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Hard Ticks on Domestic Ruminants and their Seasonal Population Dynamics in Yazd Province, Iran.

Background: Ticks are the main vectors for transmission of different pathogens to human and animals. This survey was performed to find out distribution of ticks, which infested the domestic ruminants in Yazd Province, central Iran during year 2008–2009. Methods: A total number of 30 villages from both mountainous (20%) and plateau (80%) regions of the province were selected randomly. Ticks were colleted from the body of infested animals and transported to the laboratory of Medical Entomology, School of Public Health, Tehran University of Medical Sciences and then were identified to space level using valid identification key. Results: A total of 583 hard ticks were collected. The ticks were classified into three genera and 7 species including: Hyalomma dromedarii (55.92%), Hy. marginatum (13.20%), Hy. anatolicum (9.78%), Hy. detritum (4.98%), Hy. asiaticum (3.94%), Rhipicephalus sanguineus (11.84%), and Dermacentor marginatus (0.34%). The highest seasonal activities occurred in summer. The prevalence of the Ixodidae ticks was more evident in plateaus area in Yazd Province. Among the hosts including: cow, goat, sheep and camel, the ticks that collected from camel was more prevalent. The ratio of male was more than female ticks. Hyalomma. dromedarii was the predominant tick species and accounted for 55.92% of the ticks. Conclusion: Some of the collected ticks may play an important role for transmission of vector borne disease to human; therefore, the results of this study will provide a clue for vectors of tick-borne diseases in the region for local authorities for implementation of disease control.


Introduction
There are several works on biology, distribution and systematics of hard and soft ticks in Iran. (Brumpt 1935, Deply 1936, 1938, Baltazard et al. 1952, Abbassian-Lintzen 1960, Maghami 1968, Mazlumi 1968, Janbakhsh and Ardelan 1970, Filopova et al. 1976, Robinson and Spradling 2006, Aghighi et al. 2007, Telmadarraiy et al. 2007). Ixodid ticks are parasitizing wild as well as domestic animals such as sheep and goat in Iran and maintaining natural foci of many hazardous diseases for human (Hoogstraal andWassef 1979, Hoogstraal andValdez 1980). Ecological aspects of various species of ticks encountering domestic animals in North West of Iran also reported (Rahbari 1995). The distribution of soft ticks, Argasidae, from human dwellings, poultries, and animal shelters in Hamadan Province was reported (Vatandoost et al. 2003). Fauna of hard and soft ticks (Families: Ixodidae and Argasidae) in West Azerbaijan Province highlighted (Telmadarraiy et al. 2004). There are also some reports on distribution of tick fauna in Iran Rahbari 2008, Rahbari et 67 al. 2008). Seasonal activity of ticks and their importance in tick-borne infectious diseases in West Azerbaijan has been reported (Salari Lak et al. 2008). Different species of ticks play important role for transmission of the disease through the country. Tick-borne relapsing fever is an acute febrile and endemic disease in Iran. During 1997-2006, a total of 1415 cases have been reported from the entire country (Arshi et al. 2002, Masumi Asl et al. 2009). Crimean-Congo haemorrhagic fever (CCHF) is a viral haemorrhagic fever also considered as a public health problem in Iran. The virus is found in the cattle and ticks (Telmadarraiy et al. 2010).
The objective of this study was to determine the species and distribution of ticks infesting domestic ruminants in Yazd Province of Iran.

Study area
Yazd is located in center of Iran. In the study area the total numbers of 30 villages were selected randomly and survey was conducted in these villages.

Tick collection
Tick collections were carried out on domestic ruminants. Ticks were collected from sheep, cow, goat, and camel. The collected specimens were transferred into the holding tubes and counted, then were identified by morphological characteristics using the key identification guide of Kaiser and Hoogstraal (1963).

Results
A total of 583 ticks were collected from 30 villages. They were collected from, sheep, goat, cattle, and camel. All of the ticks belonged to the family Ixodidae. The identified tick specimens belonged to seven species, including three genera of Hyalomma, Dermacentor and Rhipicephalus. From which 82.84% comprise the Hylaomma species. Hylaomma dromedarii was the most abundant of the total ticks. Dynamic of population of tick revealed that they were more prevalent during summer and spring. The figure of density and activity of ticks in winter were low, i.e.; 12.69% of the total ticks collected ( Table 1). The occurrence of hard ticks was more noticeable in plateau area (Table 2). Table 3 shows frequency of different hard ticks' species on various hosts. The camel was found the most appropriate host for ticks. The relative frequencies of sex of the tick were 57% male and 34% female.

Discussion
The findings of the current study show the occurrence of seven species of hard ticks in Yazd Province. The population frequencies of the species of genus Hyalomma were higher than the others. Hylaomma. dromedarii was the most frequent species. The host preference of main hard ticks was camel, sheep, cow, and goat, respectively. Sex ratio of ticks were 57% male and remaining female. The occurrence of hard ticks was more noticeable in plateaus and this attributed the geographical condition of Yazd Province which is located in the plateau. The hard ticks were more prevalent during summer and spring respectively. In parallel to our study, results of tick fauna in Lorestan Province revealed that genera Hylaomma, was active during the summer (Tavakoli 1997 Hy. marginatum, Hy. anatolicum, Hy. detritum, Hy. dromedarii, Hy. asiaticum, Hy. schulzei, H. aegyptium, Rh. bursa, Rh. sangiuneus, D. marginatus, B. annulatus, Ornithodoros lahorensis, and Argas persicus. Frequency of ticks during different seasons was different (Salari Lak et al. 2008). Results of Meshkinshahr district reported the most frequency of the genera Hyalomma and Rhipicephalus, the seasonal activity of ticks was in spring and summer ). Ticks collected from sheep in Abdanan Township also confirm the high prevalence of genus Hyalomma (Nasiri et al. 2009). In Ethiopia, camel were infested with Hy. dromedarii (Zeleke and Bekele 2004). Nabian et al. (2009) found seven Hyalomma species on goat, sheep, cattle and camels in different zoogeographical zones of Iran including: Hy. anatolicum, Hy. excavatum, Hy. asiaticum, Hy. marginatum, Hy. detritum, H. schulzei and Hy. dromedarii. The geographical distribution and ecological preferences of Haemaphysalis in domestic animals in Iran were studied ). They found seven species of Haemaphysalis on cattle, sheep and goats.
Based on our findings, it is concluded that Hy. dromedarii and Hy. marginatum are dominant ticks species in this area and camel was the most suitable host.
The species of Hy. dromedarii distributed from North Africa to the south as far as Senegal, Mali, Chad, Sudan, and Kenya; Canary Islands. Turkey (eastern), Palestine, Syria, Iraq, Saudi Arabia, Yemen, Oman, Armenia, Azerbaijan, Iran, Afghanistan, Pakistan, Kirghizia (Fergana Valley), Uzbekistan, Turkmenistan, Tajikistan, India, and China (Xingjian) (Hoogstraal 1956). Adults parasitize livestock, preferring camels. Life cycle of this tick can be one-host, two-host, or three-host. Immature ticks feed on small or large mammals, dependant upon life-cycle.