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１９８０～１９８３年，在班氏丝虫病中度流行区的１４个村舍，解剖蚊媒３２３４５只，自然感染率３．３１％。结果表明：淡色库蚊为班氏丝虫病的传播媒介；微丝蚴进入蚊体后，可有５２．２９％发育至感染期幼虫；蚊媒自然感染率多随人群微丝蚴率和感染者微丝蚴平均密度的高低而升降。从有的村不呈相应升降和人群、蚊媒感染率出现自然下降的情况提示，在研究阻断丝虫病的传播阈值时，除病原生物学外，还须结合社会和自然因素综合考虑。在不同地区和不同的流行阶段，这项阈值应该是相应的，而非相同的。１９８７年达到基本消灭丝虫病标准后，当年自然感染率降到０．０３％（１／４０３７）；１９９０～１９９２年为０．１８％（１９／１０７４４），虫期均系脱鞘微丝蚴；１９９３年已无阳性蚊发现（０／２０２０），显示传播已阻断。
From 1980 to 1983, there were 14,345 mosquito-borne mosquitoes in 14 villages in the endemic area of Bancrofoo filariasis, with a natural infection rate of 3.31%. The results showed that: Culex pipiens pallens were the transmission media of Bancroftian filariasis. After entering the mosquito, the microfilariae larvae developed 52.29% The average density of microfilariae and the rise and fall. From some villages there is no corresponding movements and populations, the natural decline of mosquito vectors showed that, in studying the transmission threshold of filarial disease, in addition to the pathogenic biology, we must also consider the combination of social and natural factors. In different regions and different stages of the epidemic, this threshold should be corresponding, not the same. In 1987, after the basic criteria for the elimination of filariasis were reached, the natural infection rate in that year dropped to 0.03% (1/4037); from 1990 to 1992, it was 0.18% (19/10744) Echinococcosis; no positive mosquito was found in 1993 (0/2020), indicating that transmission has been blocked.