Comparison of seasonal fluctuation and nocturnal activity patterns of Anopheles sinensis in different regions of Jiangsu pronince

Objective To make a clear understanding of seasonal fluctuation and nocturnal activity patterns of Anopheles sinensis in different areas of Jiangsu province.Methods In 2011,13 townships were selected from each of the 13 cities in Jiangsu province as malaria vector monitoring sites,and indoor overnight capture of malaria vectors with human bait in the bed nets was used to survey the seasonal fluctuation and nocturnal activity patterns of Anopheles sinensis in each monitoring site.Results Totally 2 044 mosquitoes were captured from 13 monitoring sites,all the mosquitoes identified were Anopheles sinensis and no Anopheles anthropophagus was detected.The density peak of seasonal fluctuation of Anopheles sinensis was at second half of July,and there were no significant differences in number in the southern,middle and northern parts of this province(F=1.769,P=0.19).The nocturnal activity peak of Anopheles sinensis was 3 hours from 19:00 to 22:00,and 67.91% of the 1 388 Anopheles sinensis were captured in the 12 time intervals.Another small peak appeared from 5:00 to 6:00 and 184 Anopheles sinensis were captured,accounted for 9.00% of the mosquitoes captured in 12 time intervals,showing significant differences in number in three parts of the province(F=291.88,P=0.000).Conclusions Individual protection and monitoring be strengthened to avoid mosquito bite and reduce the transmission of malaria.