复殖目寄生虫在软体动物体内的发育对宿主繁殖功能有抑制作用。雷蚴能侵蚀宿主螺的性腺组织及神经内分泌系统 ;胞蚴对宿主螺有“阉割”作用 ,复殖目寄生虫与其中间宿主软体动物存在互相拮抗作用。雷蚴能积极地抑制其他寄生虫幼虫而表现出主动的拮抗作用 ,胞蚴只能引起由宿主螺 The development of the complex-producing parasite in molluscs inhibits the reproductive function of the host. Echinococcus can invade the gonadal tissue and neuroendocrine system of the host spirochete; the cercariae have a “castration” effect on the host spirochete, and the antagonistic interaction between the complex sporidae and its intermediate host mollusc is antagonistic. Echinococcus can actively inhibit other parasite larvae and showed active antagonism, cytomegalovirus can only cause by the host snail