Surveillance results of Aedes albopictus and risk assessment of dengue fever transmission in Mianyang City,Sichuan Province from 2017 to 2022
Objective To understand the density,distribution and trend of dengue vector Aedes mosquito in Mianyang City,Sichuan Province,and to provide scientific basis for risk assessment of dengue transmission and vector control.Methods Brego index(BI)and double-layer net method were used to monitor the larval Aedes mosquitoes and adult Aedes mosquitoes in Mianyang City from 2017 to 2022,and the monitoring results were summarized and analyzed.SPSS 19.0 software was used for statistical analysis.Chi-square test was used to compare the rates of classified data.Non-parametric rank sum test(Kruskal-Wallis test)was used for comparison of the differences between the net inductance index and the Breteau index.P＜0.05 was considered to be statistically significant.The risk of dengue transmission was qualitatively assessed according to the Guidelines for Surveillance of Dengue Vector Aedes(2014 edition).Results The dengue fever vector in Mianyang City from 2017 to 2022 was only Aedes albopictus.The average annual density showed a trend of first decreasing and then increasing.The highest density of Aedes albopictus was from July to September of each year.The average annual net trapping index of adult Aedes mosquitoes was 1.88 mosquitoes/nethour.The average annual BI of the larvae was 14.64.There were significant differences in the BI among different years(H=24.857,P＜0.001).The positive rate of Aedes albopictus larvae in bamboo containers was the highest.The CI(container index)of different breeding containers was significantly different(x2=42.012,P＜0.001).Of the 36 months monitored,69.44％had a risk of dengue transmission.Conclusions Due to the high density of Aedes albopictus,there is a risk of dengue transmission in Mianyang City.The patriotic health campaign should be attached importance to and carried out.The mosquito density control measures should be strengthened,mainly by eliminating breeding places and supplemented by chemical mosquito control.
NETL
NSTL
万方数据
