目的：研究血吸虫单次感染和多次感染两种方式对宿主肝纤维化的影响。
Objective: to study the degree of fibrosis in the host livers caused by single-infection and multiple-infection of schistosoma.
从目前已有的记录来看，60 %以上的单殖吸虫只有1种宿主，约75%的单殖吸虫的宿主仅为1属，超过97%的单殖吸虫的宿主在1科之内。
According to published records, more than 60% species of monogeneans were found only on 1 host species, and about 75% species on 1 host genus, over 97% species on 1 host family.
抑制或干扰上述基因的表达对单殖吸虫宿主特异性的影响。
What will happen to parasite in differentiating close related hosts if the relevant gene was silenced or interrupted?
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