Abstract：Objective To investigate the common species and density of mosquitoes and their seasonal variation at vector surveillance sites in Heilongjiang province, China, and to provide a basis for risk assessment of mosquito-borne diseases and scientific development of mosquito prevention and control measures. Methods Mosquito surveillance data from 2007 to 2017 were collected from vector surveillance sites in Heilongjiang province; the data were compared for the differences in mosquito density between various species and habitats as well as their seasonal variation; Microsoft Excel 2016 software was used for statistical analysis. Results From 2006 to 2017, the total mosquito density was 2.26 mosquitoes/lamp·hour at the vector surveillance sites in Heilongjiang province; the mosquito species composition was dominated by Anopheles sinensis, accounting for 40.15% of the mosquitoes captured; the density of An. sinensis was highest, up to 0.91 mosquitoes/lamp·hour; the highest density was in livestock sheds (up to 6.12 mosquitoes/lamp·hour), followed by rural households (2.70 mosquitoes/lamp·hour); the seasonal variation in mosquito density of different species and habitats showed a single-peak trend, with the highest density in July and August. Conclusion Except for the density in 2007 (which is relatively high), the density of mosquitoes at the vector surveillance sites in Heilongjiang province from 2008-2017 shows a small-amplitude wavy decline; An. sinensis is the dominant species; the density is highest in rural areas, which are the key areas for mosquito prevention and control; mosquito activity peaks in July and August, which are the key periods for prevention and control measures.
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