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应用安徽贵池同一来源并经实验室传代的日本血吸虫毛蚴和子１代湖北钉螺湖北亚种为实验材料，研究毛蚴的数量及时龄对钉螺感染的效应。以１、５、１０、２０和４０个毛蚴分别感染单个钉螺后，对钉螺感染率、死亡率、尾蚴逸出前期及尾蚴逸出数量等进行了观察。感染多个毛蚴组的钉螺感染率显著地高于单个毛蚴组的，但每螺感染２０或４０个毛蚴组的钉螺死亡率也明显增加。钉螺于感染不同数量毛蚴后的尾蚴逸出前期和最初６０ｄ内逸蚴总数并无显著差别，但感染４０个毛蚴钉螺组的尾蚴逸出高峰则明显地延迟。以１、４、８和１２ｈ龄毛蚴分别感染单个钉螺后，８－１２ｈ龄组的钉螺感染率明显地较１－４ｈ龄组的为低，但两者的尾蚴逸出前期则无差别。
Using the same source from Guichi, Anhui, and the laboratory passage of Schistosoma japonicum miracidia and the first generation of Hubei snail Hubei subspecies as experimental materials, to study the number and age of miracidia on snail infection. After infection with a single snail by 1, 5, 10, 20 and 40 miracidia respectively, the infection rate and mortality of snail, the pre-escalation of cercariae and the number of cercariae escaped were investigated. Infection with several miracidia groups was significantly higher than that of individual mirabilis groups, but the mortality of snails was also significantly increased after infection with 20 or 40 miracidia. There was no significant difference in the total number of the larvae of Cercospora nodosum in the early stage of cercariae ’s excretion and the first 60 days after infected with different numbers of Cercariae, but the peak of escape of Cercariae in 40 Cercaria larvae was obviously delayed. After infection with a single snail at 1, 4, 8 and 12 hours, respectively, the infection rates of snails in the 8-12h group were significantly lower than those in the 1-4h group, but there was no difference between the two groups.