Surveillance results of malaria vectors Anopheles in Longlin Gezu Autonomous County of Guangxi, 2014-2018

Abstract

Objective To understand the species composition, quantity and seasonal fluctuation of malaria vector in Longlin Gezu Autonomous County, so as to provide scientific basis for formulating prevention and control strategies in the late stages of malaria eradication.

Methods Villages that there were many kinds of malaria vectors, and where malaria epidemic was more serious were selected as surveillance sites in Longlin Gezu Autonomous County from 2014 to 2018. The vector monitoring work was carried out by all-night mosquito trapping with mosquito trap lampsin human house, livestock house and outdoor from April to October every year (Two times in the first ten days and two times in the late ten days of each month), and the captured Anopheles were identified by morphology.

Results A total of 35 952 Anopheles of 11 species were captured in Longlin Gezu Autonomous County from 2014 to 2018, among which Anopheles.sinensis accounted for 99.33% (35 712/35 952). Other Anopheles only accounted for 0.67% (240/35 952), capturing 68 An. maculatus, 21 An.vagus, 10 An.tessellatus and 10 A n. paden, 5 An.stephene, 4 An.varuna, 2 An. annularis, 8 An.splendidus, 94 A n. hannanpu subspecies, and 4 An.minimus, 14 could not be identified. An.jeyporiensis candidiensis was not captured. The number of Anopheles captured in the survey sites was from high to low: livestock house > outdoor > human room; the number of Anopheles in different years showed a decreasing trend year by year, and the peak of the activity season was from May to August.

Conclusion The number of Anopheles decreased year by year in Longlin Gezu Autonomous County, the highest density of Anopheles is in livestock houses, and the peak of activity season is from May to August. An.sinensis is the main malaria vector, An.jeyporiensis candidiensis was not captured, but there are still a small number of An.minimus.

Abstract

摘要： 目的 了解隆林各族自治县传疟媒介按蚊种群组成、数量及季节消长情况, 为制定消除疟疾后防控策略提 供科学依据。 方法 2014—2018 年选择隆林各族自治县历史上发现传疟媒介按蚊种类较多、疟疾流行较严重的村屯 作为监测点, 于每年 4—11 月份每月上旬两次、下旬两次在人房、畜舍和户外采用诱蚊灯全通宵捕蚊法开展媒介监测工 作, 并对捕获按蚊进行形态学鉴定。 结果 2014—2018 年隆林各族自治县在各监测点共捕获按蚊 11 种 35 952 只, 其中 中华按蚊占按蚊总数的 99.33% (35 712/35 952); 其他按蚊仅占 0.67% (240/35 952) , 分别为多斑按蚊 68 只、迷糊按蚊 21 只、嵌斑按蚊和派登按蚊各 10 只、斯替芬按蚊 5 只、印神按蚊 4 只、环斑按蚊 2 只、美彩按蚊 8 只、汉南浦亚种 94 只、微小 按蚊 4 只、无法鉴定 14 只。未捕获日月潭按蚊。调查场所捕获按蚊数由高到低为：畜房>室外>人房; 不同年度按蚊捕 获数呈逐年下降趋势; 按蚊活动季节以 5—8 月为高峰。 结论 隆林各族自治县按蚊数量呈逐年减少趋势, 畜房密度最 高, 活动季节以 5—8 月为高峰; 传疟媒介以中华按蚊为主, 未捕获到日月潭按蚊, 但仍存在少量微小按蚊。