嗜人按蚊不同发育阶段溴氰菊酯敏感性分析

目的 研究嗜人按蚊不同发育期溴氰菊酯敏感性动态变化。方法选用室内选育的嗜人按蚊溴氰菊酯敏感品系和抗性品系，以浸渍法测试幼虫溴氰菊酯敏感性，以WHO推荐的接触筒强迫接触法测试成蚊溴氰菊酯敏感性。结果幼虫期，溴氰菊酯敏感品系和抗性品系对杀虫剂的敏感性由低至高依次均为Ⅳ、Ⅲ、Ⅱ龄幼虫；成蚊期，两种品系的敏感性均以早期成蚊最低，中期成蚊次之，晚期成蚊最高。结论嗜人按蚊两品系不同生长期溴氰菊酯敏感性消长相似，敏感性水平随幼虫的发育而上升，随成蚊蚊龄增长而下降。

ANALYSIS ON THE DYNAMIC CHANGES OF SUSCEPTIBILITIES TO DELTAMETHRIN IN DIFFERENT DEVELOPMENT STAGES OF ANOPHELES ANTHROPOPHAGUS

Objective To study the dynamic changes of susceptibilities to deltamethrin in different development stages of Anopheles anthropophagus. Methods Both of susceptible strain and deltamethrin-resistant strain of An. anthropophagus were cultured from laboratory. The susceptibilities of different larva stages have been tested by impregnated method, and susceptibilities of different a- dult stages have been tested by chamber method recommended by WHO. Results The results indicated that the different suscepti- bilities of An. anthropophagus were shown in the different stages, from low to high, in the forth, third and second instar larva; the early, middle and later stage adults. The kinetic changes of susceptibilities in different development stages of An. anthropophagus were similar between susceptible strain and deltamethrin-resistant strain. Conclusion The susceptibility was increasing with larva development, but it was decreasing with adult development.