Investigation of Anophline mosquitoes and evaluation of malaria re-transmitting risk in Haikou

Abstract

Objective To understand the species, distribution and seasonal fluctuation of anopheles mosquitoes in Haikou city, and we provide scientific basis for assessing the risk of malaria retransmission.

Methods Light trapping (mosquito trap method), animal trapping(animal trap method) and human trapping(human induced stop and fall method) were used to investigate the species and distribution of anopheles mosquitoes in 13 villages in 4 districts of Haikou. One natural village was selected as a monitoring site to study the seasonal growth and fall of anopheles mosquitoes.

Results Totally 1 684 mosquitoes in 9 species of anopheles were collected from 13 distribution sites. An. chigaea accounted for 61.82%, An.sinensis accounted for 34.80%, An. vagus accounted for 2.61%, An.aconitus accounted for 0.24%, An.barbirostris accounted for 0.18%, An. splendidus accounted for 0.12%, An. peditaeniasis accounted for 0.12%, An. anthropophagus accounted for 0.06%, An. tessellatus accounted for 0.06%; From January to December, a total of 1 421 anopheles mosquitoes of 7 species were captured in the monitoring stations. Among them, Anopheles sinensis, Anopheles chigaea and Anopheles meatus accounted for 44.76%, 39.55% and 15.20%, respectively. The number of anopheles mosquitoes increased from April to September, and the number captured from April to November accounted for 93.31% of the whole year. Anopheles sinensis is active all year round.

Conclusion The main species of anopheles in Haikou are Anopheles chigaea, and Anopheles sinensis, Anopheles sinensis and Anopheles anthropophagus are main vector of malaria. The anopheles wide distribution, high density, are operating throughout the year; Anopheles anthropophagus is only found locally and in low density. Haikou is a high re-transmission risk area.

Abstract

摘要： 目的 了解海口市当前的按蚊的种类、分布及季节消长情况, 为评估疟疾再传播风险提供科学依据。 方法 采用灯光诱捕法(诱蚊灯法)、动物诱捕法(动物帐诱法)、人诱捕法(人诱停落法) , 从海口市 4 个区中随机抽取 13 个乡镇所辖自然村进行按蚊种类及分布调查;并选取1个自然村为固定监测点, 研究媒介按蚊季节消长规律。 结果 在 13 个调查点共捕获按蚊 9 种 1 684 只。棋斑按蚊占 61.82%, 中华按蚊占 34.80%, 迷走按蚊占2.61%, 乌头按蚊均占 0.24%, 须喙按蚊占 0.18%, 美彩按蚊占 0.12%, 带足按蚊占 0.12%, 嗜人按蚊占 0.06%, 多斑按蚊占 0.06%;在固定监测点 1~12 月共捕获按蚊 7 种 1421 只。其中中华按蚊、棋斑按蚊、迷走按蚊所占比例分别为 44.76%、39.55%、15.20%。按蚊 数量从 4 月份开始增多, 9 月达到高峰, 4—11 月捕获数占全年 93.31%; 中华按蚊全年都有活动。 结论 海口市当前主 要按蚊种类为棋斑按蚊、中华按蚊。中华按蚊分布广、密度高, 全年均有活动；嗜人按蚊仅在局部地区发现, 且密度较 低, 未发现历史上主要的传疟媒介微小按蚊。海口市属于高再传播风险地区。