Analysis on correlation between the density of dengue fever vector and climatic factors in Yunfu City

LAI Hui-bing; LUO Li-kuang; OU Qing-hua; FENG Zi-lai; ZHANG Hua; HE Zhong-qiang; ZHONG Hong-miao; LEI Jie-zhen; CHEN Xiao-min

Abstract：Objective To survey the density of dengue fever vector and its seasonal fluctuation,and analyze the correlation bctwccn mosquito density and climatic factors so as to provide scientific evidence for monitoring and preventing dengue fever in Yunfu City.Methods Breteau index method and ovitrap methods were employed for mosquitoes density survey,and the relationship between mosquito surveillance data and climate variables from 2015 to 2016 were analyzed.Results The mean densities of Aedes breteau index were 2.63-6.38 from March to November in 2015-2016,and the mosquito trapping index were 2.34-8.14.There was a positive correlation between the mean densities of Aedes Breteau index and mosq-ovitrap index (r =0.666 5,tr =3.575 8,P ＜ 0.01),and between the densities of mosquito and the monthly mean temperature (BI:r =0.648 3,tr =3.406 1,P ＜ 0.01;MOI:r =0.712 5,tr=4.061 8,P ＜0.01),and pre-one-month precipitation(BI:r =0.615 4,tr =3.122 8,P ＜0.01;MOI:r =0.568 2,tr=2.761 7,P ＜0.05),and pre-one-month sunshine(BI:r =0.485 9,tr =2.223 8,P ＜0.05;MOI:r =0.483 4,tr =2.208 7,P ＜ 0.05).while a negative correlation between the densities of mosquito and the monthly mean atmospheric pressure(BI:r =-0.480 8,tr =2.193 1,P ＜0.05;MOI:r =-0.629 4,tr =3.239 8,P ＜0.01).There was no linear correlation between the densities of mosquito and the monthly mean relative humidity(BI:r =-0.135 1,tr =0.545 2,P ＞0.05;MOI:r =-0.629 4,tr =3.239 8,P ＜ 0.01),and the monthly mean wind speed (BI:r =-0.164 8,tr =0.668 5,P＞ 0.05;MOI:r =0.036 2,tr =0.144 7,P ＞ 0.05).Conclusion The density of Aedes albopictus was at a high level during summer and autumn in Yunfu,and affected by the monthly mean temperature and pre-one-month precipitation,and pre-one-month sunshine and the monthly mean atmospheric pressure.