Preliminary investigation on vectors of mosquito-borne diseases in Yiwu,Zhejiang
Objective To identify the major vectors of mosquito-borne diseases and their geographic distribution after the outbreak of dengue fever(DF) in Yiwu,providing basis for further prevention and control.Methods Light traps and dippers were used to collect mosquito adults and larvae,respectively,based on random sampling.Results At least 8 species in 4 genera belonging to 2 subfamilies were found in the region.Culex pipiens pollens coquillett was the dominant species found in 234 villages and 13 towns.Although there were few Aedes albopictus(Skuse) and other species collected from the traps,it was the only vector of DF in Yiwu that distributed in 10 towns and 18 villages,a result of the breeding place survey on mosquito larvae. Ae.albopictus larvae accounted for the highest proportion(51.7%) of the mosquito population,followed by Cx.tritaeniorhynchus, while other species including Cx.mimulus were limited.Conclusion In view of the widely distributed vectors of mosquito-borne diseases in Yiwu and regional concentration of high density,breeding sites should be eliminated to cut off the primary transmission route of vector-borne diseases in order to lay a sound foundation for further prevention and control.