The iofection rates of first interndiste hosts were 1. 33%(507/38189) in Pathendus botIdus, 0. 329% (235/73345) in Bithynia fuchsianus.

• 主要第一中间宿主的感染率； 纹沼螺为1.；33%25（507/38189），赤豆螺为0