Fresh-water snails were collected from the fields for examining cercariae.
现场采集标本，剖检淡水螺类，检查并殖吸虫尾蚴感染情况。
These organisms penetrate into snails, multiply, and develop into cercariae, the infective form for man.
这些毛蚴进体螺体，繁殖和发育对人类有传染性的尾蚴。
ObjectiveTo observe the effect of varnish "Fangyouling" preventing skin invasion from Schistosoma cercariae.
目的观察“防蚴灵”涂肤剂预防血吸虫尾蚴感染的效果。
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