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在浙江、河南等１１个省、自治区选择经过海群生防治、丝虫和蚊媒种类有代表性的地方建点２１个，不采取防治措施，纵向观察３－５年。主要结果：①２７９例残存微丝蚴血症者大部陆续自然转阴；②微丝蚴率，２０个点逐年下降，１个点徘徊在原水平；③１２个点的蚊媒已未查见幼丝虫。结果表明，在以人饵蚊帐诱捕法调查，蚊媒叮人率为２０－５０只／人、夜，和有４０％左右居民合理使用蚊帐防蚊的情况下，２０个点的微丝蚴率，班氏丝虫病点≤１．７１％，马来丝虫病点≤１．５５％，残存微丝蚴血症者６０μｌ血平均密度大多在３－１０条，只有个别的密度较高，丝虫病的传播处于阈值以下，趋于阻断；１个徘徊于原水平的马来丝虫病点，微丝蚴率为２．３１％，有１例微丝蚴血症者密度较高（５４条／６０μｌ），处于丝虫病传播临界水平。
In Zhejiang, Henan and other 11 provinces and autonomous regions choose to go through the sea of mass control, filariasis and mosquito vectors representative of the construction of a site 21 points, do not take preventive measures, longitudinal observation of 3-5 years. Main results: (1) Most of the remaining microfilaremia in 279 patients turned negative one after another; (2) The rate of microfilariae decreased 20 points year by year, hovering at the original level at 1 point; (3) insect. The results showed that in the case of mosquito entrapment rate of 20-50 / person, night, and about 40% of residents use mosquito net mosquito control mosquito repellent, 20 points microfilament rate , Bancroftian filariasis ≤1.71%, Malay’s filariasis ≤1.55%, residual microfilaremia 60μl blood mostly in the average density of 3-10, only a few high density, Transmission of filariasis below the threshold, tends to block; a hovering at the original level of male infestations, microfilaria rate was 2.31%, a case of microfilaremia high density (54/60 μl), at a critical level of filariasis transmission.