Analysis of surveillance data of dengue vector Aedes mosquitoes in Mianyang City,Sichuan Province from 2016 to 2022

CHEN Hua; WEN Yan; ZHANG Zhao; WU Shuang; ZHANG Xiande; ZHOU Wanming

doi:10.19821/j.1671-2781.2023.05.014

Abstract：Objective To understand the density and seasonal of dengue vector Aedes mosquito in Mianyang city,Sichuan province,and to provide scientific basis for targeted control measures.Methods Breteau index(BI)and double-layer net method were used to monitor the larvae and adult of Aedes mosquitoes respectively in Mianyang from 2016 to 2022,and the monitoring results were summarized and analyzed.SPSS19.0 software was used for statistical analysis,Chi-square test was used for comparison of the median rate of classified data,non-parametric rank sum test(Kruskal-wallis test)was used for comparison of the differences between the two indexes.The test level was 0.05.Results Only Ae.albopictus was collected in Mianyang from 2016 to 2020.The average BI of Ae.albopictus larvae ranged from 2.17 to 43.17,with significant difference(H= 29.516,P＜0.001).The CI ranged from 2.52%to 26.24%,with significant difference(χ2= 197.581,P＜0.001),and the average net trapping index of adult from 0.78 to 4.22 per net per hour,with no significant difference(H= 12.463,P= 0.052).The highest density of Ae.Albopictus appeared from July to September,monthly density significant difference in CI(χ2= 34.756,P＜0.001).Idle containers accounted for the highest ratio of all breeding containers up to 50.32%.The highest CI were found in bamboo tube,tree hole,stone hole and waste tire,and the CI of different habitats significantly different(χ2 = 57.986,P＜0.001).Conclusion dengue vectors exist in Mianyang.In order to prevent outbreaks of imported dengue fever or local transmission,environmental management focusing on the elimination of breeding sites was carried out to effectively control the density of Ae.albopictus from July to September each year.