Analysis of ecological surveillance results of dengue vector Aedes mosquitoes in Donghu District of Nanchang from 2019 to 2023

LIU Yuefeng; LIU Yangqing; YANG Shu; CHEN Shengen

doi:10.19821/j.1671-2781.2025.03.012

Abstract：Objective To analyze the ecological monitoring data of Aedes mosquitoes,the vectors of dengue fever,in Donghu District of Nanchang from 2019 to 2023,so as to provide scientific basis for effective prevention and control of dengue fever.Methods The Breteau index(BI)method and double-layered cage method were used to monitor Aedes mosquito larvae and adults,and to calculate the BI,container index(CI),and attraction-collection index.Data were collated using Excel 2019 software,and statistical analysis was conducted using SPSS 20.0 softwares.The differences between CI groups in different years were analyzed by the Chi-square test,and the differences in attraction-collection index were compared by analysis of variance to assess the risk of dengue fever transmission.Results From 2019 to 2023,the average BI in Donghu District of Nanchang was 8.57,with an annual average BI ranging from 3.08 to 12.83.The differences in CI between different years were statistically significant(x2=88.635,P＜0.001),with the lowest in 2022 and the highest in 2023.The average attraction-collection index was 1.36 mosquitoes/(trap·hour),with the highest in 2020 and the lowest in 2022.The seasonal fluctuations were not completely consistent each year,with peaks concentrated in June to July.Risk assessment results showed that 76.67％of the monitored months indicated a risk of dengue fever transmission.Conclusion Aedes mosquito density in Donghu District of Nanchang was relatively high,increasing the risk of local transmission of dengue fever caused by imported epidemics,suggesting the need to strengthen and improve comprehensive control measures against Aedes mosquitoes.