Abstract:

Objective Master the species, seasonal dynamics, and distribution of Aedes mosquito vectors, and incidence of dengue in Wanzhou district, to assess the risk of dengue fever, provide the basis for the prevention and control of dengue fever. Methods Monitoring the density of Aedes larva by Breteau index method, investigating the density of mosquito population by double stack method, analyzing the case data using the method of comparative analysis of epidemiology. Results There was 1 imported case of dengue fever in Wanzhou area in 2015, the incidence was 0.62/100 000, there was no case of epidemic spread due to the imported case. Monitoring the mosquito vectors density in 4 sites in the May through October in 2015, Aedes Breteau index fluctuated between 3.74-7.54. Fifteen mosquitoes were caught in 6 rounds of trapping with double stack method, of which 1 was the Anopheles sinensis, 14 were the Armigeres obturbans. The 6-round of trapping in the monitoring did not capture the vectors of dengue fever, the Aedes mosquito bite index was zero. Conclusion The human population flow in this area is frequent, there are many migrant workers in Burma, Guangdong, Yunnan and the other places, this is a high possibility of imported case, but a low risk of local outbreaks of dengue fever, suggesting to strengthen the monitoring to prevent epidemic.

Key words: Dengue fever, Vectors, Aedes albopictus, Surveillance

摘要：

目的 掌握重庆市万州区登革热情况及其传播媒介伊蚊的种类分布、密度及季节消长规律，评估登革热流行风险，为登革热的预防控制提供依据。方法 2015年5－10月，在4个监测点开展蚊幼虫密度监测，采用布雷图指数法监测伊蚊幼虫密度，双层叠帐法调查成蚊种群密度；采用流行病学比较法分析病例资料。结果 2015年万州区登革热输入性病例1例，发病率为0.62/10万，未发生因该输入病例造成的疫情扩散。在4个监测点开展蚊幼虫密度监测，伊蚊布雷图指数为3.74~7.54，5－10月采用双层叠帐法共监测6次，捕获成蚊15只，其中中华按蚊1只，骚扰阿蚊14只。均未捕获到登革热媒介目标蚊种，成蚊、伊蚊叮咬指数均为0。结论 万州区人口流动频繁，发生输入病例的可能性大，该区有登革热传播媒介白纹伊蚊分布，存在因登革热输入性病例引发本地疫情暴发的低风险，应加强监测。

关键词: 登革热, 传播媒介, 白纹伊蚊, 监测