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Systematic screening of pulmonary tuberculosis among HIV high risk groups in two districts of Chhattisgarh: a feasibility study

Tuberculosis is one of the most ancient diseases caused by Mycobacterium tuberculosis discovered by Sir Robert Koch. Acquisition of infection can be prevented by effective chemotherapy by 90% within 48 hrs. India accounts for about a quarter of the global TB burden. Worldwide India is the country with the highest burden of both TB and MDR TB. There are an estimated 79,000 multi-drug resistant TB patients among the notified cases of pulmonary TB each year. India is also the country with the second highest number (after South Africa) of estimated HIV associated TB cases. In 2016 an estimated 28 lakh cases occurred and 4.5 lakh people died due to TB. The estimated mortality due to TB is 480,000 (CI: 380000-590,000) and varies across different parts in the country depending upon background HIV prevalence in the general population. Approximately 5% of the incident. ABSTRACT


INTRODUCTION
Tuberculosis is one of the most ancient diseases caused by Mycobacterium tuberculosis discovered by Sir Robert Koch. 1 Acquisition of infection can be prevented by effective chemotherapy by 90% within 48 hrs. 2 India accounts for about a quarter of the global TB burden. Worldwide India is the country with the highest burden of both TB and MDR TB. 3 There are an estimated 79,000 multi-drug resistant TB patients among the notified cases of pulmonary TB each year. India is also the country with the second highest number (after South Africa) of estimated HIV associated TB cases. In 2016 an estimated 28 lakh cases occurred and 4.5 lakh people died due to TB. 3 The estimated mortality due to TB is 480,000 (CI: 380000-590,000) and varies across different parts in the country depending upon background HIV prevalence in the general population. Approximately 5% of the incident. 4 In Chhattisgarh, the Revised National Tuberculosis Control Programme (RNTCP) was launched in 4 districts in 2002 which was then expanded in a phase wise manner to other districts. State successfully implemented national framework for joint TB-HIV collaborative activities from the year 2012 onwards.
The interaction between TB and HIV presents an additional challenge to TB control. HIV is an important risk factor for development of Tuberculosis disease. People living with HIV are 21-34 times more likely to develop TB than the HIV uninfected. 1 According to the WHO document recommendation, Intensive case finding (ICF) which involves regularly screening all people of high risk groups for HIV infection like Female sex workers (FSW), man having sex with man (MSM), Intravenous drug users (IDUs), prisons, military barracks for the symptoms and signs of TB, followed by prompt diagnosis and treatment, being of the most efficient approach for detecting more cases and with shortened duration of infectivity as it involves systematic screening of pulmonary TB in settings where high risk groups are concentrated. 4 Lack of proper screening strategy for tuberculosis for high risk groups (i.e.; FSW, MSM, IDUs) along with compromised immunity may results in tuberculosis infection progressing to the disease.
Case detection of tuberculosis in high risk group of HIVs is one step further in active case finding of TB. The undiagnosed cases in these high-risk groups could be lethal without early diagnosis and timely treatment will help in identifying the TB cases even before the HIV infection diagnosis. Various risk factors of TB infection like overcrowding, low immunity due to lack of good nutrition as well as poor health seeking behavior etc are supposedly present in the high-risk groups. So, screening of TB cases even before diagnosis of HIV infection might enhance the case detection.
The objectives of this study were-(a) to know compliance among study participants to take part in the study; (b) to know the associated clinic-behavioral factor associated with HIV high risk group; (c) to find out the proportion HRGs were presumptive pulmonary TB cases; and (d) to find out pulmonary TB cases out of presumptive cases after sputum samples subjected to GeneXpert®MTB/RIF.

METHODS
A cross sectional study was planned in two districts (i.e.; Raipur and Durg) of Chhattisgarh spanning from September to December 2019 in department of community medicine Pt. JNM Medical College, Raipur. Study participants were HIV high risk groups (i.e.; Commercial sex workers, MSMs, TGs and IDUs) were included in this study.

Inclusion criteria
All the high-risk groups (i.e.; Commercial sex workers, MSMs, TGs and IDUs) registered at the selected TI NGO were included.

Exclusion criteria
High risk groups already diagnosed of HIV infection (PLHIVs) were excluded.
In study area there were 4 targeted intervention projects running through NGOs. High risk groups were screened by trained survey team off TI NGO through systematic screening technique under RNTCP guidelines meant for active case finding technique. Training cum sensitization was organized for peer educators, outreach workers, counselors, project managers prior to the survey.
In this training, peer educators, outreach workers, counselors, project managers were trained for systematic screening of pulmonary TB (i.e.; four cardinal symptoms of pulmonary TB, cough of any duration, weight loss, loss of appetite, evening rise of temperature) should be considered as presumptive pulmonary TB.
They were also trained for sputum collection and transportation to GeneXpert®MTB/RIF lab for testing at nearest public health facility. Written informed consent was obtained before data collection. 10% data were verified at field level for its correctness and completeness by PI, PO TSU and program managers of respective TI NGOs.
Tobacco use was observed in 36.1% HRGs, of them 5.3% were using both smoke and smokeless form of tobacco whereas 62% were addicted (consuming daily) for the same. Alcohol use was observed in 42.2% HRGs, and 7.2% were addicted (consuming daily) for the same.
Out of all HRGs screened (3418), 81 (2.4%) were found presumptive pulmonary TB, only 2 (.05%) were microbiologically confirmed (both cases were in IDUs), 5 cases were found with incomplete treatment (IDUs). Prevalence of diabetes and hypertension was observed in 1.2% and 1.1 respectively on the other hand 63.8% and 66.6% didn't their status for the same.        The double burden of diabetes mellitus (DM) and TB has attracted increasing attention as screening for TB using regular chest X-ray examinations is feasible by regular follow up one may ensure active case finding in these population. 13 In our study this monitoring could be possible in 1.2% study population with diabetes mellitus. Along with food insecurity substance abuse and noncommunicable diseases are also evidenced in the current research might contribute as risk factor for the development of TB disease.

CONCLUSION
Although the yield for pulmonary TB in this study was not much but this study has demonstrated that the acceptability and feasibility to access a hidden population through existing manpower in resource poor settings can still assure active case finding in this highly vulnerable group. Malnutrition was quite high among HRGs. Substance abuse (e.g. tobacco and alcohol) was also significantly prevalent among HRGs, of them few were addicted too. The prevalence of diabetes and Hypertension was low but majority of them were ignorant of their status for the same.

Recommendations
The strategy of accessibility of high risk group by their care provider needs to be implemented in other districts as well for systematic screening and ICF of pulmonary TB, especially for among IDUs as a significant proportion such case were remain undetected among them. Hence for this IDUs should be kept under periodic surveillance for pulmonary TB. This can be achieved by periodic training and sensitization of care providers of HRGs to achieve the larger objectives of National Tuberculosis Elimination program through accessing these hidden population.