尾蚴是血吸虫生活史中被证明具有感染性,侵入人体致病的时期。尾蚴穿入接触了疫水的易感者皮肤表皮内成为童虫,停留十几小时以上,进入真皮,穿入毛细血管而进入血循环,再移行至肺,最后到肝脏和门静脉系统,发育为成虫。成虫及产出的卵导致免疫病理反应造成血吸虫病。可见,在预防血吸虫病中,阻止尾蚴穿入皮肤是关键环 Cercariae is a period of schistosome life history has proved infective, invaded the human pathogenic period. Cercariae penetrate into contact with epidemic water of susceptible skin epidermis into a pest, stay more than ten hours into the dermis, into the capillaries and into the blood circulation, and then migrate to the lungs, and finally to the liver and portal vein system, the development of adult worms . Adult and egg production results in immunopathology causing schistosomiasis. Can be seen in the prevention of schistosomiasis, prevent cercariae penetrate the skin is the key ring