Title: Usutu Virus potential vectors and their diversity in Iran: A neglected emerging Arbovirus

Abstract

Introduction: Usutu Virus (USUV) is a vector-borne flavivirus within the family of Flaviviridae; its reservoirs and vectors are birds and mosquitoes,respectively. Methods: At first, electronic databases were searched with a date range from 2000 to 2018 to find the Culexspecies that transmit the disease and then fordetermining the diversity of those, mosquito larvae were collected from six places in three main environmental categories using the dippingtechnique. Results: In total, 1369 specimens belonging to 10 different species were collected and identified, as follows: Cx. hortensisFicalbi, Cx. laticinctusEdwards,Cx. mimeticusNoe, Cx. perxigusTheobald, Cx. pipiensLinnaeus, Cx. modestusFicalbi, Cx. sinaiticusKirkpatrick, Cx. theileriTheobald Cx.torrentiumMartini and Cx. tritaeniorhynchusGiles. Four species involved as vectors of USUV in other countries are printed in bold. Cx.pipiens, as the main vector was the most frequent species in rural areas, share its larval habitats with Cx. torrentium(similarity > 0.9) and reached its peak inAugust. Overall, in the present study, there was a significant positive relationship between mean temperatures and abundance of mosquitoes (r =0.75, P = 0.005). Conclusion: In the present study, some species involved as main vectors of USUV in other countries and their ecological features were recorded. Based on these results, the possibility of the emergence of USUV in Iran exists.