轉續宿主(paratenic host)是指被某些寄生蟲的幼蟲侵入後寄生蟲不能發育為成蟲、但能存活並長期維持幼蟲狀態的非適宜宿主。只有當這些寄生蟲其侵入適宜宿主體內時,才能發育為成蟲。[1][2]轉續宿主在寄生蟲生命周期中起到橋樑作用,彌補生態或食物鏈中的空隙。[3]如犬錐蟲(T. canis)在宿主間傳遞時,除非宿主是犬科動物,否則不會發生任何發育,這些能夠使能犬錐蟲存活並長期維持幼蟲狀態的宿主即為轉續宿主。[4]對於衛氏並殖吸蟲(Paragonimus westermani),其適宜宿主為人、犬等,1975發現因生食野豬肉導致衛氏並殖吸蟲感染的病例後,研究確定野豬為衛氏並殖吸蟲的轉續宿主。[5][1]
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