Abstract: Objective To investigate the density and seasonal fluctuation of Aedes larvae as a dengue vector in Zhejiang province, China, 2021, and to provide basic data for the prevention and control of mosquitoes and related infectious diseases in urban and rural areas. Methods The surveillance data of Aedes larvae in Zhejiang from April to November in 2021 were analyzed. The rank sum test (Kruskal-Wallis test) for multiple samples was used to analyze the differences in annual average Breteau index (BI) in different regions. The Chi-square test was used to analyze the differences in the positive rate of different types of stagnant water containers. ArcMap 10.8 software was used to draw the monthly distribution of BI in Zhejiang province. Results In 2021, the peak density of Ae. albopictus in Zhejiang was observed from May to October. The annual average BI and container index (CI) were 14.16 and 21.34%, respectively. Both BI and CI showed bimodal curves, with the highest values in June. Positive results were mainly found from idle water containers (bowls, bottles, jars, tanks), storage tanks and basins, and bonsai and aquatic plants. Conclusion Ae. albopictus is widely distributed in the urban and rural residential areas of Zhejiang, with high density in summer and autumn. It is recommended that all cities carry out in-depth environmental improvement and public health education to eliminate mosquito breeding sites and reduce the risk of outbreaks of mosquito-borne diseases such as dengue fever.

Key words: Aedes albopictus, Breteau index, Container index, Dengue fever

摘要： 目的 掌握2021年浙江省登革热媒介伊蚊幼虫密度和季节消长情况，为城乡蚊虫及其相关传染病的预防控制提供基础资料。方法 对2021年4－11月浙江省伊蚊幼虫监测数据进行统计分析。采用多样本秩和检验（Kruskal-Wallis检验）分析不同区域年均布雷图指数（BI）差异。采用χ²检验分析不同类型积水容器阳性率差异。应用ArcMap 10.8软件绘制全省BI月分布图。结果 2021年浙江省白纹伊蚊密度高峰期为5－10月，年均BI、容器指数（CI）分别为14.16和21.34%，BI和CI均呈双峰曲线，最高值均出现于6月。阳性积水类型主要为闲置容器（碗、瓶、缸、罐）、贮水池和缸盆以及盆景和水生植物。结论 白纹伊蚊在浙江省城乡居民区广泛分布，夏秋季密度较高。建议各地深入开展城乡环境整治和居民健康教育，清除蚊虫孳生地，降低登革热等蚊媒传染病的暴发流行风险。

关键词: 白纹伊蚊, 布雷图指数, 容器指数, 登革热