Tehran University of Medical Sciences Journal of Arthropod-Borne Diseases 2322-1984 13 3 2019 08 03 268 283 Nayyereh Choubdar Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Mohammad Ali Oshaghi Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Javad Rafinejad Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Mohammad Reza Pourmand Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Naseh Maleki-Ravasan Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran Mostafa Salehi-Vaziri Department of Arboviruses and Viral Hemorrhagic Fevers, Pasteur Institute of Iran, Tehran, Iran Zakkyeh Telmadarraiy Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Fateh Karimian Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Mona Koosha Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Abbas Rahimi-Foroushani Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Safdar Masoomi Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Kourosh Arzamani Vector-Borne Diseases Research Center, North Khorasan University of Medical Sciences, Bojnurd, Iran Jalil Nejati Department of Public Health, School of Public Health, Zahedan Unversity of Medical Sciences, Zahedan, Iran Mohsen Karami Department of Parasitology, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran Ehsan Mozaffari Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Yaser Salim-Abadi Department of Health Services and Health Promotion, School of Public Health, Rafsanjan University of Medical Sciences, Rafsanjan, Iran Eslam Moradi-Asl Department of Public Health, School of Public Health, Ardabil University of Medical Sciences, Ardabil, Iran Behrooz Taghilou Zanjan Health Center, Zanjan University of Medical Sciences, Zanjan, Iran Manouchehr Shirani Mamasani Health Center, Shiraz University of Medical Sciences, Shiraz, Iran 2019 09 25 Background: The impact of environmental factors and host on Hyalomma spp. community structure and abundance in the main Crimean-Congo haemorrhagic fever (CCHF) foci of Iran is largely unknown. Methods: Biotic and abiotic factors, including host, temperature, humidity, altitude, Köppen-Geiger climate types, sea­son, and precipitation on Hyalomma spp. community structure and abundances in 11 provinces of Iran were investigat­ed. Additionally, the possible infection of ticks with CCHF virus was evaluated using reverse transcription PCR tech­nique. Results: Species analyses demonstrated the presence of Hyalomma anatolicum, H. marginatum, H. dromedarii, H. asi­aticum, H. detritum and H. schulzei in the study area. Hyalomma anatolicum was the dominant species in the southern and northern parts, whereas H. dromedarii was distributed mostly in central parts of the country. The highest tick infestation was recognized in hot season. Spatial variation in tick relative density was observed between habitat types where more ticks were collected in deserts, semi-deserts, and Mediterranean habitats. Except for H. dromedarii, which was more preva­lent on camel (P= 0.044), there were no significant variations in the frequencies of other Hyalomma species on different hosts. Hyalomma anatolicum, H. dromedarii frequencies had significant positive and negative asso­ciation with tempera­ture and precipitation respectively. Also humidity has positive impact on H. asiaticum frequency. Conclusion: Data presented here will help improve ecological models to forecast the distribution of Hyalomma spp. ticks, to evaluate the risk of CCHF and other tick-borne diseases, and to design proper vector control measures to sup­press Hyalomma populations in Iran. https://jad.tums.ac.ir/index.php/jad/article/view/1176 https://jad.tums.ac.ir/index.php/jad/article/download/1176/462