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在一定的自然条件及社会因素下,寄生虫,宿主及媒介三者的关系是构成丝虫病流行的主要因素。蚊媒传播丝虫不仅与人群微丝蚴率有关,而且与宿主血中微丝蚴密度有密切关系。Sasa(1976)指出,丝虫传播能力主要是以微丝蚴率和微丝蚴密度确定。并提出了估计媒介理论感染率的方法。但这估计可因人群防蚊设备及生活习惯而有很大差别。为了探讨广东地区的情况,1979～1980年的蚊媒高峰季节,在粤北乐昌进行了低密度微丝蚴与致乏库蚊自然感染及人工感染的实验观察。
Under certain natural conditions and social factors, the relationship between parasites, host and vector is the main factor that constitutes the prevalence of filariasis. Mosquito-borne filariasis not only with the crowd microfilaria rate, but also with the host blood microfilaria density is closely related. Sasa (1976) pointed out that the filarial transmission capacity is mainly determined by the microfilariae rate and microfilaria density. And put forward a method to estimate the infection rate of the medium theory. However, this estimate may vary widely due to the mosquito control equipment and lifestyle of the population. In order to investigate the situation in Guangdong, the natural mosquitoes and artificial infections of Culex pipiens pallens with low density microfilariae and Culex pipiens pallens were studied in Lechang, Guangdong during peak season of mosquito from 1979 to 1980.