中华按蚊对马来丝虫微丝蚴易感性的观察

目的：研究中华按蚊对不同密度马来丝虫微丝蚴以及贵州和浙江两地虫源的易感性。方法：观察中华按蚊感染不同密度马来丝虫微丝蚴（ｍｆ）后蚊虫的存活率、蚊虫体内微丝蚴发育至感染期蚴（Ｌ３）率和感染蚊体内Ｌ３平均条数，同时观察浙江虫源（６代）和贵州虫源（３１代），微丝蚴发育至Ｌ３率。结果：感染微丝蚴密度为３２．５ｍｆ／μｌ和１４１． ５ｍｆ／μｌ组的微丝蚴发育至Ｌ３率分别为３６．２％和８．７％，感染蚊体内Ｌ３平均条数分别为８．２４和０．３条。中华按蚊感染浙江虫源（６代）和贵州虫源（３１代），微丝蚴发育至Ｌ３率分别是４５．１％和２６．８％。结论：中华按蚊对感染密度为３２．５ｍｆ／μｌ－６６．４ｍｆ／μｌ时较易感，其对浙江虫源（６代）较贵州虫源（３１代）易感。

OBSERVATION ON THE SUSCEPTIBILITY OF ANOPHELES SINENSIS TO PERIODIC BRUGIA MALAYI MICROFILARIAE *

AIM: To explore the susceptibility of Anopheles sinensis to Brugia malayi microfilariae of different densities. METHODS: The survival rate of mosquitoes, the rate of microfilariae penetrating through midgut, the mature rate of larvae into infective larvae (L3) and the mean number of L3 in the survived mosquitoes were observed. RESULTS: With the microfilariae densities of 32.5 mf/microliter and 141.5 mf/microliter, the rate of larvae matured into L3 was 36.2% and 8.7%, respectively, the mean number of L3 recovered from infected mosquitoes was 8.24 and 0.30, respectively. CONCLUSION: An apparently higher susceptibility of An. sinensis to B. malayi was found by using B. malayi microfilariae density of 32.5-66.4 mf/microliter.