活動體(trophozoite),又稱滋養體,是原蟲類寄生蟲(Protozoan parasites)生活史上的一個活躍、有運動性繁殖的階段。活動體之後會發展成裂殖體(schizont)階段,即成為一個母細胞寄生蟲在活動體的階段,易侵入組織造成病變

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