湘北(岳阳)地区中华按蚊纵向调查结果分析

Results of longitudinal investigation of Anopheles sinensis in Northern Hunan

目的 为进一步了解按蚊种类及生态习性与湘北地区疟疾发病关系。方法 通过人、牛房、野外栖息场所及通宵观察所捕的所有雌性按蚊逐个鉴定 ,结合幼虫形态及单管饲养成蚊产卵作卵型鉴定确定蚊种 :观察按蚊季节消长、寿命及叮人频率与疟疾发病的关系。结果 在不同条件环境中捕获的成蚊、幼虫、卵 ,经鉴定为中华按蚊类群种 ,仅山区为少量贵阳按蚊 ,按蚊季节消长、叮人频率与疟疾规律基本相符 ;中华按蚊人血指数为 2 .1%,按蚊平均寿命长于间日疟孢子增殖期。结论 中华按蚊是湘北地区目前唯一的间日疟媒介蚊种。

Objective To further understand the relationship between the vectors and its ecological habit with malaria infection in Northern Hunan Province(Yueyang City).Methods The female mosquitoes captured overnight in human houses,cattle sheds,its resting place in the field identified one by one in combination with identification of larval morphology and the shape of the egg laid by the cultured adult mosquitoes,the mosquito species were determined.In addition,the relationship between the seasonal increase and decrease of anophelines,its longevity as well as man-biting rate with malaria infections was also observed.Results The adult mosquitoes,larvae and eggs collected from different environment and under various conditions were identified to be An.sinensis,only a few of them captured in mountainous areas were identified to be An.guiyangensis.The seasonal increase and decrease,man-biting rate were coincident with the regulation of malaria infection.It was also noticed that the human blood index of An.sinensis was 2.1% and the average longevity of the mosquitoes was longer than the sporogony of plasmodium vivax.Conclusion An.sinensis is the only malaria vector in Northern Hunan Province.