中华卫生杀虫药械

目的 掌握成都市登革热媒介白纹伊蚊幼虫和成蚊密度的季节性消长规律，为防控工作提供依据。方法 在4—11月每月中旬对监测点进行现场监测，采用布雷图指数(BI)监测白纹伊蚊幼虫密度，采用双层叠帐法监测白纹伊蚊成蚊密度。结果 白纹伊蚊幼虫布雷图指数最高年份为2018年的4.81,最低年份为2021年的2.79;成蚊叮咬指数最高年份为2017年的1.81只/(帐·h),最低年份为2021年的0.40只/(帐·h),总体呈下降趋势。近5年幼虫和成虫的密度6—10月为全年较高时段、7—8月达最高水平，季节性消长明显，呈单峰型；输入性登革热病例数高峰亦出现在6—10月。结论 成都市白纹伊蚊分布广泛，蚊虫密度峰值与输入性登革热病例数峰值相重叠，存在登革热本地传播流行的潜在危险。

Objective To understand the density and seasonal fluctuation of dengue fever vector Aedes albopictus in Chengdu City and provide the scientific evidence for mosquito control.Methods On-site monitoring was conducted in the middle of each month from April to November.Larvae were monitored with the Breteau index(BI) method, while adult mosquitoes with double-net trapping method.Results The highest BI of Aedes albopictus larvae was 4.81 in 2018,while the lowest was 2.79 in 2021.The highest mosqutio-curtain trap index was 1.81 insects per net in an hour in 2017,while the lowest was 0.40 insects per net in an hour in 2021,showing a trend of gradually decreasing.In the five years, the densities of Ae.albopictus larvae and adults showed as a single-peak seasonal fluctuation.The higher mosquito densities usually occurred from June to October and the peak appeared in July and August.The peak of imported dengue fever also occurred from June to October.Conclusion Ae.albopictus was widely distributed in Chengdu City.The peak time of the mosquito density overlapped with the imported dengue fever, indicating the potential risk of dengue fever epidemic in Chengdu.