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１９９２年在海南山区和平镇贝湾管区设点，观察溴氰菊酯浸泡蚊帐防制大劣按蚊及控制疟疾传播的效果，结果显示，观察点居民疟疾年带虫发病率在抗疟药物压力下降低，居民带虫率浸帐后较浸帐前高，但对大劣按蚊密度和季节高峰的出现未见影响，疟疾的传播未能阻断，似乎与人群夜间就寝前在村内活动密切相关，大劣按蚊对溴氰菊酯产生抗性的问题亦值得注意。
In 1992, the Beiwan District of Heping Town, Hainan Province was set up to observe the effect of deltamethrin-impregnated mosquito nets in controlling Anopheles dirus and controlling the spread of malaria. The results showed that the incidence of annual malaria parasites in observation points was significantly lower than that of antimalarial drugs Down, residents with insects dipped higher than before dunking, but no significant effect on the density and seasonal peak of Anopheles dirus, malaria transmission failed to block, it seems that with the crowd before going to bed at night close to the activities in the village close It is also noteworthy that the development of resistance to deltamethrin by Anopheles stephensi is noteworthy.