卫氏并殖吸虫囊蚴经口感染小鼠后,所有虫体长期滞育。将滞育童虫感染小鼠,则短期内虫体发育势态呈明显分化:8.7％的童虫迅速发育,3周内增长至感染前的3倍以上,成为具有生殖器官雏形的大型童虫;其余童虫仍为滞育状态。再将这部分滞育童虫经口在小鼠间反复转换宿主,均出现见发育势态的分化,经3次转换后的滞育虫体仍可在犬体内发育成熟,提示宿主转换具有一定意义。 Paragonimus westermani metacercariae orally infected mice, all parasites long diapause. The diapause schistosomiasis infected mice, the short-term developmental status of the worms were significantly differentiated: 8.7% of the rapid development of schistosomiasis, increased to 3 times before 3 weeks of infection before becoming infected with large-scale genital organs; The rest of the wolves still diapause. Then this part diapause squirrel oral repeated transcribed host in mice, are seen to see the development trend of differentiation, after 3 times the conversion of the stranded larvae can still mature in dogs, suggesting that the host conversion has some significance .