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目的分析蚊媒密度及消长与流行性乙型脑炎(乙脑)发病率的相关性,为乙脑的预测预防提供科学依据。方法在桂平市的东、西、南、北、中各随机选择1个乡(镇)的1个村作为蚊媒密度消长调查点,每年在相同时间、使用相同诱蚊灯,对人房、猪圈、牛棚3种环境诱捕蚊虫,统计分析蚊虫种类、密度、消长与同期乙脑发病率的相关性。结果 2003-2008年桂平市捕获蚊虫有4属7种,即三带喙库蚊、二带喙库蚊、致倦库蚊、中华按蚊、微小按蚊、白纹伊蚊和骚扰阿蚊,优势蚊种为三带喙库蚊。每年蚊虫密度4月开始升高,均达40只(/灯·h)以上;5-9月维持在较高密度〔60～500只/(灯·h)〕;10月后回落,与乙脑发病时间分布相一致。结论桂平市蚊媒密度较高,乙脑传播媒介三带喙库蚊是优势蚊种,蚊媒密度消长与乙脑发病率密切相关,应加强对三带喙库蚊的防制工作。
Objective To analyze the correlation between mosquito density and its growth and decline with the incidence of Japanese encephalitis (JE), and provide a scientific basis for the prediction and prevention of JE. Methods One village (town) in east, west, south, north and center of Guiping city was randomly selected as the investigation point of mosquito density decline. At same time each year, Pigs, cattle shed three kinds of environment trap mosquito, statistical analysis of mosquito species, density, growth and decline and the incidence of JE over the same period. Results There were 4 genera and 7 species of mosquitoes caught in Guiping City from 2003 to 2008, that is, Culex tritaeniorhynchus, Culex pipiens pallens, Culex pipiens pallens, Anopheles sinensis, Anopheles sinensis, Aedes albopictus, The dominant mosquito is Culex tritaeniorhynchus. The annual mosquito density increased from April to April, reaching 40 (/ lamp · h) or above; maintained at a higher density (60 ~ 500 / lamp / h) from May to September; Brain onset time distribution consistent. Conclusion The density of mosquito is high in Guiping City, and Culex tritaeniorhynchus is the dominant mosquito species in Jiping City. The mosquito density is closely related to the incidence of Japanese encephalitis. The prevention and control of Culex tritaeniorhynchus should be strengthened.