During the August and September 2012, seven human cases of the West Nile neuro-invasive disease were reported in Croatia. Medical entomology research on a potential vectors during the outbreak was supported by the Ministry of Health. A mosquito survey has been done in 64 sites in three eastern Croatian counties (Osijek-Baranja County, Vukovar-Srijem county and in Brod-Posavina county). Dry ice baited CDC traps were used for mosquito sampling in a period from the 10th to 25th September 2012. A total of 1785 mosquitoes were collected and 5 species were determined. The most numerous species were Aedes vexans with 1634 specimens, a Culex pipiens c., the potential vector of WNV, was present with 6.39%, in 114 specimens. That species was present in 43 out of 64 investigated sites. Vector control included both the control of mosquito larvae and the adults. Treatments have been done on 184 small breeding sites and on 2900 ha of an urban area.
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