体内游走 migration(of parasite)
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寄生虫为到达终局宿主的寄生部位,在寄主体内沿一定的复杂路线而游走的现象。例如蛔虫卵随食物一起被人摄取,在消化管内孵化,幼虫进入小肠壁的绒毛毛细血管或淋巴管(乳糜管)中,沿着血流或淋巴流经过肝脏或心脏到达肺泡壁,进入肺泡腔内,经由小支气管→支气管→气管→喉头→口咽→食道→胃,再进入小肠,在这里发育为成虫而定居。有时也可出现脱离原来的路线而侵入到其它脏器。
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