氟氯氰菊酯浸帐防制疟疾媒介按蚊的效果观察

EFFECT OF BEDNETS IMPREGNATED WITH CYFLUTHRIN ON CONTROL OF MALARIA VECTORS OF ANOPHELES

目的 观察氟氯氰菊酯浸帐防制疟疾媒介按蚊效果。 方法 在疟疾暴发流行点 ,以 12 .5 %氟氯氰菊酯水乳剂按 15mg/m2 帐面的剂量 ,对居民的蚊帐实施浸泡 ;定时、定点室内晨间帐内、室外人诱和猪舍内捕蚊观察按蚊密度 ;通过疟史调查了解疟疾发病情况。 结果 浸帐后连续 2年居民帐内嗜人按蚊和中华按蚊密度分别较浸帐前下降了10 0 .0 0 %和 99.93 %。浸帐当年未浸泡居民帐内仍可捕到两种按蚊 ;室外人诱及猪舍内嗜人按蚊密度有所回升 ,但室外人诱该蚊占按蚊的比率显著下降。第 2年后两种捕蚊方法未再捕到嗜人按蚊 ,而中华按蚊则维持较高密度 ,显示浸帐对降低中华按蚊种群数量的效果不佳。疟疾发病率从浸帐前 (1999年 )的 2 1.0 1%下降至 2 0 0 1年的 1.3 8%。 结论 一次氟氯氰菊酯浸泡蚊帐 ,可明显降低嗜人按蚊密度 ,能有效控制疟疾的暴发流行。

Objective To observe the effect of bednets impregnated with cyfluthrin on control of malaria vectors of Anopheles. W Methods In malaria outbreak epidemic spot, the resident’s bednets were impregnated with 12.5% flowable formulation cyfluthrin in the dose of 15 mg/m 2 in residential area. Mosquitoes were captured at a fixed time and place. The densities of Anopheles were measured in the bednets at morning, outdoor with human bait and in pigsty respectively. The situation of malaria epidemic was understood by investigating malaria history. W Results Comparing with that of before treatment, the densities of Anopheles anthropophagus and An. sinensis in bednets were continuously decreased by 100.00% and 99.93% in 2 years after treatment. At the years of treatment, 2 kinds of Anopheles could be captured in bednets un impregnated and the densities of An. anthropophagus measured by both outdoor with human bait and in pigsty were increased. But comparing with Anopheles, the ratio of An. anthropophagus captured outdoor with human bait was declined apparently. An. anthropophagus could not be captured by both methods next year of the treatment. The density of An. sinensis was continuously maintained in high level after treatment. It showed that it was not good enough to decrease the population quantity of An. sinensis by impregnated bednets. Conclusion The density of An. anthropophagus was declined obviously and the situation of malaria outbreak epidemic was controlled after impregnated bednets with cyfluthrin once.