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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。
Objective To understand the dengue fever and the species distribution, density and seasonal fluctuation of Aedes mosquitoes in Wanzhou District of Chongqing and to evaluate the epidemic risk of dengue and provide basis for the prevention and control of dengue fever. Methods From May to October 2015, mosquito larvae density monitoring was conducted at 4 monitoring sites. The density of mosquito larvae was monitored by the Brettizer index method. The population density of mosquitoes was investigated by double lamination method. The epidemiological comparative method was used to analyze the case data. Results In 2015, 1 case of imported dengue fever was found in Wanzhou District, with an incidence rate of 0.62 / 100 000. There was no epidemic situation caused by this imported case. The mosquito larvae density monitoring was carried out at 4 monitoring sites. The Aedes Brett index was between 3.74 and 5.44. From May to October, the double-check method was used to monitor 6 mosquitoes for a total of 15 mosquitoes, including 1 Anopheles sinensis, harassment 14 mosquitoes None of the target species of dengue vector was captured, and the indices of mosquitoes and Aedes mosquito bites were all 0. CONCLUSIONS: Wanzhou District has frequent population movements and a high incidence of imported cases. There is a distribution of dengue vector Aedes albopictus in this area. There is a low risk of outbreaks of local outbreaks caused by imported dengue cases, and surveillance should be strengthened.