain: RR 1.01,
United States, 4UNICEF, New York, NY, United States
CI .81-1.26). In the mountain communities, 46% of women withhold
Understanding community health worker (CHW) workload is critical for water completely during a child's episode of diarrhea; however, those who
maintaining program quality in the face of competing tasks. Time motion received previous education were significantly more likely to hydrate their
studies are considered the gold standard in time use research, but are child though the episode (RR 3.43, CI 2.19-5.38). No such association
prohibitively time and resource intensive. Four alternative measurement was found in the plains communities (RR 1.10, CI .92-1.32), where only
methods (3 interview methods and time diary) were piloted to assess time 7% of women will withhold hydration. These results can be used to tailor
use among CHWs as a subcomponent of a cost effectiveness evaluation a planned intervention involving a new nutrition educational program.
of the Rapid Scale-up of MNCH in Malawi in 2013. Based on pilot results, The data suggest that previous programs did not effectively teach best
2 interview methods (week-long vs. year-long reference period) were breastfeeding practices, and that there is an opportunity to increase
deployed to measure time use among 248 CHWs (126 implementing the number of women exclusively breastfeeding, especially in the plains
community cases management (CCM)) in 6 districts. Reported total communities where women are more likely to use breast milk alternatives.
hours and hours spent on CCM activities in an average week were The data also suggest that prior education about rehydration in diarrhea
higher and more variable using the year-long vs. week-long interview has been successful in the mountain communities, and any future nutrition
method. Correlation between methods in estimated work hours/week programs should model educational materials accordingly.
(0.12) and CCM hours/week (0.27) was very low. Based on implausible
variability in time use estimated by the year-long method, final results 733
were reported using the week-long method only. On average a CHW
reported working 42.29 (95% CI: 38.88, 45.70) hours/week and those ACCEPTABILITY AND EFFECTIVE USE OF A RAPID HOME
who implemented CCM spent 18.08 (95% CI: 16.24, 19.92) hours/ DIAGNOSTIC TEST FOR MULTIPLE INFECTIOUS DISEASES:
week on CCM. CCM (Adjusted coeff: 10.32; 95% CI: 5.09, 15.56) and FORMATIVE RESEARCH IN PERU AND CAMBODIA
each additional intervention implemented (Adjusted coeff: 1.86; 95%
CI: 0.81, 2.90) increased total number of hours worked per week. CHWs Valerie A. Paz Soldan1, Pamina M. Gorbach2, Amy C. Morrison3,
who implemented CCM spent significantly less time on nutrition (Coeff: Sopheab Heng4, Jennie L. Mckenney5, Chhea Chhorvann4,
-2.24; 95% CI: -3.12, -1.37), HIV (Coeff: -3.49; 95% CI: -6.56, -0.42), Vonthanak Saphonn6, Robert D. Hontz7, Christopher A. Myers8,
and community based maternal and newborn health interventions (Coeff: Eric S. Halsey7, Shawn P. Mulvaney9, Patrick J. Blair10, Erin
-1.31; 95% CI: -2.33, -0.30), compared with CHWs implementing those McDonough8, Shevin T. Jacob11
services but not CCM. Findings highlight the importance of an accurate 1
Tulane University School of Public Health and Tropical Medicine, New
and efficient means of assessing CHW time use to determine feasibility Orleans, LA, United States, 2University of California Los Angeles, CA,
and impact of introducing additional tasks. Time use interviews offer United States, 3University of California Davis, CA, United States, 4National
promise for collecting time use data when a large number of CHWs Institute of Public Health, Phnom Penh, Cambodia, 5University of
are targeted, although further refinement and validation against a gold California, Los Angeles, Fielding School of Public Health, Los Angeles, CA,
standard time assessment is needed. United States, 6University of Health Sciences, Phnom Penh, Cambodia,
U.S. Naval Medical Research Unit - 6, Lima, Peru, 8Naval Health Research
Center, San Diego, CA, United States, 9Naval Research Laboratory,
Washington, DC, United States, 10Naval Medical Research Center-Asia,
Singapore, Singapore, 11University of Washington, Seattle, WA, United
In 2012, the U.S. Defense Threat Reduction Agency Joint Science and
Technology Office initiated a program to develop novel point-of-need
diagnostics for surveillance of emerging infectious diseases including physiotherapy. Focus should be on continuous professional development
dengue, malaria, plague, and melioidosis. Prior to distribution of devices to improve knowledge. Education and training curriculum should be
to community members in Iquitos, Peru, and Phnom Penh, Cambodia, reviewed.
research was conducted to assess acceptability of use, determine
conditions in which use would occur, examine incentives to use the device 735
on someone with fever >5 years of age in their home, and assess device
use competency. In February 2014, 9 focus group discussions (FGD) with TREATMENT OF POSTPARTUM HEMORRHAGE WITH
community members and 5 FGD with health professionals were conducted MISOPROSTOL BY GUATEMALAN TRADITIONAL MIDWIVES
in Iquitos, and 9 FGD with community members and 9 in-depth interviews
with health professionals in Phnom Penh. In both places, participants
Nora E. King1, Peter Rohloff2
agreed to use the device themselves (involving finger prick) or could Mayo Clinic, Rochester, MN, United States, 2Brigham and Women's
identify someone to do so. The main incentive identified in Iquitos was the Hospital, Boston, MA, United States
ability for tentative results to be used for care facilitation (as devices would Postpartum hemorrhage (PPH) due to uterine atony is a leading cause of
not provide usable results for individuals), specifically reduced wait times maternal mortality in Guatemala, especially in rural areas where homebirth
to be seen or obtain a diagnosis. In Phnom Penh, the main incentives were is common. In a pilot project, 36 Guatemalan traditional midwives received
monetary compensation (~US$2.50/test) or results from a simultaneous training on the recognition and treatment of PPH using 800 μg buccal
rapid test; also, free medicine for the sick was acceptable in lieu of usable misoprostol. Training was designed to be linguistically and culturally
results. To assess device use competency in Iquitos, participants were asked appropriate. Pre- and post-evaluation showed participants' knowledge
to read instructions and apply the device to research team members. Most of PPH signs, prevention and treatment using misoprostol significantly
steps were done correctly; the most difficult was proper recording of test increased following training. Ongoing data collection, to be completed
results. In Phnom Penh, participants were asked to describe each step after in June 2014, demonstrates that midwives are capable of recognizing
reviewing the instructions; however, they struggled with comprehension. PPH and using misoprostol for its treatment. We plan to expand our
Health professionals' main concerns were their community's ability to work to reach more midwives, further addressing the shortage of data on
accurately use the test, complicated instructions, and safety. Motivation misoprostol for PPH treatment in homebirth, particularly in Latin America.
and ability to use home diagnostic devices depended on local attitudes
that varied between the two disease endemic sites, illustrating the value of 736
formative research before deployment of novel technologies.
ABOUT INTEGRATION OF HEALTH PROMOTION IN Peng Jia1, Osman Sankoh2, Andrew J. Tatem3
Louisiana State University, Baton Rouge, LA, United States, 2University
of the Witwatersrand, Johannesburg, South Africa, 3University of
Nomathemba P. Taukobong1, Helen Myezwa2, Jessica Freyman3, Southampton, Southampton, United Kingdom
Jessica Freyman3, Jessica Freyman3, Jean-Pierre J. Van Geertruyden3 The International Network for the Demographic Evaluation of Populations
University of Limpopo-Medunsa Campus, Pretoria, South Africa, and their Health (INDEPTH) was initiated in1998 and has produced reliable
University of Witwatersrand, Johannesburg, South Africa, 3University of longitudinal data about the lives of people in low- and middle-income
Antwerp, Wilrjik, Belgium countries (LMICs) and the impact on those lives of development policies
This study was undertaken to determine the status of integration of health and programs through a global network of health and demographic
promotion in physiotherapy practice from both physiotherapists and surveillance system (HDSS) sites. Since stable and reliable health and
patients' perspectives. A qualitative research method was followed. A rich demographic data are scarce across many LMICs, here we examine the
purposive sample of physiotherapists patients from different health care environmental and socioeconomic similarities between existing HDSS field
settings provided information for data collection during semi-structure sites and the rest of the LMICs in Africa and Asia, so as to provide evidence
interviews which lasted from 45 to 60 minutes. Data were collected in terms of levels of confidence in extrapolating the findings from HDSS
over a period of six months. All interviews were audio taped followed field sites to other regions. A 'signature', consisting of 15 environmental
by verbatim transcription. The Nvivo version 10 program was used. and socioeconomic variables, was constructed for each HDSS field site.
The following sequence was followed in data analysis: Familiarisation The field sites were then hierarchically grouped by the similarity of their
with data, code book construction, thematic analysis, synthesis and signatures to quantify the variability in terms of environmental and
identification of similarities, identification of overarching themes and socioeconomic conditions between sites, and these similarities were
formulation of concept. A total of 35 physiotherapists, 69% females mapped. The current INDEPTH HDSS field site network covering Africa and
and 31% males, as well as 21 patients, 55% females and 45% males, Asia spans a wide range of climatic and environmental conditions. The
participated in the interviews. All physiotherapists had a work experience similarity maps produced provide valuable information in determining the
of more than 5 years whilst patients' age ranged between 24 years to confidence with which relationships derived from present HDSS field sites
60 years. Physiotherapists' workload comprised of in- and out-patients can be extended to other areas, and to highlight areas where the location
whilst patients attended physiotherapy sessions at hospital and Primary of new HDSS field sites would improve significantly the environmental and
Health Care (PHC) settings. Concepts formulated for both groups were socioeconomic coverage of the network. The results also indicate suites of
knowledge, attitude and practice. Patients do have an understanding of field sites that form cohesive groups and from which data can be logically
what health promotion means and expect health promotion service during summarized.
physiotherapy treatment as well as aspire to be self-efficient in looking
after their health. The physiotherapists are unable to differentiate between
health education and health promotion though they have a positive
attitude towards health promotion in practice. They rarely integrate health
promotion in their daily practice. In conclusion, the need to integrate
health promotion in practice exists. Hospital and PHC based physiotherapy
differ. There are gaps between the patients' needs and physiotherapy
practice requiring policy and guidelines to drive health promotion in
737 febrile and vector-borne illness (FVBI) surveillance program is to integrate
febrile illness, arthropod-vector, and pathogen discovery surveillance
EVALUATION OF POINT-OF-CARE AND POINT-OF-NEED systems that contribute to Force Health Protection and global public health
MULTIPLEX DIAGNOSTIC DEVICES FOR EASE OF USE through: 1) characterizing the geographic distribution, transmission,
AND FOR TRANSMITTING RESULTS THROUGH A SECURE and risk of FVBI pathogens and related illnesses; 2) outbreak detection
ENCRYPTED REMOTE NETWORK and response; 3) generation of actionable surveillance data supporting
informed patient care and FVBI disease risk assessments; 4) promoting
Robert D. Hontz1, David A. Stenger2, Shawn P. Mulvaney2, FVBI-related research, training, and capacity-building initiatives. During
Amy C. Morrison3, Valerie A. Paz-Soldan4, Pamina M. Gorbach5, fiscal year 2014, the FVBI program funded 36 competitive proposals
Christopher A. Myers6, Erin A. McDonough6, Kathlyn Santos7, supporting surveillance efforts in 32 countries. Recent program
Andrea J. McCoy8, Guillermo Pimentel8, Eric S. Halsey9, Patrick J. accomplishments include extensive global surveillance for drug-resistant
Blair10, Shevin T. Jacob11 malaria with initiation of a multi-site clinical trial evaluating Plasmodium
U.S. Naval Medical Research Unit - 6, Lima, Peru, 2Naval Research falciparum artemisinin resistance in Thailand, Kenya, and Peru. Flea,
Laboratory, Washington, DC, United States, 3U.S. Naval Medical Research chigger, and animal reservoir collections data (>90,000 data points) were
Unit - 6, Iquitos, Peru, 4Tulane University, New Orleans, LA, United States, also incorporated into the GEIS-funded VectorMap program, a publicly
University of California Los Angeles, Los Angeles, CA, United States, available repository for global arthropod vector collection data (www.
Naval Health Research Center, San Diego, CA, United States, 7Johns vectormap.org). AFHSC-GEIS coordinates a worldwide surveillance
Hopkins University, Laurel, MD, United States, 8Naval Medical Research network comprised of military and civilian laboratory partners who
Center, Frederick, MD, United States, 9Centers for Disease Control and conduct FVBI surveillance in US military as well as foreign military and
Prevention, Atlanta, GA, United States, 10Naval Medical Research Center civilian populations. GEIS-funded initiatives yield enhanced recognition
- Asia, Singapore, Singapore, 11University of Washington, Seattle, WA, of the risks and threats from FVBI supporting the public health needs
United States of military and associated populations in a growing number of partner
The United States Department of Defense's (DoD) Defense Threat nations.
Reduction Agency recently initiated a program designed to drive
development of novel point-of-need (PON) diagnostic devices within a 739
biosurveillance network for capturing emerging infectious diseases in
austere locations. DoD biomedical laboratories are evaluating two devices
in South America (Peru), Australia, Southeast Asia (Thailand, Cambodia), MEASLES OUTBREAKS IN THE PHILIPPINES
and Africa (Sierra Leone) to mimic real-world settings similar to those Eugene Lam1, Maricel de Quiroz-Castro2, Maria Joyce U.
encountered by deployed military personnel. These multiplex devices are Ducusin3, Dulce Cecilio-Elfa4, W. William Schluter5, Sigrun Roesel2
designed to detect pathogens that cause dengue fever, malaria, plague, 1
Centers for Disease Control and Prevention, Center for Global Health,
and melioidosis: a clinic/medic-based point-of-care (POC) molecular
Global Immunization Division, Atlanta, GA, United States, 2World Health
diagnostic device for use in health care clinics and hospitals with health-
Organization, Office of the World Health Organization Representative
care providers as the end-user, and a patient-administered "buddy-test"
in the Philippines, Manila, Philippines, 3National Center for Disease
PON device to be used in community households with the lay person as
Prevention and Control, Department of Health, Manila, Philippines,
the end-user. For POC testing, 11 Investigational Use Only (IUO)-labeled 4
National Epidemiology Center, Department of Health, Manila, Philippines,
systems and 1000-2000 test pouches will be distributed to each site. 5
World Health Organization, Western Pacific Regional Office, Manila,
Nearly 1400 POC subjects will be enrolled in Peru with an expected
dengue disease rate of 20-25%, and 2500 subjects will be enrolled
in SE Asia with an expected melioidosis disease rate of 10%. For PON Measles is a highly contagious viral disease and remains an important
testing, 7000 to 9000 Research-Use Only (RUO)-labeled devices will be cause of death and disability among children globally. In 2012, the World
distributed across all locations to detect dengue (Peru), malaria, plague, Health Organization (WHO) Regional Committee for the Western Pacific
and melioidosis (all other locations). De-identified and blinded results from Region (WPR) reaffirmed its commitment to eliminate measles and urged
these PON and POC tests will be compared to gold standard testing for member states to interrupt endemic measles virus transmission as rapidly
study of device sensitivity and specificity (aiming for 85% for Role 1; 75% as possible. Despite the Philippines' continued commitment to this goal
for Role 0), then wirelessly communicated through a secure encrypted and a nationwide supplemental immunization activity conducted with
remote network (SERN) using an FIO reader (success considered at 90% measles and rubella vaccine targeting children aged 9 months to <8
accuracy). Successful demonstration of delivery of de-identified and years in 2011, a total of 1499 cases of measles were reported in 2012.
encoded test results through the SERN will enable forward operators direct Identifying areas at risk of outbreaks can provide an effective strategy in
access to surveillance and reach-back analysis remotely in locations devoid targeting immunization efforts and preventing future outbreaks. Based
of established medical treatment facilities, and will provide information on a polio risk assessment tool developed in WPRO and applied in the
about infectious disease threats. Philippines, an assessment tool was developed to assess risk of measles
outbreaks. Overall risk of an outbreak was assessed as a function of
indicator scores that fall into four main categories of risk components
738 (with corresponding weights): population immunity (50%), surveillance
quality (24%), program delivery performance (6%), and threat probability
U.S. DEPARTMENT OF DEFENSE GLOBAL FEBRILE AND assessment (20%). Cut-off criteria for each indicator score were created to
VECTOR-BORNE ILLNESS SURVEILLANCE PROGRAM assign an overall risk category score (RCS). The RCS was categorized into
Jeffrey McCollum, Alaina C. Thomas, Clara G. Marshall, James F. very high, high, medium, or low risk using available data at the second
Cummings subnational administrative level. Preliminary results of the risk assessment
compared with reported measles cases in 2013 showed clusters of
Armed Forces Health Surveillance Center, Silver Spring, MD, United States
laboratory-confirmed measles cases in areas identified as high and very
Originally established by Presidential Directive in 1997, the Department high risk. Risk assessments can be used for advocacy to communicate risk
of Defense (DoD) Global Emerging Infections Surveillance and Responsive to policymakers, mobilize resources, and strategically guide immunization
System (GEIS) was expanded in 2006 and subsequently incorporated as response accordingly to the level of risk. Ongoing evaluation of indicators
a Division of the Armed Forces Health Surveillance Center (AFHSC) in is needed to effectively plan risk mitigation activities and to evaluate
2008. AFHSC-GEIS divides its surveillance approach into five infectious performance towards elimination of measles. Further studies are needed
disease categories: respiratory, gastrointestinal, febrile and vector-borne, to pilot test the risk assessment tool in other countries and regions.
antimicrobial resistant, and sexually transmitted. The goal of the GEIS
740 literature identifying preterm birth and small-for-gestational age (SGA) as
predictors of childhood stunting. These results emphasize the need for
RISK FACTORS AND PREDICTORS OF PRETERM BIRTH IN DAR targeted interventions to foster optimal in-utero growth and prevent small-
ES SALAAM, TANZANIA for-gestational age and preterm births, which would lead to lower rates of
stunting in Bolivia.
Grace J. Chan1, Ayesha Sania1, Gernard I. Msamanga2, Willy
Urassa2, Ellen Hertzmark1, Donna Spiegelman1, Wafaie W. Fawzi1
Harvard School of Public Health, Boston, MA, United States, 2Muhimbili
University College of Health Sciences, Dar es Salaam, United Republic of THE PUBLIC HEALTH IMPACT AND COST-EFFECTIVENESS
Tanzania OF DIAGNOSTIC AND PROGNOSTIC TOOLS FOR CASE
Preterm birth is associated with early life mortality and morbidity. In MANAGEMENT OF NON-MALARIAL FEBRILE ILLNESS IN
Tanzania, 1900000 babies are born each year of which 11.45% are CHILDREN UNDER FIVE
preterm (less than 37 weeks gestation). Complications of preterm birth
account for 40% of neonatal mortality and survivors are at high risk
Lindsey Wu, Azra C. Ghani
for long-term neurodevelopmental and behavioral sequelae. We aim MRC Centre for Outbreak Analysis and Modelling, Department of
to identify the incidence, risk factors, and predictors for preterm birth Infectious Disease Epidemiology, Imperial College London, London, United
in Dar es Salaam, Tanzania. We prospectively followed 8428 mother- Kingdom
newborn pairs enrolled from 2001-2004. Maternal and socioeconomic As malaria transmission declines globally, there is increasing recognition
characteristics, obstetric history, and medical illnesses were collected of the importance of correct identification and treatment of non-malarial
during pregnancy. Birth outcomes included small for gestational age (SGA, febrile illness (NMFI). Studies have shown that in many regions, a decrease
weight below the 10th percentile for gestational age) and preterm birth in antimalarial therapy has been accompanied by a simultaneous increase
(less than 37 weeks gestation). We conducted bivariate and multivariate in antibiotic use. In the absence of appropriate diagnostic and prognostic
analyses using log-binomial regression models to examine the effect of tools, currently recommended guidelines for integrated management of
predictor variables on outcomes. Of the 8428 pregnant women, 8003 childhood illness (IMCI) can potentially lead to overuse of antimalarials and
(95.0%) gave birth to live newborns and were eligible for analysis. antibiotics as well as under-referral of patients with early signs of severe
The incidence of preterm birth was 16.7%. Risk of preterm birth was illness requiring hospital treatment. We developed a Markov chain model
associated with older maternal age greater than 34 years of age (RR=1.14 to assess a range of diagnostic and prognostic tools for NMFI implemented
[unit=1 year]; 95%CI 1.07-1.20), wealth in the lowest quintile (RR=1.24; at different levels of the healthcare system in terms of their impact on
95% CI 1.11-1.39), less than one year of education (RR=1.67; 95%CI mortality and cost. The analysis was undertaken in a range of developing
1.44-1.93), and lower mid-upper arm circumference (RR=1.06 [unit=1cm]; country healthcare infrastructure scenarios, including a comparison of
95%CI 1.04-1.07). In Dar es Salaam, preterm birth is associated with factors such as high vs. low health facility access and public vs. private
maternal age, wealth, and education, which may be surrogates to vs. community health systems. The model is paramaterised using data
unmeasurable factors affecting fetal development. Mid-upper arm on healthcare access, care-seeking behaviour, and epidemiological
circumference, a measure of maternal nutrition, is one modifiable factor and clinical characteristics of febrile illness across a range of countries.
associated with preterm birth. Sensitivity analysis is conducted using data on the sensitivity and specificity
of diagnostic and prognostic tools for identifying NMFI etiology and
741 symptoms of early severe illness. The methods outlined here can be used
to optimise case management strategies across a portfolio of potential
PREDICTORS OF EARLY MODERATE TO SEVERE STUNTING IN diagnostic and prognostic tools being considered for development and
BOLIVIAN INFANTS (0-6 MONTHS) implementation.
Paulina A. Rebolledo1, Michael D. Garber1, Rachel M. Burke1,
Rebecca Heritage1, Rita Revollo2, Juan S. Leon1 743
Emory University, Atlanta, GA, United States, Hospital Infantil Los Andes,
La Paz, Plurinational State of Bolivia CONTROL PROGRAMS WITH A SYSTEM COMBINING
Childhood malnutrition, particularly stunting (low length-for-age), can AVAILABLE TECHNOLOGIES
have long-term adverse effects like impaired cognitive function, increased
risk of chronic disease, decreased economic potential, and increased Seif Shekalaghe1, Humphrey Mazigo2, Omary Juma1, Salim
risk of maternal mortality. Bolivia, a lower-middle-income country, has Abdulla3, Caroline Mavere1, Kassim Kamaka1, John Changalucha2,
one of the highest prevalence of infant malnutrition in the Americas Santiago Ferro4
with an estimated 9.5% of six month old infants being moderately to 1
Ifakara Health Institute, Bagamoyo, United Republic of Tanzania, 2NIMR,
severely stunted. The purpose of this study was to identify predictors Mwanza, United Republic of Tanzania, 3Ifakara Health Institute, Dar-es-
of moderate-to-severe stunting (length-for-age Z score <-2) among Salaam, United Republic of Tanzania, 4Fio Corporation, Toronto, ON,
urban and peri-urban Bolivian children in early infancy (0-6 months of Canada
age). Convenience sampling at outpatient well-child visits was used to RDTs are considered a viable alternative to deliver accurate results at
recruit 185 mother-infant pairs in El Alto, Bolivia, from June to October POC. However, there are still obstacles to the widespread implementation
2011. Researchers collected anthropometric data from mothers (height, of this strategy, such as lack of proper quality assurance of RDT-based
weight) and infants (length, weight, head circumference) at two visits programmes at POC and reporting constraints, especially in remote
(4 to 6 weeks apart) as well as baseline socio-demographic, clinical, areas of low-income countries where the strategy is mostly needed. In
and perinatal characteristics. Multivariable logistic regression was used collaboration between IHI and NIMR, an implementation research study
to identify predictors of being stunted at both visits. The prevalence of was conducted in the Geita District to test the feasibility and usability
being stunted at both visits was 15.7%. Multivariable logistic regression of a system designed to overcome the issues described above. In brief,
showed that breastfeeding (OR:0.29 95%CI[0.1-0.81]), preterm birth the system called Fionet is designed to assist peripheral HCWs in the
(OR: 10.25 95% CI[3.26-32.23]), small-for-gestational age (OR:6.67 95% processing and interpretation of RDTs, and collect and transmit clinical
CI[2.21-20.18]), and inter-birth spacing of less than 24 months (OR:7.21 data to a cloud information service using local cell phone networks.
95% CI[2.08-24.94]) were significantly associated with stunting in this Information captured is useful for evaluation of quality of RDT by district
study population. Although this study was limited in its small sample size authorities. HCWs were trained in the use of mobile devices which
(leading to large standard deviations), its results were consistent with prior contained electronic survey forms easily completed through a touch-
screen interface and at the same time guide RDT processing and perform 745
automated interpretation of the results. All information collected and a
high-resolution image of the RDT was transmitted to a central database DETERMINANTS OF DENGUE MORTALITY BEYOND
located in a cloud information service. Data were safely stored and BIOLOGICAL FACTORS: A SCOPING REVIEW
organized according to predetermined reports and was accessed via a
website . Two patient populations were included in the current study: Mabel Carabali1, Libia Milena Hernandez2, Maria Jose Arauz3,
1- general population (children and adults, male and female) in whom a Luis Angel Villar4, Valéry Ridde5
malaria test was required; and 2- pregnant women attending ANC clinics 1
Dengue Vaccines Initiative/International Vaccines Institute, Seoul, Republic
in whom screening for both malaria and syphilis was performed to prevent of Korea, 2Centro de Atencion y Diagnostico de Enfermedades Infecciosas
mother to child transmission and adverse outcome of pregnancies. HCWs (CDI-APRESIA), Bucaramanga, Colombia, 3Department of Social and
at all government facilities participating in the pilot were able to operate Preventive Medicine, University of Montréal, Montreal, QC, Canada,
the system and collected over 5,000 patients in the course of 8 weeks. 4
Universidad Industrial de Santander, Bucaramanga, Colombia, 5University
Health program managers were able to login to the portal and review of Montreal Hospital Research Centre (CRCHUM)/School of Public Health
cases uploaded, aggregated and organized in predefined reports, enabling (ESPUM), University of Montreal, Montreal, QC, Canada
to make recommendations about program management including Dengue is a viral disease which clinical spectrum varies from unapparent
monitoring of RDT processing in the field. Scale up of a system such as to severe forms and fatal outcomes. Though dengue death is avoidable
Fionet to at least a full-district level is warranted after the encouraging in 99%, every year around 20000 deaths are estimated to occur in more
results of the present study, to fully demonstrate health system than 100 countries. Beyond biological factors, social determinants of
strengthening opportunities in delivery of care, monitoring and evaluation health (SDH) are related to fatal outcomes. A scoping review and content
and improvement in system efficiencies. analysis using QDA Miner was conducted to document the role of SDH in
dengue mortality. Inclusion criteria were any document with information
744 of dengue fatal cases in humans, written in English, Spanish, Portuguese
or French, peer reviewed or grey literature. Using a set of key words
TRAINING AND CAPACITY BUILDING INITIATIVES IN SUPPORT related to dengue mortality, PubMed /LILACS /COCHRANE/Scielo/Science
OF GLOBAL HEALTH SECURITY, 2012-2014 Direct/WHOLIS and Google Scholar, were the electronic databases used.
From a total of 971 documents retrieved, 78 articles met the criteria and
Clara G. Marshall, Christopher L. Perdue, Matthew R. Kasper,
were reviewed. The documents were published in the Americas region
James F. Cummings, Jose L. Sanchez
(50%), Asia (38%), Europe (9%) and Africa (3%). The main article's
Armed Forces Health Surveillance Center, Silver Spring, MD, United States source of information was hospital records (56%) followed by a mix
The Global Health Security Agenda, launched on 13 February 2014, called of surveillance data and hospital records (33%). Ninety-three percent
upon US government agencies to work together towards a vision of "a included any information about the SDH. Information about individual
world safe and secure from global health threats posed by infectious dimension was found in 88.5% of reviewed articles, where age, education
diseases" by engaging with partner nations to strengthen their capacity for and type of infection/immunological status were considered determinants
preventing avoidable epidemics, detecting infectious disease threats early, for dengue deaths. Sixteen articles (20.5%) did mention about health
and responding rapidly and effectively. The Global Emerging Infections systems and described determinants were access, opportunity, quality of
Surveillance and Response System Division of the Armed Forces Health attention and health staff knowledge. Three articles (3.8%) reported socio-
Surveillance Center (AFHSC-GEIS) supports programs that strengthen economic and political context were poverty and social behavior were
global networks for real-time biosurveillance capabilities, train an effective the determinants described. Gender and opportunity of attention were
biosurveillance workforce, and strengthen laboratory systems. In fiscal considered as dengue determinants dependent on social/personal health
years 2012-14, AFHSC-GEIS supported a global health capacity building seeking behavior. Ethnicity was considered as biological determinant that
portfolio that included 67 projects in 34 countries. Specifically, AFHSC- also depends on cultural and socioeconomic context. These findings reveal
GEIS partners executed health system improvements in six main areas: 1) the need for more studies about the role of SDH in dengue mortality, in
electronic disease and biosurveillance systems (29 projects in 15 countries); order to design and implement interventions beyond biological factors in
2) workforce development in WHO-approved epidemiology and outbreak areas such education and the health systems (more data will be available
response methods (23 projects in 20 countries); 3) tropical medicine at the presentation)
training for host-country civilian and military personnel (11 projects in
10 countries); 4) training in, and capacity for, entomological surveillance 746
and control methods (10 projects in 7 countries); 5) accredited laboratory
practices and quality assurance efforts (34 projects in 21 countries); and, LABORATORY QUALITY MANAGEMENT SYSTEM:
6) health care facility and laboratory diagnostic capacity development (18 EXPERIENCE WITH IMPLEMENTATION IN LATIN AMERICA
projects in 16 countries). The results of qualitative analysis of quarterly and AND THE CARIBBEAN
annual reports from AFHSC-GEIS partners indicate that, while challenging,
there has certainly been a progressive evolution of health security Magaly Tejada, Drake H. Tilley, Diana Zorrilla, Jose Calderon,
capacities within the network. Nathanael Reynolds, Silvia M. Montano
U.S. Naval Medical Research Unit - 6, Callao, Peru
Laboratories are essential for public health activities to include disease
surveillance and control and in the treatment of diseases. The Quality
Management System (QMS) in clinical laboratories emphasizes efficient
use of resources, processes and personnel to reduce errors and ensure
reliable and safe results. The aim of the joint CDC DHAPP NAMRU-6
collaborative effort sponsored by DHP and PEPFAR is to strengthen QMS
in clinical laboratories throughout Latin America and the Caribbean (LAC)
to improve and measure compliance with quality laboratory services
and prepare regional laboratories towards accreditation. Since 2012,
18 clinical laboratories in Belize, El Salvador, Guatemala, Honduras,
Nicaragua, Dominican Republic, Colombia and Peru were enrolled in an
improvement program. It began with a 5-week training workshop in
Lima, Peru to include 2-weeks of training in Strengthening Laboratory
Management Towards Accreditation (SLMTA), followed by distance microarray analysis (>90% transcriptome) of adult female mosquito heads
mentoring and technical assistant visits. We conducted baseline laboratory collected every 4 hr over 2 days maintained under LD or constant dark
assessments using the Stepwise Laboratory Improvement Process towards (DD) conditions. Data were subjected to cosine wave analysis (JTK_CYCLE)
Accreditation Checklist (SLIPTA WHO/AFRO), developed by WHO/AFRO to determine for ~24 hr rhythmicity. We generated the Aedes aegypti
for evaluating and monitoring the improvement progress of laboratories Circadian Database, available at http://www.nd.edu/~bioclock/, in which
aiming to achieve the ISO 151889 standards. We report 12 laboratories these gene expression profiles and accompanying stastical analysis are
which have now completed 12 months of the program with before and searchable. This database provides the capability to examine the potential
after evaluations. Among the 12 laboratories assessed, average baseline rhythmicity of the expression profile for each gene, as influenced by the LD
score was 118(78-144), representing 44% compliance with the SLIPTA cycle or the endogenous circadian clock. We identified 4 classes of genes
WHO/AFRO checklist. The average score after 12 months was 14% present within the transcriptome: rhythmic only under LD cycle conditions,
higher at 151(120-180)representing 58% compliance. Among the 12 rhythmic only under DD conditions, rhythmic under both conditions, and
quality management systems evaluated, the three areas with greatest non-rhythmic. The sets of genes active in vision, metabolism, and olfaction
improvement included, customer management and customer service were investigated further, and those associated with vision were in good
(28%), purchasing and inventory process control (16%), and Evaluation agreement with an earlier study on An. gambiae mosquitoes (Rund et
of internal and external quality control (15%). Information management al., 2011 PNAS 108:e421-30). Similarly, Ae. aegypti genes involved in
(9%) and facilities and safety (4%) showed the least improvement. In metabolism and detoxification were under circadian control or non-
conclusion, implementation of the QMS improved multiple areas of rhythmic, as predicted by studies of An. gambiae. Our Ae. aegypti studies
laboratory service and processes in diverse settings across LAC. Results of demonstrate similarities and differences in regulation of transcripts in
the initial post-testing evaluation will guide future training and resources different mosquito species, and suggest temporal modulation of processes
for further improvement and help lead to the permanent adoption of such as vision and metabolism. These gene expression patterns likely
effective laboratory practices. identify both shared traits and the basis of species-specific behaviors.
747 749
Christopher S. Spencer Catalina Alfonso- Parra
Liverpool School of Tropical Medicine, Liverpool, United Kingdom Cornell University, Ithaca, NY, United States
Heme is a double-edged sword, being vital for oxygen transport yet highly Understanding mosquito mating biology is an important step towards
toxic at high concentrations. Heme oxygenase (HO) plays a key role in identifying novel targets for mosquito control. We have begun dissecting
detoxification through heme catabolism. Present in many organisms it the fine-scale mating biology in male Aedes aegypti. Seminal fluid proteins
is particularly well characterised in humans. Surprisingly, however, HO is are produced in the reproductive tract tissues of male insects, primarily in
poorly characterised in hematophagous insect vectors such as mosquitoes, the accessory glands, and are transferred _ along with sperm _ to females
yet such organisms deal with enormous influxes of dietary heme in during mating. Seminal fluid proteins induce numerous physiological and
their bloodmeals. Thus one might expect the enzyme to play a key role behavioral changes in mated females, each of which might be targeted
in survival. Here we are investigating the role of HO in mosquitoes and for novel control strategies. Our work on top candidates for genetic
tsetse flies, which transmit malaria and sleeping sickness respectively. manipulation and the biology of male accessory gland function will be
HOs in both organisms were identified via genome database searches, presented. Finally, and to further comprehend mosquito mating, we
amplified, cloned, and expressed in E. coli. Spectroscopic assays have been analyzed transcriptional changes within the lower female reproductive
done to confirm the catalytic attributes of vector HO in vitro, as well as tract in response to male seminal fluid protein receipt. Our results suggest
Western blotting, qRT-PCR and immunolocalisation studies to investigate a wealth of new targets for control of these important disease vectors.
tissue-specific and temporal variation in HO expression. HPLC analysis is
being conducted to identify the products of the HO reaction pathway. 750
Finally, inhibition of HO activity has been carried out in vivo to determine
the physiological role of HO. Here, a competitive HO inhibitor (zinc IMPACT OF INCREASED INSULIN SIGNALING IN THE FAT
protoporphyrin) was fed to Anopheles gambiae populations. This resulted BODY OF ANOPHELES STEPHENSI AND AEDES AEGYPTI
in a significant reduction in oviposition, suggesting a key role for HO in MOSQUITOES ON LIFESPAN AND REPRODUCTION
egg production. It is hoped that the results of these studies will identify
new targets for the development of novel vector control agents. Lewis Hun, Anam Arik, Kendra Quicke, Patricia Scaraffia, Hemant
Badgandi, Michael Piatt, Michael Riehle
748 University of Arizona, Tucson, AZ, United States
Lifespan is a key factor in determining the transmission efficiency of
THE CIRCADIAN CLOCK AND LIGHT/DARK CYCLE INFLUENCE mosquito borne diseases. Finding a novel mechanism affecting mosquito
RNA EXPRESSION IN THE AEDES AEGYPTI MOSQUITO lifespan could be a valuable tool to control mosquito-borne disease
transmission. The insulin/insulin-growth factor signaling (IIS) pathway may
Matthew T. Leming1, Samuel S. Rund2, Giles E. Duffield1, Joseph
provide a novel endogenous solution to vector control. In mosquitoes,
E. O'Tousa1
the IIS plays an important role in the regulation of many physiological
University of Notre Dame, Notre Dame, IN, United States, 2University of processes, including longevity and reproduction. Here we aimed to
Edinburgh, Edinburgh, United Kingdom increase insulin signaling in the fat body of An. stephensi and Ae. aegypti
The biological rhythms of mosquitoes regulate and/or modify many mosquitoes by creating a transgenic line expressing an active form of Akt,
behaviors and physiological processes underlying disease transmission, a key component of the IIS, specifically in the fat body tissue. We observed
survivability, and fitness. The circadian clock regulation of RNA expression the effects on longevity and reproduction in a heterozygous line. However,
influences physiological and behavioral output on a daily basis. The Aedes contrary to the expected results, we observed an increase in the life span
aegypti mosquito is the major vector of Yellow fever and dengue virus, of heterozygous females positive for the transgene. We also observed no
and exhibits 24 hr rhythms in biting, flight, and oviposition. To better significant difference in the reproductive potential of heterozygous positive
understand the patterns of specific gene expression controlled by the daily versus heterozygous negative females, an effect that was opposite of the
light/dark (LD) cycle or the circadian clock in Ae. aegypti, we undertook a
anticipated result. Ongoing work on this transgenic mosquito may yield detoxification genes were chosen for subsequent quantitative real-time
unique insights into how the insulin signaling cascade regulates lifespan in PCR (qRT-PCR). Microarray analysis revealed significant over expression of
mosquitoes and other eukaryotes. 87 probes and under expression of 85 probes (in pairwise comparisons
between permethrin survivors and unexposed sympatric and allopatric
751 samples from Dar es Salaam (controls). For qRT-PCR we targeted
over expressed ABC transporter genes (ABC '2060'), a glutathione-S-
CROSSTALK OF IMD AND TOR SIGNALING PATHWAYS IN THE transferase, P450s and esterases. Design of efficient, specific primers
IMPORTANT DENGUE VECTOR AEDES AEGYPTI was successful for ABC '2060'and two P450s (CYP6P3, CYP6M2). The
primers for CYP4G16 used were previously used in a microarray study of
Shin-Hong Shiao An. arabiensis from Zanzibar islands. Over expression of CYP4G16 and
National Taiwan University, Taipei, Taiwan ABC '2060'was detected though with contrasting patterns in pairwise
Mosquitoes transmit several devastating infectious disease such as malaria, comparisons between survivors and controls. CYP4G16 was only up
dengue fever, yellow fever, Japanese encephalitis and filariasis. Due to regulated in survivors, whereas ABC '2060'was similar in survivors and
the lack of effective vaccine and the increasing drug and insecticide controls but over expressed in Lower Moshi samples compared to the
resistance, alternative approaches for these mosquito-borne diseases Dar es Salaam samples. Increased transcription of CYP4G16 and ABC
are urgently required. It has been demonstrated that the Toll and the '2060'are linked directly and indirectly respectively, with permethrin
Immune Deficiency (IMD) signaling pathways play crucial roles in the resistance in Lower Moshi An. arabiensis. Our study provides replication of
production of antimicrobial peptides in the Drosophila. Recently, the JNK CYP4G16 as a candidate gene for pyrethroids resistance in An. arabiensis
pathway was shown to be activated by transforming growth factor-β- though its role may not be in detoxification and this requires further
activated kinase 1 (TAK1), the component of IMD pathway, and to play investigation.
an important role in tissue modeling in Drosophila. On the other hand,
Matrix metalloproteinase 1 (MMP1) was demonstrated to be essential for 753
the embryonic development in the Drosophila. Our previous study showed
that Aedes aegypti TAK1 (AaTAK1) is responsible for the production of WNT SIGNALING IS ESSENTIAL FOR THE REGULATION OF
Cecropin A. We also showed the novel role of Aedes aegypti Matrix TOR SIGNALING-MEDIATED EGG PRODUCTION IN THE
metalloproteinase 1 (AaMMP1) in the regulation of vitellogenesis. Our MOSQUITO AEDES AEGYPTI
results revealed that silence of AaTAK1 by RNA interference approach
resulted in the inhibition of AaMMP1 in the translational level. In this Shih-Che Weng
study, we showed that the transcriptional pattern of AaTAK1 is highly College of Medicine, National Taiwan University, Taipei, Taiwan
expressed from 12 to 72 hours after a blood meal and particularly in Mosquito-borne diseases are the most devastating agents for human
the ovary and midgut. By RNAi-mediated silencing of AaTAK1, we being, due to its high diversity of transmissible pathogens like protozoan
showed that the egg production was reduced in the absence of AaTAK1. and viruses. Despite the efforts from government agencies that have
Interestingly, the expression of Vitellogenin (Vg) was inhibited in the contributed the eradication of the mosquito-borne diseases for several
absence of AaTAK1 or with the application of JNK inhibitor (SP600125) decades, the goal has not been achieved yet. Therefore, many research
in the in vitro fat body culture system. In addition, by RNAi mediated institutes turn their attentions toward the mosquito life cycle and immune
silencing of AaJNK, the egg production was also reduced. Furthermore, system to halt the disease transmission. Previous studies have already been
we showed that silencing of AaTAK1 or AaJNK inhibit the phosphorylation demonstrated that Target of Rapamycin (TOR) pathway plays an important
of S6K, a key component of TOR pathway, and also inhibit the expression role in mosquito vitellogenesis, whereas WNT pathway participates in
of Vitellogenin (Vg) and AaMMP1 in the fat body. Taken together, our the embryonic development and cell polarity in Drosophila. However,
data suggest a novel function of AaTAK1 and AaJNK in the regulation of the interactions between these pathways are poorly understood. In this
vitellogenesis and AaMMP1 through TOR signaling pathway. study, we propose a hypothesis that factors of TOR and WNT signaling
pathway play synergistically in the mosquito vitelloginesis. We attempt to
752 characterize Wnt signaling components in the mosquito, Aedes aegypti.
Our results showed that silencing of Aedes aegypti Frizzled2 (AaFz2),
GENETIC BASIS OF PYRETHROID RESISTANCE IN A a transmembrane receptor of Wnt signaling pathway, resulted in the
POPULATION OF ANOPHELES ARABIENSIS, THE PRIMARY decrease of fecundity in Ae. aegypti. We showed that AaFz2 is highly
MALARIA VECTOR IN LOWER MOSHI, NORTHEASTERN expressed in the mosquito fat body at 6 hours post blood meal in turns
TANZANIA of transcriptional and translational level, suggesting the amino acid-
stimulated feature of AaFz2. Interestingly, the phosphorylation of S6K
Johnson J. Matowo1, Chris Jones2, Martin Donnelly2, Bilali and the expression of Vg were inhibited in the absence of AaFz2. These
Kabula3, Hilary Ranson2, Keith Steen2, Franklin Mosha1, Mark findings determine a direct link between Wnt and TOR signaling in the
Rowland4, David Weetman2 regulation of mosquito reproduction.
Kilimanjaro Christian Medical University College, Moshi, United Republic
of Tanzania, 2Liverpool School of Tropical Medicine, Liverpool, United 754
Kingdom, 3National Institute for Medical Research, Tukuyu, Mbeya, United
Republic of Tanzania, 4London School of Hygiene & Tropical Medicine, FUNCTIONAL ANALYSIS OF THIOESTER-CONTAINING
London, United Kingdom PROTEIN COMPLEX IN DENGUE VIRUS INFECTION
Pyrethroid resistance has been slower to emerge in Anopheles arabiensis
Tsun Wang, Shin-Hong Shiao
than in An. gambiae s.s and An. funestus and, consequently, studies are
only just beginning to unravel the genes involved. Permethrin resistance in National Taiwan University, Taipei, Taiwan
An. arabiensis in Lower Moshi, Tanzania has been linked to elevated levels Dengue fever is one of the most devastating arthropod-borne diseases.
of both P450 monoox ygenases and β-esterases. We have conducted a The WHO reported some 2.5 billion people are now at risk from dengue
gene expression study to identify specific genes linked with metabolic and estimates that there may be 50 million cases of dengue infection
resistance in the Lower Moshi An. arabiensis population. Microarray worldwide every year. Up to now, no effective dengue vaccine or drug
experiments employing an An. gambiae whole genome expression has been developed. Therefore, intensive study for potential host factors
chip were performed on An. arabiensis, using interwoven loop designs. in the mosquito vector and construction of transgenic mosquito together
Permethrin-exposed survivors were compared to three separate unexposed with gene drive technique to replace the vector populations became
mosquitoes from the same or a nearby population. A subsection n of an alternative strategy to combat dengue virus. Here, we made use of
the well-established reverse genetic approach by silencing potential While it is known that these changes are induced by male seminal fluid
host factors in the mosquitoes. Our results showed that two immune proteins, what happens in the female to produce these changes is largely
responsive genes, Thioester-containing protein 1 (TEP1) and Leucine-Rich unknown on the molecular level. In order to better understand these
Immune Gene 1 (LRIM1), were highly expressed in response to dengue changes, their associated pathways, and the specific genes involved,
virus infection in the mosquito midgut. Silenced of TEP1 or LRIM1 resulted we used RNA-seq to conduct a differential expression transcriptome
in the over-expression of transcript of dengue virus 2 in the mosquito analysis of the lower reproductive tract (LRT; i.e. the bursa copulatrix,
midgets. Immunofluorescent assay revealed that silenced of TEP1 or spermathecae, common oviduct, and lateral oviducts) of female Ae.
LRIM1 resulted in the over-expression of DENV E-protein in the mosquito aegypti. Comparisons were made between virgin females and those at 0,
midgets. We also demonstrated that the translation level of TEP1 is highly 6, and 24 hours post insemination. Our results provide a framework for
expressed in the mosquito midgut after an infectious blood meal. Taken further investigation of the postcopulatory physiology and behavior of this
together, our results suggest TEP1 or LRIM1 are important candidates important disease vector.
for the establishment of transgenic mosquito against dengue virus. We
are currently in the construction of gain-of-function TEP1 transgenic 757
mosquito line with the blood meal inducible carboxypeptidase promoter.
Our results will provide new insights into the understanding of dengue- INVESTIGATION ON ENTOMOPATHOGENIC FUNGAL
vector interaction and new strategy for dengue eradication program. FAUNA OF MOSQUITOES IN BURKINA FASO: TRANSGENIC
Data revealed by this proposal will be crucial for future studies on vector BIOCONTROL PERSPECTIVES
competence and vector control in the field.
Etienne Bilgo
755 IRSS/Centre Muraz, Bobo Dioulasso, Burkina Faso
Unlike bacteria and viruses, fungi infect mosquitoes through direct
MOSQUITOCIDAL PROPERTIES OF IGG TARGETING THE contact with the cuticle and so lend themselves to strategies currently
GLUTAMATE-GATED CHLORIDE CHANNEL IN THREE used for delivery of chemical insecticides, and in addition may provide
MOSQUITO DISEASE VECTORS (DIPTERA: CULICIDAE) environmentally preferred alternatives. Much attention has focused on the
ascomycetes Metarhizium spp. and Beauveria spp. However it should be
Jacob I. Meyers, Meg Gray, Brian D. Foy noted that not much is known about fungal pathogens of adult malaria
Colorado State University, Fort Collins, CO, United States mosquitoes in the field. In that respect this study aims to investigate
Mosquito-borne diseases account for an estimated 1,434,000 deaths entomopathogenic fungi which naturally infect mosquitoes in Africa and
annually and 60,056,000 disability adjusted life years. Historically, the most their potential use as genetically engineered biocontrol agents. The field
successful strategies to control disease transmission have been by targeting collection of mosquitoes was carried out in Burkina Faso. Mosquitoes
mosquito vectors through the use of chemical insecticides. The glutamate- were collected alive and maintained in insectary conditions with access
gated chloride channel (GluCl) is a conserved and highly sensitive target to sugar water till death. Every morning, dead mosquitoes were collected
of the drug ivermectin. As an alternative to using chemical insecticides and isolated individually in a petri dish for fungal growth. Fungal isolation
to kill mosquitoes, we tested the effects of purified immunoglobulin G and culture was conducted in a sterile environment. Two different
(IgG) targeting the extracellular domain of GluCl from Anopheles gambiae growth media were used. Potato Dextrose Agar, a common medium for
(AgGluCl) on the survivorship of three mosquito disease vectors that vary isolating fungi, and Potato dextrose agar + CTAB + Chloramphenicol,
in their sensitivity to ivermectin: Anopheles gambiae s.s. > Culex tarsalis selective medium. The analysis is ongoing to unravel an exhaustive list
> Aedes aegypti. AgGluCl IgG mixed in a single blood meal significantly of entomopathogenic fungi. The natural virulence of these fungi toward
reduced the survivorship of An. gambiae (LC50 =2.82mg/mL [2.68-2.96]), malaria vectors will be subsequently tested. Final results will be available in
as did serially blood feeds containing 1/10th of the LC50 concentration. coming months, before October 2014.
However, AgGluCl IgG did not affect the survivorship of A. aegypti or C.
tarsalis. Transcriptional analyses showed AgGluCl mRNA was present in 758
the An. gambiae adult female head and thorax, but not the abdomen
and immunohistochemical staining showed AgGluCl expression only in DETECTION OF POINT-MUTATIONS IN THE KDR GENE OF THE
the antenna, Johnston's Organ, supraesophageal ganglion and thoracic DENGUE VECTOR AEDES ALBOPICTUS
ganglia. Interestingly, injection of AgGluCl IgG into the hemocoel equally
reduced the survivorship of An. gambiae, A. aegypti and C. tarsalis,
Jiabao Xu1, Mariangela Bonizzoni2, Daibin Zhong2, Guiyun Yan2,
suggesting that AgGluCl IgG sensitivity of blood fed An. gambiae is due
Xiaoguang Chen1
to permissive antibody diffusion across the midgut. To analyze AgGluCl
Key Laboratory of Prevention and Control of Emerging Infectious Diseases
IgG's mode of action, we fed An. gambiae blood meals containing both of GD Higher Education Institute, Guangzhou, China, 2Public Health,
AgGluCl IgG and ivermectin (a GluCl agonist). AgGluCl IgG attenuated the University of California Irvine, Irvine, CA, United States
mosquitocidal effects of ivermectin, suggesting that AgGluCl IgG acts as a The Asian tiger mosquito, Aedes albopictus, is the most invasive mosquito
GluCl antagonist. These data characterize mosquito GluCl as an important in the world and a main vector of dengue, chikungunya and other viruses.
insecticide and immunological target, further the science of developing Though Ae. albopictus originated from east Asia, in recent 30 years,
mosquitocidal vaccines, and lend insight into the unique properties of the it has migrated to all of the continents except Antarctica. Treatment
Anopheles midgut relative to other mosquitoes. of public areas with high population density of Ae. albopictus with
adulticides, mainly pyrethroids, is a recommended protective measure in
756 response to Dengue epidemics and routine treatments with insecticides
and is performed alongside source reduction through environmental
POST-INSEMINATION TRANSCRIPTIONAL RESPONSE IN THE modification. Intensive pyrethroid application poses selection pressure on
LOWER REPRODUCTIVE TRACT OF AEDES AEGYPTI FEMALES mosquito populations for increased resistance. Physiological resistance
to pyrethroids has been documented already in several Ae. albopictus
Ethan Degner, Catalina Alfonso, Laura Harrington populations, mainly from the native home range in Asia, abrading the
Cornell University, Ithaca, NY, United States sustainability of control programs based on these insecticides. Field
Insemination induces substantial changes in female Aedes aegypti collections of Ae. albopictus were conducted in six sites throughout the
mosquitoes. Physiologically, inseminated females accelerate blood Guangdong province in South China and subjected to standard WHO
digestion and oogenesis. Behaviorally, they increase oviposition, alter host- tube assays with 0.045% deltamethrin based on discrimination dose
seeking behavior, and become refractory to subsequent insemination. determined by the Ae. albopictus reference susceptible strain. Between
375 and 658 females were tested per site. Mortality ranged between 760
28.3% and 84.9%, indicating wide-spread phenotypic resistance in
south China. Apart from standard WHO tube assay, rapid and reliable PYRETHROID SUSCEPTIBILITY OF MALARIA VECTORS IN
detection of resistance is recognized as an important element of resistance FOUR DISTRICTS IN WESTERN KENYA
management. Historically, the most used markers for pyrethroid resistance
are mutations in the para-gated sodium channel gene (kdr gene) the Eric O. Ochomo1, Nabie M. Bayoh2, Luna Kamau3, Francis
pyrehtroid target site. Here we report the current polymorphism of the kdr Atieli2, John Vulule2, Collins Ouma1, Maurice Ombok2, Kiambo
gene in 10 world-wide populations across the world. A total of seven non- Njagi4, David Soti4, Evan Mathenge5, Lawrence Muthami6, Teresa
synonymous mutations were identified. Although the frequency of non- Kinyari7, Krishanthi Subramaniam8, Immo Kleinschmidt9, Martin J.
synonymous mutations was generally low, one population from southern Donnelly8, Charles Mbogo10
China showed 41.9% frequency, suggesting that kdr point mutations 1
Maseno University, Kisumu, Kenya, 2KEMRI/Centers for Disease Control
are widely spread among Ae. albopictus population in various part in the and Prevention Research and Public Health Collaboration, Kisumu, Kenya,
world. 3
KEMRI–Centre for Biotechnology and Research Development, Nairobi,
Kenya, 4Division of Malaria Control, Ministry of Health, Nairobi, Kenya,
759 5
KEMRI-Eastern and Southern Africa Centre of International Parasite
Control, Nairobi, Kenya, 6KEMRI-Centre for Public Health Research,
THE ANOPHELES GAMBIAE MOSQUITO MIDGUT Nairobi, Kenya, 7Department of Medical Physiology, University of Nairobi,
TRANSCRIPTOME BY RNA-SEQ Nairobi, Kenya, 8Department of Vector Biology, Liverpool School of
Tropical Medicine, Liverpool, United Kingdom, 9London School of Hygiene
Alvaro Molina-Cruz1, Alejandro Padrón1, Mariam Quinones2, & Tropical Medicine, London, United Kingdom, 10KEMRI-Centre for
José M. Ribeiro1, Urvashi Ramphul1, Janneth Rodrigues1, Kui Geographic Medicine Research-Coast, Kilifi, Kenya
Shen2, Ashley Haile1, José Luis Ramirez1, Carolina Barillas-Mury1
Implementation of insecticide resistance monitoring programs is necessary
Laboratory of Malaria and Vector Research/National Institute of Allergy to ensure continued efficacy of insecticide-based interventions long lasting
and Infectious Diseases/National Institutes of Health, Rockville, MD, United insecticidal nets (LLINs) and indoor residual spraying (IRS). This study was
States, 2National Institutes of Health, Rockville, MD, United States designed to investigate the extent and distribution of pyrethroid resistance
The mosquito midgut is the first organ to interact with malaria parasites. in 4 districts of western Kenya (Nyando, Rachuonyo, Bondo and Teso).
This tissue can mount effective antiplasmodial responses that limit parasite All four districts have received long lasting insecticide treated nets (LLINs)
survival and disease transmission. RNA-Seq by Illumina sequencing of the while Nyando and Rachuonyo districts have had indoor residual spray (IRS)
midgut transcriptome was used to identify new genes and transcripts, campaigns for 3-5 years using a mix of pyrethroids. This study is part of
contributing to refinement of Anopheles gambiae genome annotation. a project (Implications of Insecticide Resistance) that aims to determine
We sequenced ~223 million reads from An. gambiae midgut cDNA the impact of insecticide resistance on the efficacy of malaria control
libraries generated from susceptible (G3) and refractory (L35) mosquito interventions. Three day old adult mosquitoes from either larval samples
strains after Plasmodium berghei or P. falciparum infections. In total, collected in the field, or F1s raised from blood-fed females collected from
22,889 unique midgut transcript models were generated from both An. houses, were used for WHO tube bioassays with mortality recorded 24
gambiae strain sequences combined, and 76% are potentially novel. hours post exposure. Resistance level was assigned based on the WHO
Of these novel transcripts, 49.5% aligned with annotated genes and 2013 guidelines. Once exposed, samples were identified to species
appear to be isoforms or pre-mRNAs of reference transcripts, while using PCR. Results Anopheles arabiensis comprised at least 94% of all
50.5% mapped to regions between annotated genes and represent novel An. gambiae s.l. in Bondo, Rachuonyo and Nyando. Teso was a marked
intergenic transcripts (NITs). Predicted transcripts were validated for midgut contrast case with 77% of all samples being An. gambiae s.s. Mortality
expression using qRT-PCR and microarray analysis, and novel isoforms were to insecticides varied widely between clusters even in one district with
confirmed by sequencing. Coding potential analysis revealed that 43% mortality to deltamethrin ranging from 45-100%, while to permethrin
of total midgut transcripts appear to be long non-coding RNA (lncRNA), the range was 30-100%. Mortality to deltamethrin in Teso district ranged
and functional annotation of NITs showed that 68% had no homology to from 44-95.4% in An arabiensis and 28-85.4% in An. gambiae s.s.
current databases from other species. Reads were also analyzed using de To permethrin, mortality ranged between 5.9-95% and 34.6-100% in
novo assembly and predicted transcripts compared with genome mapping- An. arabiensis and An. gambiae s.s. respectively although a Wilcoxon
based models. Finally, variant analysis of G3 and L35 midgut transcripts signed-rank test failed to show consistently higher or lower resistance
detected 160,742 variants with respect to the An. gambiae PEST genome, in any one vector compared to the other (Z = 0.1, P = 0.9203). Cluster
and 74% were new variants. This in-depth sequencing and assembly of specific mortality of An. arabiensis between permethin and deltamethrin
the An. gambiae midgut transcriptome doubled the number of known were not correlated (Z = 2.9505 , P = 0.2483) . In conclusion, our results
transcripts and tripled the number of variants known in this mosquito show high levels of pyrethroid resistance in western Kenya with intense
species. It also revealed existence of a large number of lncRNA and opens spatial heterogeneity. The observation that insecticide resistance can vary
new possibilities for investigating the biological function of many newly within small geographical areas may allow evaluation of the impact of
discovered transcripts. resistance on the efficacy of malaria control interventions within similar
eco-epidemiological zones.
761 Yanfolila where it was susceptible to lambda-cyhalothrin (98.0%) [IC
95%, 98_99.8] and to DDT (100%). An. gambiae s.l. was susceptible
LIFE SHORTENING EFFECT OF OLYSET® DUO, A LONG- to the bendicarb in Gao, Bougouni, Djenné, Yanfolila and Tombouctou,
LASTING INSECTICIDAL NET INCORPORATING A MIXTURE OF while suspected resistance was observed in Kati, Niono, Bandiagara and
PYRETHROID AND PYRIPROXYFEN, AGAINST PYRETHROID- Kita. Except in Niono, a rice cultivation area (92% [IC 95 % 88.3_94.8]
RESISTANT MOSQUITO mortality), An. gambiae s.l. population was fully susceptible to the
Fénitrothion in all sentinel sites. These results showed resistance of
John R. Lucas1, John Invest1, Kazunori Ohashi2, Hayato Teshima2, Anopheles gambiae s.l. population to pyrethroids in the majority of
Yoshinori Shono2 the sentinel sites. Therefore, we suggest to the NMCP to alternate the
Vector Control Division, Sumitomo Chemical, UK, Plc., London, United pyrethroid with the Fenitrothion as management strategy to the current
Kingdom, 2Health and Crop Sciences Research Laboratory, Sumitomo resistance.
Chemical Co., Ltd., Hyogo, Japan
The increase in pyrethroid resistance in mosquitoes across Sub Saharan 763
Africa has become a serious threat for malaria vector control, and
threatens to reverse the recent gains achieved by the widespread use of
bed nets. New bed net products are clearly needed to maintain these CONTROL OF DENGUE OUTBREAKS BY SYSTEMATIC REVIEW
gains. It has previously been shown that contact of adult mosquitoes with AND META-ANALYSIS
pyriproxyfen treated materials can dramatically reduce egg laying and Leigh Bowman, Philip J. McCall
shorten the life expectancy of exposed females. Pyriproxyfen treated bed
Liverpool School of Tropical Medicine, Liverpool, United Kingdom
nets could therefore be used as a resistance management tool against
to help prevent the selection of pyrethroid resistance. These findings led Dengue is the most widespread mosquito-borne arboviral disease
to the development of Olyset® Duo which is a long-lasting insecticidal worldwide with an estimated 400 million cases occurring annually and
mosquito net incorporating a mixture of 2% w/w permethrin and 1% almost half of the world's population at risk. At present, preventing
w/w pyriproxyfen on all sides of the net. In this study we evaluate the life and responding to dengue outbreaks both rely on vector control to
shortening effect of this net against susceptible and pyrethroid-resistant suppress vector populations or reduce dengue virus transmission, most
malaria vectors in the laboratory. Olyset Duo and PPF LN, a pyriproxyfen commonly by eliminating or larviciding mosquito breeding sites and
alone net, were washed 3 times according to WHO guidelines and space-spraying with insecticide, respectively. Other approaches are also
exposed to a susceptible (Kisumu) and a kdr resistant strain (VK7) of available and used widely, but with none considered to be sufficiently
Anopheles gambiae in the WHO tunnel test. Contact with the PPF LN proven or reliable enough for recommendation, perceptions or beliefs
significantly reduced the survival rate of blood-fed females of both strains, regarding the effectiveness of each approach vary widely among decision-
while contact with Olyset Duo killed the susceptible strain and reduced makers in the public health community, often without foundation.
the longevity of surviving blood-fed females of the resistant strain, when Addressing this within the aims of the European Union supported IDAMS
compared with the effect of exposure to untreated netting. These results research consortium (International Research Consortium on Dengue
indicate that Olyset Duo could reduce vectorial capacity of malaria vectors Risk Assessment, Management and Surveillance; www.idams.eu), we
through the life shortening effect of pyriproxyfen and thus disrupt the undertook a systematic review and meta-analysis of the evidence available
malaria transmission cycle (since a reduction in longevity of as little as 30% from published studies, to determine if specific vector control tools could
can reduce vectorial capacity by approximately 300 times). The cumulative impact on vector abundance and/or dengue incidence. A total of 945
impacts of mortality of mosquitoes from exposure to permethrin, and the studies were found during systematic searches of peer-reviewed databases
suppression of progeny combined with the observed life shortening effects and grey literature; 35 of these satisfied all inclusion and exclusion
on females that survive permethrin exposure are anticipated to have criteria and were subject to the Quality Assessment Tool for Quantitative
significant impacts on malaria transmission under field conditions. Studies (QATQS). The PRISMA guidelines were followed to ensure
rigorous application of review principles. Control approaches included
762 insecticide fogging/space-spraying, insecticide-treated materials, vector
trap devices, house screening, mosquito coils and other repellents, clean-
ANOPHELES GAMBIAE SENSU LATO POPULATION up or environmental management and biological control agents. Initial
SUSCEPTIBILITY TO THE COMMONLY PUBLIC USED analyses indicate that house screening and community-based programmes
INSECTICIDES FOR MALARIA CONTROL IN MALI can potentially have a beneficial impact, while evidence suggests that
repellents and traps do not. Complete results of all final analyses will be
Moussa Keita1, Sitan Traore2, Adama Sacko1, Boubacar presented and the implications of the findings for dengue control in the
Coulibaly1, Seydou Doumbia1, Sekou Fantamady Traore1, Nafomon face of today's realities will be fully considered.
International Center for Excellency in Research/Malaria Research and 764
Training Center, Bamako, Mali, 2National Malaria Control Program,
Bamako, Mali INVESTIGATING THE MECHANISMS OF DDT AND DIELDRIN
Current vector control strategies are mainly based on the use of chemical RESISTANCE IN FIELD POPULATION OF ANOPHELES
insecticides for insecticide-treated nets (ITNs) and indoor residual spraying FUNESTUS IN SENEGAL
(IRS) of houses. Mosquito resistance to at least one of the insecticides Badara Samb1, Charles S. Wondji2, Ibrahima Dia3, Lassana
used for malaria control has been observed in many countries including Konate1, Ousmane Faye1
Mali. Consequently, monitoring insecticide resistance is a key element of 1
Laboratoire d'Ecologie Vectorielle et Parasitaire, Département de Biologie
the implementation of insecticide-based vector control interventions. The
Animale, Université Cheikh Anta Diop, Dakar, Senegal, 2Liverpool School
aim of this study was to update data on vectors resistance to insecticides
of Tropical Medicine, Liverpool, United Kingdom, 3Unité d'Entomologie
in National Malaria Control Program's sentinel sites in Mali. World Health
Médicale, Institut Pasteur de Dakar, Dakar, Senegal
Organization standard bioassay method was used to assess resistance
in 3-5 days old F0 or F1 adult female An. gambiae s.l.. Insecticides were Insecticide resistance in Anopheles funestus, one of the main malaria
Lambda-cyhalothrin 0.05%, DDT 4%, Permethrin 0.75%, Deltamethrin vectors, is threatening malaria control in Africa. Elucidation of the
0.05%, Bendiocarb 0.1% and Fenitrothion 1.0%. Results: Suspected to mechanisms of resistance is crucial to the design of suitable resistance
confirmed phenotypic resistance of Anopheles gambiae s.l. population management strategies. Therefore, we have investigated the mechanisms
were observed for all tested pyrethroids and DDT in all sites except in responsible for DDT and dieldrin resistance in An. funestus population
from Senegal. Insecticide susceptibility assays were carried out using 2-5 766
day old F1 adults generated from indoor-collected, blood-fed female
of An. funestus from Gankette, in Northern Senegal. WHO bioassays INSECTICIDE RESISTANCE IN ANOPHELES FUNESTUS IN
indicated that An. funestus is resistant to lambda-cyhalothrin 0.05% SOUTHEASTERN AFRICA AND ITS IMPACT ON MALARIA
(74.64% mortality / n = 222), DDT 4% (83.36% mortality / n = 158) CONTROL PROGRAM FAILURE
and deltamethrin 0.05% (88.53% mortality / n = 114). Suspected
resistance was observed to permethrin 0.75% (91.19% mortality / n = Maureen Coetzee
139), bendiocarb 0.1% (94.13% mortality / n = 157) and dieldrin 4% University of the Witwatersrand, Johannesburg, South Africa
(96.41% mortality / n = 306). However this population is fully susceptible Malaria parasites are transmitted to humans by anopheline mosquitoes.
to malathion 5 % (100% mortality / n = 50) and fenitrothion 1% (100% The parasite undergoes an obligatory sexual stage within the mosquito
mortality / n = 55). Genome-wide transcription analysis using microarray midgut that takes up to 14 days to complete. This presents a window of
and quantitative RT-PCR revealed that the cytochrome P450 CYP6M7 was opportunity for us to control the mosquito populations before they have
the detoxification gene most commonly over-expressed in DDT resistant sufficient time to become infective. Unfortunately, both mosquitoes and
mosquitoes and field unexposed to insecticide compared to a laboratory parasites have been around a lot longer than humans and so far have
susceptible strain. In addition, several others genes with diverse functions managed to find ways of getting around all the insecticides and drugs
including glutathione S-transferases were also overexpressed. Using the that we throw at them. In Africa today there are approximately 140
pyro-sequencing method, The A296S Rdl(R) target site mutation was recognised species of Anopheles mosquitoes. Only 4 of these are really
detected in all dieldrin resistant mosquitoes but at a low frequency (14%) good vectors of malaria parasites and of these 4, Anopheles funestus
in the field sample. Our study has revealed a strong association between is the most important vector in the south-eastern African region. It is
the dieldrin resistance phenotype and the presence of the Rdl mutation. highly adapted to humans and human habitations and should, therefore,
TaqMan genotyping revealed that the L119F mutation in the GSTe2 be easy to control using current technology. Unfortunately, it has
gene conferring DDT resistance in Benin is completely absent in Senegal. developed high levels of resistance to the pyrethroid insecticides that
This indicates a shift of DDT resistance mechanisms in West Africa An. are used for both treating bed nets and spraying on the inside walls of
funestus. These results could help to guide the implementation of suitable houses. Recent entomological surveys in Zimbabwe, Zambia, Malawi and
control interventions against this vector in Senegal. Mozambique show an almost uniform profile of resistance in An. funestus
with unpublished data from Zimbabwe indicating a definite impact on
765 programme failure. There is an urgent need for resistance management
strategies to be implemented in these countries.
Cherry L. Dykes1, Martin J. Donnelly1, Mark J. Paine1, Om P.
Liverpool School of Tropical Medicine, Liverpool, United Kingdom,
National Institute of Malaria Research (Indian Council of Medical Edward Thomsen1, Clare Strode2, Kay Hemmings1, Angela
Research), Delhi, India Hughes1, Emmanuel Chanda3, Mulenga Musapa3, Mulakwa
Anopheles stephensi, a sub-tropical species distributed throughout the Kamuliwo3, Faustina Phiri3, Lucy Muzia4, Javan Chanda4, Alister
Middle-East and South Asia is one of the major malaria vectors in India Kandyata3, Brian Chirwa4, Kathleen Poer4, Janet Hemingway1,
mainly in urban areas. Resistance to DDT in this vector has been reported Hilary Ranson1, Michael Coleman1
in India since 1965, and development of incipient resistance against 1
Liverpool School of Tropical Medicine, Liverpool, United Kingdom, 2Edge
pyrethroids has recently also been reported. One of the mechanisms Hill University, Ormskirk, United Kingdom, 3National Malaria Control
of resistance in insects is reduced sensitivity of the insects to these two Centre, Lusaka, Zambia, 4Abt Associates, Lusaka, Zambia
insecticides due to alteration in the target site_the voltage gated sodium There has been a rapid scale-up of vector control for malaria in the last
channel (VGSC). A single amino acid substitution in the VGSC (kdr ten years. Both of the primary strategies, long-lasting insecticidal nets
mutation) is known to significantly alter the susceptibility of vector to and indoor residual spraying, rely on the use of a limited number of
insecticides by altering channel kinetics. The role of alternative splicing insecticides. Insecticide resistance has rapidly increased in prevalence
which reorganizes a primary transcript to generate multiple transcripts, in and has come to the forefront as an issue that needs to be addressed
insecticide resistance is not yet known in insects although such events are in order to maintain the sustainability of control efforts in the drive to
known to significantly alter the channel kinetics. To understand the extent elimination. Zambia's programme reported high levels of resistance to
of alternative splicing in An. stephensi, and the possible role in generating the insecticides it used in 2010. As a result, it increased its investment
altered sensitivity to DDT and pyrethroids, the whole coding region of in resistance monitoring to support informed resistance management
VGSC gene of DDT- and pyrethroid-resistant mosquitoes was amplified in decisions. A national survey on insecticide resistance in Zambian malaria
two overlapping fragments, cloned and sequenced. Analysis of sequences vectors, covering 26 districts in all 10 provinces, was performed using
revealed extensive alternative splicing events. These include seven different WHO bioassays to detect resistant phenotypes. Molecular techniques
exon-skipping events, four alternative acceptor sites, two mutually were used to detect target-site mutations and microarray to detect
exclusive exons and one intron-retention. In addition to these alternative metabolic resistance mechanisms. Anopheles gambiae s.s. was resistant
splicing events, modification at the 5' un-translated region has also been to pyrethroids, DDT and carbamates, with potential organophosphate
recorded where quadruplet repeats of 30 nucleotides are seen. Preliminary resistance in one population. The resistant phenotypes were conferred by
data in our study showed two splicing events to be pronounced in both target-site and metabolic mechanisms. Anopheles funestus s.s. was
resistant clones. The role of such splicing events is being examined to largely resistant to pyrethroids and carbamates, with potential resistance to
determine correlation with DDT and pyrethroid resistance. DDT in two locations. The resistant phenotype was conferred by elevated
levels of cytochrome p450s. Currently, the Zambia National Malaria
Control Centre is using these results to inform their vector control strategy.
The methods employed here can serve as a template to all malaria-
endemic countries striving to create a sustainable insecticide resistance
management plan.
768 tear on protectiveness. Mortality rate of A. gambiae with Interceptor 1
was constantly less than 20% after 10 or 15 washes, and was presumably
INCREASED EXPRESSION OF METABOLIC RESISTANCE due to the high level of pyrethroid resistance in this species. Nets treated
CANDIDATE MUTATIONS IN THE MALARIA VECTOR with the insecticide mixtures and washed 15 times induced 3 times higher
ANOPHELES GAMBIAE SENSU STRICTO IN DAR ES SALAAM, mortality of A. gambiae (58-60%) than the Interceptor 1. The differences
TANZANIA in mortality of An. gambiae between mixtures with low and high dosages
chlorfenapyr were not significant, nor was the difference between low
Bilali I. Kabula1, Johnson Matowo2, Bernard Batengana1, Craig S. and high dosed binders. After washing 15 times, the LN treated with
Wilding3, Emily J. Rippon3, Keith Steen3, William Kisinza1, Stephen the mixtures inhibited A gambiae biting (32–44%) by a greater margin
Magesa1, Franklin Mosha2, Martin J. Donnelly3 than the Interceptor 1 (20%). The study demonstrates the availability
National Institute for Medical Research, Tanzania, Muheza, Tanga, of a resistance-combating dual active ingredient mosquito nets that
United Republic of Tanzania, 2Kilimanjaro Christian Medical University resist at least 15 washes of the WHO standard practices and restore the
College, Moshi, United Republic of Tanzania, 3Liverpool School of Tropical effectiveness of ITNs in areas compromised by the spread of pyrethroid
Medicine, Liverpool, United Kingdom resistance.
One of the major challenges facing malaria control is the development of
insecticide resistance in vector mosquitoes. Anopheles gambiae, which is a 770
major vector of the malaria parasite Plasmodium falciparum in Africa, has
over the years developed resistance to dieldrin, 1,1-bis(p-chlorophenyl)-
2,2,2-trichloroethane (DDT), and pyrethroids. The objective of this study MIXTURE OF CHLORFENAPYR AND ALPHACYPERMETHRIN
was to determine the mechanisms contributing to DDT resistance in CONTROLS MULTI-RESISTANT ANOPHELES MOSQUITOES
Anopheles gambiae s.s. in Dar es Salaam, Tanzania. Female mosquitoes UNDER FIELD CONDITIONS AFTER MULTIPLE WASHING:
of standard age, reared from larvae sampled across a variety of natural EXPERIMENTAL HUT RESULTS FROM EAST AFRICA AND
breeding sites, were used in the study. Members of the An. gambiae IMPLICATIONS FOR WHOPES TESTING GUIDELINES
complex were PCR-identified and screened for target-site mutations
(Vgsc-1014S and Vgsc-1014F). A DDT-resistant population of An. gambiae
Richard M. Oxborough1, Raphael N'Guessan1, Rebecca Jones1,
s.s. and controls (sympatric and allopatric controls) were screened for
Jovin Kitau2, Corine Ngufor1, Martin Akogbeto3, Franklin W.
GSTe2 and P450 genes-expression profiles using real-time quantitative
Mosha4, Mark W. Rowland1
polymerase chain reaction (qPCR) tests. A significantly higher allelic
London School of Hygiene & Tropical Medicine, London, United Kingdom,
frequency of the Vgsc-L1014S mutation was found in DDT-resistant An.
Kilimanjaro Christian Medical Universtiy College, Moshi, United Republic
gambiae s.s. than in the control mosquitoes (p<0.001). The cytochrome of Tanzania, 3Centre de Recherche Entomologique de Cotonou, Cotonou,
P450 genes Cyp6m2, Cyp6p3, Cyp6z3 and Cyp6z1 were significantly over- Benin, 4Kilimanjaro Christian Medical University College, Moshi, United
expressed in DDT-resistant An. gambiae s.s. compared with the control Republic of Tanzania
populations. We report increased expression of multiple DDT-associated The emergence and spread of pyrethroid-resistant Anopheles across
resistance mechanisms in the primary African malaria vector, An. gambiae Africa is a grave threat to malaria control. There is an urgent need for
s.s. in Dar es Salaam. The presence of multiple resistance mechanisms in non-pyrethroid, wash-resistant LLINs to be developed. Chlorfenapyr is a
An. gambiae that are common to both DDT and pyrethroids may have pyrrole insecticide with a distinct mode of action which disrupts cellular
confounding effect in resistance-management strategies. However, the respiration. Interceptor 2 is a 'coating' LLIN containing a mixture of
geographical extent of the insecticide resistance mechanisms observed in chlorfenapyr (CFP) and alphacypermethrin-α. This study assessed wash-
this study needs to be investigated further. resistance in experimental hut field trials and explored the properties
of CFP in laboratory tests based on current WHOPES guidelines and
769 behavioural tests. Hut trials in Tanzania with the mixture LLIN killed
63% and 66% of An. arabiensis when unwashed and 10 times washed
EFFICACY OF LLIN MIXTURES OF CHLORFENAPYR AND respectively, compared with 46% for the pyrethoid LLIN (Interceptor 1-α
ALPHACYPERMETHRIN AGAINST PYRETHROID RESISTANT only) washed 10 times. HPLC showed that after 10 washes Interceptor
ANOPHELES GAMBIAE: AN EXPERIMENTAL HUT TRIAL IN 2 had 75% CFP and 95% α still remaining. This is the first report of a
BENIN non-pyrethroid insecticide on a LLIN performing successfully after multiple
washes. By contrast the standard WHO bioassays failed to predict the
Raphael N'Guessan1, Corine Ngufor1, Abibathou Odjo2, Estelle performance of chlorfenapyr and therefore need urgent revision otherwise
Vigninou2, Martin Akogbeto2, Mark Rowland1 suitable insecticides may be overlooked. The three minute bioassay of
London School of Hygiene & Tropical Medicine, London, United Kingdom, CFP nets produced <15% mortality while LLIN require >80% mortality
Centre de Recherche Entomologique de Cotonou, Cotonou, Benin to pass the LLIN test. In laboratory testing there was a strong positive
Insecticide Treated Nets (ITNs) and Indoor Residual Spraying (IRS) have correlation between temperature and mortality above and below standard
and will continue to save millions of lives in Africa. However, malaria test temperature. Bioassay tests conducted during the night produced
vectors are developing incredible resistance to existing insecticides and consistently higher levels of mortality than the same tests in the day
current gains may be lost if new generation tools are not made available time. It appears that conversion of CFP to the active metabolite and its
soon. The mixture of dual unrelated active ingredients on mosquito net disruption of respiratory pathways is enhanced at night when the host
maybe a solution as it presents an opportunity for improved control seeking mosquito is more metabolically active during the active phase
and management of pyrethroid resistance through the simultaneous of its circadian rhythm. Testing according to WHOPES guidelines are not
exposure to both compounds. With industry and IVCC, we have come suitable for certain types of non-neurotoxic insecticide which, though
to develop a new generation of bednet incorporating alphacypermethrin highly effective in field trials, would be overlooked at the screening stage
and chlorfenapyr that may counter growing insecticide resistance in of evaluation through conventional bioassay.
west Africa. Samples of these new nets treated with chlorfenapyr or
chlorfenapyr-alphacypermethrin mixtures with binders were washed
gradually, 10 and 15 times and evaluated each time in experimental
huts against pyrethroid resistant Anopheles gambiae in Central Benin.
Interceptor 1, an alphacypermethrin-impregnated polyester LLIN (WHO
approved) washed to same extent was used as positive control. The nets
were deliberately holed with six holes to examine the effect of wear and
771 showed that only 28% of houses had all rooms sprayed, leaving 72% of
houses partially sprayed, and insecticide concentration varied dramatically
A NEW PROMISING LONG LASTING INSECTICIDE NET IN THE across sprayed walls. The PQK is an easy to use quality assurance tool for
CONTROL OF INSECTICIDE RESISTANT VECTORS: OLYSET monitoring of pyrethroid application rates and improving the quality of IRS
DUO®: A PYRIPROXYFEN AND PERMETHRIN MIXTURE NET campaigns.
most effective vector control tool is the long lasting insecticidal nets (LNs). Ouidah, Benin, 3University of Cape Coast, Cape Coast, Ghana, 4CSRS,
LNs rely on pyrethroid insecticides to provide a repellent barrier between Abidjan, Côte D'Ivoire
humans and mosquitoes and kill mosquitoes before they can transmit The Anopheles Ace-1 gene encodes the neurotransmitter
malaria. Pyrethroid resistance is now occurring in most countries and can acetylcholinesterase, the target of organophosphate and carbamate
undermine the effectiveness of the LN. The development of new tools insecticides, which are of growing importance for vector control. A single
combining chemical with different mode of action is a necessity to control base mutation (G119S), which causes a major conformational change
resistant vector and sustain the gain achieved in controlling malaria. in the protein, gives resistance to both insecticide classes in mosquitoes.
Olyset Duo is a new LN combining a permethrin and pyriproxyfen an However, the nature, evolution and phenotypic consequences of the
insect growth regulator. Pyriproxyfen can sterilize adult mosquitoes and more recently identified copy number variation (CNV) of Ace-1 are far
incorporated on a net reduce the vector density. The efficacy and wash less well understood in An. gambiae. We show that CNV is present
resistance of Olyset Duo is currently evaluated in Lower Moshi, Tanzania. throughout West Africa and appears to be ubiquitously associated with
Standard WHO cone, cylinder and tunnel test has been performed in the resistant (119S), but is much less commonly associated with wild-type
laboratory to evaluate mortality, blood feeding inhibition, reduction in susceptible (119G) alleles. In Culex pipiens Ace-1 CNV is well known
fecundity and fertility of adult female anopheles exposed to Olyset Duo. and involves duplication which pairs a 119G and a 119S allele on the
Experimental hut trial has been also carried out to evaluate the impact of same chromosome to create a permanent heterozygote. However, in An.
the mixture net on the wild free flying An.arabiensis compare to standard gambiae many Ace-1 allele copies can be found in 119S homozygotes
LNs. Anopheles exposed to unwashed Olyset Duo in cone, cylinder and and sequence analysis suggests that resistant alleles may have originated,
tunnel show higher mortality and lower blood feeding rates than to or at least spread, following gene duplication. Duplicated alleles are
the standard Olyset Net (permethrin alone). The surviving Anopheles expressed though not necessarily in direct proportion to copy number,
exposed to Olyset Duo were all sterilized. This should have impact on the and Ace-1 overexpression is linked to high-level carbamate resistance.
population size of the next generation. Initial results of this novel LN's Diagnostic assays and neutral markers show that Ace-1 119S duplicated
mixture show great potential for the control of resistant malaria vectors in resistant alleles are strongly selected and increasing in frequency. Given
Sub Sahara Africa. The full outcomes of the study will be presented. strong predictive links with carbamate and organophosphate resistance,
molecular monitoring should be a key component of programmes using
772 these insecticide classes for control of An. gambiae.
of identified campaign nets. A total of 6,832 nets were collected, though 776
not all of them were LLINs. Preliminary results suggest that net ownership,
coverage and use are highly variable between districts (household with ANALYSIS OF THE DNA SEQUENCE OF ACE.1 GENE
at least 1 net per sleeping space ranged from 29 - 66%) and by equity IN ANOPHELES GAMBIAE S.S: DUPLICATION AND
(those in lower socio-economic quintiles used nets less frequently). 27% RECOMBINATION HISTORY
of nets were reported not to have been used the night before the survey,
mainly because there were no mosquitoes, the primary user did not Luc S. Djogbénou1, John Essondoh2, Constant Edi2, Keith Steen2,
sleep at home that night and net age. The results of the bioefficacy and Benoit Assogba3, David Weetman2, Martin Donnelly2
physical degradation analysis are still outstanding, but will be presented 1
Institut Régional de Santé Publique/UAC-Liverpool School of Tropical
and correlated with net use characteristics. Increasing the data on LLIN Medicine, Cotonou, Benin, 2Liverpool School of Tropical Medicine,
durability after user conditions to understand the median lifespan of nets Liverpool, United Kingdom, 3Institut Régional de Santé Publique/UAC,
for programmatic and cost-effectiveness decisions is becoming a priority Cotonou, Benin
for the World Health Organization and NMCPs. In addition to informing Gene duplication is a source of molecular innovation throughout
the Tanzanian NMCP about the nets distributed during national campaigns evolution. However, even with massive amounts of genome sequence
between 2009 and 2011, we are also extending the ABCDR study data, correlating gene duplication with other events in natural history
prospectively to compare the durability of three LLIN products over at least can be difficult. This is especially true in its most interesting cases, where
three years. rapid and multiple duplications are likely to reflect adaptation to rapidly
changing environments and life styles. This may be so for the Anopheles
775 ace-1 gene which encodes for the neurotransmitter acetylcholinesterase,
the target of organophosphate and carbamate insecticides. Anopheles
DIRECT EVIDENCE OF CHEMICAL CONTAMINATION OF gambiae-resistant is known to possess only one mutation on the
ANOPHELES GAMBIAE S.L. BREEDING SITES UNDERLYING acetylcholinesterase (AChE) gene (ace) that is involved in insecticide
THE SELECTION OF PYRETHROID RESISTANCE IN COTTON (carbamates and organophosphate) target site insensitivity. To better
GROWING AREAS REVEALED BY GPC: POTENTIAL IMPACT understand a preferred model for the natural history of ace.1 duplication
ON THE EFFICACY OF VECTOR CONTROL TOOLS IN BURKINA in the main malaria vector, we proceeded to the cloning and sequence
FASO analysis of DNA fragment including the G119S mutation from four West
Africa countries. Here we show that phylogenetic trees produced from
Dabire K. Roch1, Hien Aristide1, Namountougou Moussa1, Soma the nucleotide sequences of 34 individual ace.1 gene consisted of 4 main
D. Dieudonne1, Combary Patrice2, Diabate Abdoulaye1 clusters, with ace.1 copies of different specimens grouping together in
Centre Muraz/IRSS, Bobo-Dioulasso, Burkina Faso, 2National Malaria three out of the four clusters as expected if there was multiple duplication
Control Programme, Ministry of Health, Ouagadougou, Burkina Faso events. Furthermore, Phylogenetic analysis displayed an individual
Since the detection of the first case of Anopheles gambiae resistance to mosquito bearing more than two different resistant haplotypes with
pyrethroid recorded in Ivory Coast in 1993, several studies had reported unexpectedly high copy number (at least six) of susceptible haplotype in
the role of agriculture in the selection and the spread of pyrethroid the same individual. Our data indicate that this high copy number in both
resistance in natural populations of An. gambiae s.l. Unfortunately no susceptible and resistant haplotype have evolved through gene duplication
direct evidence was reported enhancing the presence of such chemicals following by recombination event.
in anopheline breeding sites. It was what we addressed in the current
study performed in Dano, a cotton growing area located in the South 777
West of Burkina Faso by monitoring the insecticide content both in water
and sediments sampled from randomly selected breeding sites using EVALUATING THE EFFICACY OF ORGANOPHOSPHATE-
GC analysis from August to October 2013. The resistance status of local COMBINED PAINT AGAINST PRYRETHROID-RESISTANT
populations of An. gambiae s.l. was estimated using standard WHO tube ANOPHELES GAMBIAE S.L. IN VALLÉE DU KOU, BURKINA
assays. Early in August some herbicides as Diouron were detected from FASO
the soil residue in concentrations ranged from 22.63 to 105.5 mg/Kg of
soil without any insecticide in the water. In October two pyethroids namely Dieudonné D. Soma
lambacyalothrin and deltamethrin were found in the breeding water IRSS/Centre Muraz, Bobo-Dioulasso, Burkina Faso
at concentrations ranging from 0.0147μg/l to 1.49 μg/l together with Malaria control is currently treated by the rapid spread of insecticide and
other chemicals occurring in very low concentration from the soil residue drug resistance among mosquito and parasite respectively, and operational
(benzoypropenyl, dioxacarb, chloroneb). A reduced mortality rate was difficulties on the field. It is necessary to find alternative and innovative
observed both with deltamethrin 0.05% and bendiocarb 0.1% reaching tools for more effective malaria control. In the current study we evaluated
52.04% and 66.67% respectively. High kdr allele frequencies reaching the efficacy of organophosphate-combined paint containing insect growth
0.95 and 0.4 respectively for 1014F and 1014S alleles and 0.12 for the regulator in indoor application on the walls in Vallée du Kou where
ace-1 allele accompanied this strength resistance phenotype. Data on the Anopheles gambiae is resistant to pyrethroids. The main entomological
efficacy of long lasting insecticide treated bednets (LLINs) in use in the parameters such as mortality rates and paint insecticidal residual efficacy
region obtained by WHO cone test, showed mortality rates ranged from were compared in a village scale between treated and untreated huts. The
10% to 83% depending to the type of LLIN. The significance and the residual insecticidal efficacy of the paint tested both with the susceptible
impact of such resistance on the efficacy of malaria vector control strategy An. gambiae "Kisumu" and wild local populations of An. gambiae s.l.
in short and long terms were discussed. showed high mortality rates ranged 98 to 100% even six months after
the treatment. The indoors catches of wild An. gambiae performed during
four consecutive days per month from July to December 2013 revealed
that all mosquitoes entered in the paint-treated houses were died reaching
100% mortality rates throughout the six months collection. The frequency
of kdr-L1014F (98%) mutation which was higher in this area did not differ
between treatments. That of the Ace-1R remained low less than 5% and
did not differ whatever the treatment. These results are very promising in
terms of new perspectives to control resistant malaria vectors. Contrary
to the classic indoor sprays, this tool is very simple and does not require
any special equipment or qualified personnel. But a large-scale assay is coverage <15 or >1000 were excluded. SNPs association with resistance
required to address its impacts on malaria transmission and the perception was assessed using LOD scores. SNPs in 38 genes were associated with
and acceptability of targeted human communities. permethrin resistance; none of these belonged to the expected target site
or putative detoxification genes. Instead, we identified genes involved with
778 GTP and ATP binding, calcium ion binding, zinc ion binding, glutamate
ion channel transport and enzymes with specific activity. These candidate
INSECTICIDE RESISTANCE PROFILES IN AEDES AEGYPTI genes could become markers that will allow tracking pyrethroid resistance
STRAINS FROM THE CARIBBEAN REGION OF COSTA RICA in Ae. aegypti.
Olger Calderón-Arguedas, Adriana Troyo
Universidad de Costa Rica, San Jose, Costa Rica
Dengue is the most important vector-borne disease in Costa Rica. INSECTICIDE SUSCEPTIBILITY, CHARACTERIZATION OF
Although control of the vector, Aedes aegypti, includes repeated use BREEDING SITES AND COMMUNITY PERCEPTIONS ON
of pyrethrins and temephos, insecticide resistance is not monitored MALARIA VECTOR CONTROL INTERVENTIONS ON KNUST
continuously. In this study, resistance profiles to deltamethrin, CAMPUS
cypermethrin, and temephos were evaluated in strains of Ae. aegypti
from the cities of Guacimo and Limon in the Caribbean Region. Bioassays Ruth C. Brenyah
were carried out by exposing groups of 20 larvae for 24 hours to each Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
of the insecticides at a series of concentrations that would generate Control of malaria vectors with insecticides remains an essential
from 2% to 100% mortality. Tests were performed by quintuplicate component to fight and eliminate malaria. There have been reports of
using larvae from the second to fourth generations, and a 50% lethal insecticide resistance to all four classes of insecticides. Spread of resistance
concentration (LC50) was estimated. A 50% resistance ratio (RR50) was is said to be due to the excessive use of insecticides in Public health and in
calculated using the LC50 of the Rockefeller strain as a susceptible control. Agriculture. Insecticide-treated nets (ITN) and Indoor residual spraying (IRS)
When resistance occurred, the enzymatic mechanism was evaluated by have proven to be the two most powerful and most broadly applied vector
exposing the larvae to the synergists piperonyl butoxide (PB) and S, S, S, control interventions over the years. Despite the reports of resistance to
tributylphosphorotrithioate (DEF) and repeating the assays. No resistance pyrethroids, a lot of ITNs are still being mass distributed for free in most
to temephos or deltamethrin was detected in Ae. aegypti strains from communities in Ghana.This study seeks to find out the level of resistance in
Guacimo and Limon. Emerging resistance to cypermethrin was detected Anopheles mosquitoes, to insecticides on the University campus which has
in both Guacimo (LC50 = 0.00845 mg/L, range = 0.00664 to 0.01038 an urban ambience, to determine other chemical vector control methods
mg/L; RR50 = 6.07) and Limon (LC50 = 0.01016 mg/L, range = 0.00876 used by inhabitants and their perception on ITN use. Due to the extensive
to 0.01177 mg/L; RR50 = 7.30). The analysis of cypermethrin with PB agricultural practices on the campus, the breeding sites of the Anopheles
resulted in synergism ratios of 19.2 and 8.7 for Guacimo and Limon mosquitoes were characterized using physico-chemical parameters to find
strains, respectively. Synergism ratios for DEF were 0.9 for the Guacimo out the impact of spraying on the larvae. For the susceptibility tests, 2-5
strain and 1.8 for the Limon strain. Results show that Ae. aegypti in both days old non blood fed female Anopheles mosquitoes were tested against
areas studied are in the process of developing resistance to cypermethrin, 0.05% deltamethrin, 4% DDT, 0.1% fenitrothion and 1% bendiocarb
which is associated at least in part with the activity of cytochrome P450 using standard WHO tube assay. A well-structured questionnaire was
monooxygenase. Therefore, local authorities should begin replacement administered to residents to determine their knowledge, attitudes and
of cypermethrin to ensure effectiveness of vector control and limit the practices to malaria. A total of 3,766 mosquitoes were identified as An.
development of resistance. gambiae s.l (98.9%) and An. funestus (1.2%). Resistance was recorded
to all classes of insecticides with mortality rates of 15-54% deltamethrin,
779 10-50% bendiocarb, 7.5-38.75% DDT and 5-42.5% fenitrothion.
Overall knockdown rates was 60-21% for deltamethrin, 36.25-11.25%
USE OF NEXT GENERATION SEQUENCING (NGS) TO IDENTIFY for fenitrothion, 26.25-12.5% DDT and 55-10% for bendiocarb across
NOVEL SNPS ASSOCIATED WITH PYRETHROID RESISTANCE all breeding sites. Susceptibility status of mosquitoes indicate most are
IN AEDES AEGYPTI resistance. There was no association between susceptibility status and
physical parameters of breeding sites. Inhabitants use ITN's, aerosol
Karla L. Saavedra-Rodriguez, Patricia Penilla-Navarro, Corey
sprays, mosquito coils and repellents, impregnated curtains and screens
Rosenberg, Saul Lozano-Fuentes, Farah Vera-Maloof, William C.
on windows amongst other traditional methods; knowledge on use of
Black, IV
ITNs was adequate. Knock down resistance (kdr) genes must be assessed.
Colorado State University, Fort Collins, CO, United States Knowledge on ITN usage was not converted into practice. This study
The identification of single nucleotide polymorphisms (SNPs) associated shows the need for continuous monitoring of resistance to mosquitoes in
with insecticide resistance has being performed mainly through genomic this area to enable better control methods to be formulated and practiced.
DNA and cDNA sequencing. Several SNPs conferring insecticide
resistance have being identified in target site genes and in less extent at 781
some detoxification genes. Recent Next Generation Sequencing (NGS)
technology allows screening the whole genome to identify SNPs associated MULTI-COUNTRY PROFILE OF INSECTICIDE RESISTANCE
with insecticide resistance. In this study we identified SNPs associated ON MALARIA VECTORS IN THE PRESIDENT'S MALARIA
with pyrethroid survival in an Aedes aegypti field population collected INITIATIVE (PMI/USAID) SUPPORTED COUNTRIES UNDER THE
in Viva Caucel, Yucatan, Mexico, which already has high frequency for AFRICA INDOOR RESIDUAL SPRAYING PROJECT
pyrethroid associated mutations in para. Four genomic DNA libraries were
built following the recommended Illumina HiSeq protocols. Two replicate Aklilu Seyoum1, Dereje Dengela2, Bradford Lucas2, Allison
libraries contained DNA from mosquitoes that had survived one hour Belemvire3, Kristen George3, Christen Fornadel3
exposure to 25 µg permethrin (active ingredient per bottle). The remaining Abt Associates Inc., Accra, Ghana, 2Abt Associates Inc., Bethesda, MD,
two libraries contained DNA from mosquitoes that died from the same United States, 3United States Agency for International Development,
exposure. Sequences were obtained from an Illumina HiSeq2000/2500 Washington, DC, United States
sequencer. We constructed a reference library including the total transcript The Africa Indoor Residual Spraying project implemented indoor residual
sequences released by Vector Base. We aligned the paired read data to spraying (IRS) in twelve African countries, namely Angola, Benin, Burkina
our locally build reference library using the GSNAP software. SNPs with Faso, Ethiopia,Ghana, Liberia, Madagascar, Mali, Mozambique, Nigeria,
Rwanda and Zimbabwe withsupport from the President's Malaria Initiative 783
in 2012/2013. The project regularly collects data on susceptibility of the
malaria vectors to the four classes of insecticides approved by WHO for DENGUE VECTOR COMPETENCE STUDIES IN AEDES
IRS with the aim to guide selection of appropriate insecticides for IRS MOSQUITOES
programs. WHO tube tests were used for susceptibility tests, and most of
the tests were carried out against Anopheles gambiae s.l. (144 and 188 James Whitehorn1, Duong Thi Hue Kien2, Nguyet Minh Nguyen2,
tests in 2012, and 2013 respectively); and a total of 14 tests were also Hoa L. Nguyen1, Tran Nguyen Bich Chau2, Long Vo Thi2, Le Thi
carried out against the An. funestus in Mozambique and Zimbabwe. Data Dui2, Nguyen Tan Truong3, Luong Thi Hue Tai3, Bridget Wills2,
were entered into the database and collated to inform the decision making Chau Van Vinh Nguyen3, Marcel Wolbers2, Cameron P. Simmons2
processes. An. gambiae s.l. was found to be fully susceptible (98-100% 1
London School of Hygiene & Tropical Medicine, Ho Chi Minh City,
mortality after 1 hour exposure and 24 hrs. holding period) to pirimiphos- Vietnam, 2Oxford University Clinical Research Unit, Ho Chi Minh City,
methyl in all the sites where the tests were conducted. However, potential Vietnam, 3Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
resistance to fenithrothion was observed in sites in Benin, Ethiopia, Ghana, Dengue is globally the most important arboviral infection of humans.
Liberia, Madagascar and Mozambique. Resistance to malathion has been The main vector worldwide is Aedes aegypti. The Asian tiger mosquito,
observed in Ethiopia. Variable levels of susceptibility were reported for the Ae. albopictus, is also a competent vector of dengue viruses and its
carbamate bendiocarb against An. gambiae s.l. Resistance to pyrethroid presence in continental USA and southern Europe raises the concern that
insecticides is widespread for An. gambiae s.l. in most countries.However, dengue will spread further into new regions. This study aimed to directly
in Angola, Mozambique, Madagascar and Zimbabwe, An. gambiae s.l. compare the susceptibility of Ae aegypti and Ae albopictus to dengue by
is susceptible to deltamethrin for most sites. A high level of resistance to conducting blood feeding experiments on viremic dengue patients. This
DDT (0-26% mortality after 1 hour exposure and 24 hrs. holding period) study directly compared the susceptibility of these two mosquito types by
has been reported in most countries, except Zimbabwe, Mozambique, and conducting blood feeding experiments on 118 viremic dengue patients on
in some areas of Madagascar. An. funestus was resistant to pyrethroids in 232 independent exposure events. The likelihood of saliva infection (and
Zimbabwe and in some sites of Mozambique. It was,however, susceptible thus potential infectiousness) in Ae. albopictus was approximately half
to organochlorine and organophosphate insecticides in the southern parts that in Ae. aegypti (OR=0.49; CI: 0.34-0.70). When stratifying by serotype,
of Africa. The results are discussed in the context of malaria vector control the odds of saliva infection were significantly lower for Ae. albopictus
interventions, geographical locations and epidemiology of malaria in the with DENV-2, DENV-3 and DENV-4 , but not with DENV-1. We have
countries. demonstrated that disseminated DENV infections and thus transmission
are less likely to occur in Ae. albopictus than Ae. aegypti. These results
782 have implications for understanding the spread, distribution and control of
Diana Hamer1, Helene Hiwat2, Maureen Lichtveld1
Tulane University School of Public Health and Tropical Medicine,
New Orleans, LA, United States, 2Bureau of Public Health Suriname, Lauren B. Carrington1, Nguyet M. Nguyen1, Hue Tai T. Luong2,
Paramaribo, Suriname James Whitehorn1, Cameron P. Simmons1
The primary vector of the dengue virus, Aedes aegypti, is well established Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam,
in the increasingly urbanized capital of Paramaribo, Suriname. Due to Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam
the complex interaction of the environment and the mosquito, dengue Among other cues, host-seeking mosquitoes are known to be responsive
transmission risk differ within the geographic area of concern. This study to carbon dioxide and body temperature. Due to a higher body
characterizes dengue-related entomological and environmental factors temperature, dengue virus-infected patients, like other febrile patients,
affecting disease transmission. Previously, high and low epidemiological may be more attractive to Aedes aegypti mosquitoes compared to healthy
rate clusters of dengue were identified in Paramaribo. Within the clusters, individuals. That is, the clinical effects of dengue may aid its transmission
houses were randomly selected for inspection before and after the short to further susceptible mosquitoes. An altered distribution of mosquito
rainy season. An environmental survey was conducted and entomological bites between infectious and non-infectious hosts may impact predictions
indices were calculated for each cluster. Presence of larva and pupae were of transmission dynamics during epidemic periods with a high force of
recorded and samples of pupae were collected during the surveys. All infection. We test the hypothesis, H0 = both febrile and afebrile hosts
inspected locations were geospatially coded. In total, 536 houses were are similarly attractive to naïve Ae. aegypti mosquitoes, by exposing
surveyed in Paramaribo: 242 during the pre-rainy season and 294 post- febrile dengue patients and healthy matched volunteers to uninfected
rainy season. The findings show significant difference between pupae- Ae. aegypti mosquitoes. We released five Ae. aegypti into the center of
positive houses and pupae-positive containers (house & container index) a large cage (~4m x 2m2), with the participants at each end. The time
pre- (37.60% & 16.53%) and post- (24.83% & 7.73%) rainy season, it takes for each participant to be first chosen, and landed upon by a
p=0.001 and p=0.033. The Breteau indices pre- and post- rainy season mosquito, is measured, with mosquito landing used as a surrogate for
were 0.68 v. 0.27. These pupae indices were higher in the low cluster biting. Anticipated completion of enrollment will occur in December
pre-rainy season but higher in the high cluster post-rainy season. The 2014. Results from this study will inform us whether dengue virus has
dispersion index remained unchanged between the seasons (3.99 and the capacity to enhance its own transmission (whether it be directly or
3.70 for pre- and post-rainy season, respectively) but decreased from 5.10 indirectly) by increasing the attractiveness of infected human hosts to naïve
to 3.81 in the high cluster and increased from 2.95 to 3.16 in the low mosquitoes.
epidemiological cluster between the rainy seasons. The variation in the
dispersion index indicates that factors within clusters and seasonality affect
the proportions in which pupae are present among different categories of
containers. This is the first attempt to demonstrate how entomological and
environmental data influence the rate of dengue transmission in Suriname.
785 large cage or field trials. Ongoing studies are focused on testing transgenic
mosquito resistance to the P. vivax parasite, O'nyong'nyong virus and the
DO SEASONAL TEMPERATURES MATTER IN THE LARVAL filarial worm Brugia malayi.
Katie Westby, Steven A. Juliano BOAT TRAFFIC IN THE PERUVIAN AMAZON
Illinois State University, Normal, IL, United States
Sarah Anne Guagliardo1, Yoosook Lee2, Jacklyn Wong3, Yui Yin
Mathematical models of mosquito transmitted diseases suggest that Chu4, Helvio Astete5, Gonzalo Vazquez-Prokopec1, Thomas W.
female longevity is an important factor for determining disease risk. As Scott6, Uriel Kitron1, Steven T. Stoddard6
ectothermic organisms, temperature regulates mosquito growth and 1
Emory University, Atlanta, GA, United States, 2University of California
development. It is well understood that bellow a critical maximum, hotter
Davis School of Veterinary Medicine, Davis, CA, United States, 3Centers
temperatures decrease development time and adult size. Adult size is
for Disease Control and Prevention, Atlanta, GA, United States, 4Stanford
correlated with fecundity, but it is less well understood how size is related
School of Medicine, Palo Alto, CA, United States, 5U.S. Naval Medical
to longevity and how temperatures experienced in the larval habitat
Research Unit - 6, Iquitos, Peru, 6University of California Davis, Davis, CA,
influence adult longevity. Additionally, most experimental studies that
United States
have tested effects of temperature use constant temperatures and ignore
daily or seasonal temperature fluctuations that mosquitoes encounter In the Americas, as in much of the rest of the world, the dengue vector
under natural conditions. I simulated fluctuating daily temperature and Aedes aegypti is predominantly found in urban areas. Its presence in rural
photoperiods consistent with those experienced in St. Louis, MO in June areas is more limited, and the factors favoring its potential geographic
and August to test the hypotheses that 1) Aedes triseriatus mosquito expansion to rural and smaller urbanized settings are poorly understood.
larvae developing under different seasonal conditions will differ in size In the Peruvian Amazon, this vector has been expanding its range
and adult longevity 2) that fluctuating temperatures yield adults that into rural communities over the last 5-10 years. Understanding Ae.
differ in size and adult longevity from those produced in stable conditions. aegypti dispersal patterns is important for anticipating the future range
There was no effect of size on female longevity. Despite early differences expansion of dengue and other viruses transmitted by this mosquito.
in survival probability and different ages at senescence, there was no To examine if human transportation networks play a significant role in
statistically significant difference between August and June treatments. the population expansion of this mosquito, we analyzed Ae. aegypti
The August treatment was significantly different from the constant population structure using a panel of 10 microsatellite markers. Adult
temperature control, which experienced reduced longevity. Simulated and immature Ae. aegypti (>20 individuals per site) were collected from
August, June, and constant treatments also differed in larval survivorship, the city of Iquitos (pop: 380,000) and several neighboring communities
median day to eclosion, size, and r' (a cohort performance index). The that are connected by river transport, including Nauta (pop: 14,000),
June and constant treatments only differed in female size. These results Indiana-Mazan (pop: 7,000), Barrio Florida (pop: 750), Tamshiaco (pop:
suggest seasonal temperature fluctuations in the larval habitat do not 4,500), and Aucayo (pop: 800). We detected significant departures from
affect adult longevity in Ae. triseriatus, but do affect other measures of Hardy-Weinberg Equilibrium in all study sites due to lower than expected
performance typically reported in studies that investigate down- stream number of heterozygotes. FST statistics show significant differentiation
effects of the larval habitat. for the majority of study site pairs. Population structure among Ae.
aegypti in different towns is not correlated with the geographic distance
between towns, suggesting that human transportation networks may be
786 responsible. Furthermore, Ae. aegypti gene flow among sub-populations
TRANSGENIC ANOPHELES STEPHENSI FITNESS AND is greatest between locations with heavy boat traffic such as Iquitos-Nauta
SUSCEPTIBILITY TO VARIOUS INFECTIONS (which also has heavy road traffic) and Iquitos-Indiana-Mazan, and lowest
between locations with little or no boat (or road) traffic such as Barrio
Andrew Pike, George Dimopoulos Florida-Iquitos interior. Bayesian clustering analysis using Structure program
Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United suggested definite admixture, with 5-6 genetic clusters. Our results provide
States strong evidence for the hypothesis, especially via boats, is responsible for
Various mosquitoes from the genus Anopheles spread the causative agents Ae. aegypti spread in the Peruvian Amazon.
of human malaria. Traditional malaria control efforts have been unable to
eliminate the disease, mainly because of insecticide and drug resistance 788
arising among both the mosquitoes and the Plasmodium spp. parasites
that cause the disease. Therefore, new tools to combat the disease are
needed, and one potential new technology to limit malaria transmission is INFRARED SPECTROSCOPY (NIRS) TO DETERMINE THE AGE
the use of transgenic mosquitoes refractory to malaria infection. Multiple OF FEMALE AEDES AEGYPTI MOSQUITOES WITH VARYING
laboratories have created multiple mosquito lines that do not transmit LARVAL AND ADULT DIETS
the malaria parasite, but have not yet reached the stage of releasing such
Kelly Liebman1, Isabel Swamidoss1, Lucrecia Vizcaino1, Audrey
mosquitoes, partly due to concerns about their fitness relative to wild-type
Lenhart1, Floyd Dowell2, Robert Wirtz1
conspecifics and their ability to resist a broad range of malaria parasites
and other human pathogens. We studied various aspects of mosquito
Centers for Disease Control and Prevention, Atlanta, GA, United States,
fitness in five separate transgenic lines representing different transgenes,
United States Department of Agrictulture, Manhattan, KS, United States
insertion points and promoters in order to determine the fitness costs that Interventions targeting adult mosquitoes are often used to combat the
may arise due to transgenesis. Of the five lines tested, four have shown transmission of vector-borne diseases, including dengue. In the absence
no fitness cost and the fifth has some fitness reduction due to position of a vaccine, we rely on control measures targeting the primary dengue
effects. We also challenged our mosquitoes with different P. falciparum vector, Aedes aegypti, to prevent transmission. Due to the 7 day extrinsic
strains. Our results indicate that the mosquitoes are highly resistant to incubation period of the virus in the mosquito, older mosquitoes (>7
infection by multiple P. falciparum strains and do not suffer a large fitness days)are of most concern in the dengue transmission cycle. Identifying
cost as a result of transgenesis, thereby illustrating their potential utility as the age of female mosquitoes is therefore a crucial step in determining if
part of a larger malaria control program and warranting further testing in vector control interventions are altering the age structure of the mosquito
population, thereby reducing transmission potential. We have developed
a model using near infrared spectroscopy (NIRS) to determine the age of 790
adult female Ae. aegypti. This technique quantitatively measures organic
compounds, and has previously been used successfully to age-grade other HUMAN IGG ANTIBODY RESPONSE AGAINST RECOMBINANT
mosquito species. To determine if the larval and/or adult diet of female AEDES AEGYPTI SALIVARY PROTEINS MODIFIED DURING
Ae. aegypti affects the ability of NIRS models to predict mosquito age, 2 DENV2 INFECTION
groups of mosquito larvae were raised in identical settings and fed either
fish food or infant cereal. Emerged adult females were separated and fed Berlin L. Londono-Renteria1, Michael K. McCracken1, Daniel
either blood or sugar, resulting in four experimental groups. These adult M. Chisenhall1, Jenny C. Cardenas2, Miguel A. Sanabria2, Lucio D.
females were then killed 1, 4, 7, 10, 13 or 16 days post-emergence. The Cardenas3, Omar G. Perez3, Christopher N. Mores1
head and thorax of each mosquito were scanned using a LabSpec 5000. 1
Louisiana State University, Baton Rouge, LA, United States, 2Hospital
The spectral scans from each group were analyzed independently and Local Los Patios, Los Patios-Norte de Santander, Colombia, 3Universidad de
collectively, to determine if the diet of the mosquito affected the spectrum. Pamplona, Pamplona-Norte de Santander, Colombia
Multiple models were developed using GRAMS PLSPlus/IQ, with different Arthropod saliva has been shown to modulate the success of infection
spectral ranges. The best model included all experimental groups, and success for the microorganisms they transmit. Our group has found
was able to positively predict the age group (< or ≥7 days) of 88.8% of that DENV infection of Ae. aegypti salivary gland induces changes in
mosquitoes. Models using a single experimental group to predict the the expectorated salivary content. We have produced by recombinant
others were less robust. These results indicate both larval and adult diet technology three of the proteins we found to be reduced in saliva. The
affect the predictive ability of models developed using the spectral scans immunogenicity against these proteins was evaluated in subjects from a
of female Ae. aegypti. This potentially complicates the application of NIRS DENV endemic area in Colombia by ELISA. We found a significant increase
age grading to field populations, as larval and adult nutrition can vary in the IgG antibody levels after exposure to mosquito bites. We also found
greatly in the field. a differential antibody response among healthy, febrile DENV (-) and DENV
(+) subjects. We hypothesize that the decrease of these proteins in saliva
may be advantageous to the virus. Differential IgG response between
789 DENV (+) and negative subjects suggests 1) dengue positive subjects are
SPECIES DIVERSITY, SEASONAL, AND SPATIAL DISTRIBUTION significantly at higher exposure/risk to mosquito bites 2) the immune
OF MOSQUITOES (DIPTERA: CULICIDAE) CAPTURED IN response against these proteins may play an important role in disease
AOTUS MONKEY-BAITED TRAPS IN A FORESTED SITE NEAR progression.
Michael J. Turell1, Elizabeth S. Andrews1, Alfonso Gonzalo2,
Faustino Carbajal3, Victor Lopez-Sifuentes4, George B. Schoeller5 ALTERNATIVE MOSQUITO SAMPLING TO MONITOR
United States Army Medical Research Institute for Infectious Diseases, LYMPHATIC FILARIASIS TRANSMISSION IN PAPUA NEW
Fort Detrick, MD, United States, 2Comparative Medicine Branch, Bethesda, GUINEA
MD, United States, 3Unidad de Vigilancia y Control de Artrópodos y
Daniel J. Tisch1, Naomi Vincent2, John Keven2, Lisa Reimer3,
Reservorios, Minsa, Peru, 4Department of Entomology, Callao, Peru, 5U.S.
Edward D. Walker4, Peter Siba5, James W. Kazura1, Peter A.
Navy Bureau of Medicine and Surgery, Falls Church, VA, United States
This study was conducted to determine the relative abundance, diversity, 1
Case Western Reserve University, Cleveland, OH, United States, 2Papua
seasonal, and vertical distributions of potential mosquito vectors in
New Guinea Institute for Medical Research, Madang, Papua New Guinea,
the Amazon Basin, Peru. A total of 66,097 mosquitoes (50 mosquito 3
Liverpool School of Tropical Medicine, Liverpool, United Kingdom,
species from 12 genera) were collected from May 2001 through March 4
Michigan State University, East Lansing, MI, United States, 5Papua New
2002 at a forested site near Iquitos, Peru. Mosquitoes were collected
Guinea Institute for Medical Research, Goroka, Papua New Guinea
using Aotus nancymae Hershkovitz monkey-baited CDC light traps
set for 12-h day and night periods at varying heights (e.g. ground and Entomological markers of lymphatic filariasis (LF) transmission provide key
canopy) in the forest. Of the 12 genera, three accounted for 75% of all information regarding progress toward LF elimination and subsequent
mosquitoes collected: Culex (33%), Aedes (23%) and Psorophora (18%). monitoring. However, "gold standard" approaches of human landing
The most prevalent species collected were Aedes serratus (Theobald), catches (HLC) can be inefficient and expensive as transmission approaches
Culex pedroi Sirivanakarn & Belkin, Psorophora albigenu (Peryassu), and zero. In addition, HLC can be complicated by and/or violate cultural and
a combination of Mansonia indubitans Dyar & Shannon and Mansonia ethical standards. Recently barrier screens have been used with success
titillans (Walker), which accounted for 56% of all mosquitoes captured. in the Pacific region to estimate human blood index and quantify malaria
In general, mosquitoes were collected more often at night and on the transmission in anopheline mosquitoes. Since Wuchereria bancrofti (Wb)
ground. Exceptions include Coquillettidia venezuelensis (Theobald), which is exclusively transmitted by anopheline vectors in Papua New Guinea,
were collected in relatively even numbers at both day and night and most this study compares HLC, light traps, and barrier screens with regard
Mansonia and some species of Anopheles, which were collected more to mosquito species captured, anopheline infectivity (as detected by
often in the canopy. Total mosquito populations had two peaks, June- microscopy for stage 3 Wb larvae), and presence of Wb DNA. 2mx40m
July (Ma. indubitans/titillans, Cq. venezuelensis) and December-January barrier screens were sampled every 15 minutes by trained collectors in
(Ps. albigenu, Cx. pedroi, Ae. serratus). Observations of the eight most communities with simultaneous HLC collections (plus light traps in one
collected mosquitoes indicated that behavioral shifts were not observed sampling week). Collections occurred between 6pm and 6am in four
between collection months. These data provide a better understanding communities for one week in November 2013, March 2014, and July
of the species diversity, population density and seasonal distribution of 2014. Mosquitoes were separated according to hour captured, capture
potential mosquito vectors within the Amazon Basin region and allow for method, and the side of the screen collected (village side vs. bush side).
the development of appropriate vector and disease prevention strategies. Anopheline capture density and composition will be compared for each
mosquito sampling method. Xenomonitoring for LF elimination will be
quantified by both microscopy of anopheline mosquitos and PCR for Wb
DNA in all bloodfed mosquitoes. Human blood index and presence of Wb
DNA will be compared across the study communities. Negative binomial
models will be fit to compare agreement between mosquito capture
methods for mosquito species densities and presence of L3. The results most prevalent in pools from the three cities (75.5%), followed by DENV-3
are relevant to the selection of the most efficient mosquito collection (28.8%), DENV-1 (6.6%) and DENV-2 (2.2%). Our results differ from those
techniques for xenomonitoring LF during elimination programs in PNG. of dengue serotype presence in humans from the whole country reported
by the Colombian National Institute of Health, where DENV-1 is the most
792 prevalent and DENV-4 the least. This suggests that human populations are
more refractory to DENV-4 infection, the most abundant serotyp