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目的虽然一种贝类可作数种吸虫的中间宿主,但在各吸虫种类都存在的一自然环境中,它们共同贝类宿主的一个体通常只携带一种吸虫幼虫期。作者利用这一规律在湖南汉寿目平湖血吸虫病区进行媒介钉螺的调查,查到钉螺感染有日本血吸虫(Schistosoma japonicum)、外睾类吸虫(Exorchis)、斜睾类吸虫(Plagiorchis)、侧殖类吸虫(Asymphylodora)和背孔类吸虫(Notocotylus)5种吸虫的幼虫期。其中对生物控制媒介钉螺有利用价值的外睾类吸虫,其钉螺感染率为3.298%(96/2911),终宿主鲶鱼(Parasilurus asoyus)的感染率为99.31%(434/437)、平均每尾鲶鱼的感染强度为115.4条。先用外睾类吸虫虫卵感染钉螺后再感染日本血吸虫毛蚴,切片观察不同时间的实验螺,后侵入的血吸虫幼虫,全部受损害不能发育。
Purpose Although shellfish can be used as an intermediate host for several species of trematodes, in a natural environment in which the individual species of trematodes exist, one body of their common shellfish host usually carries only one stage of trematode larvae. Using this law, we investigated the snails in the schistosomiasis area of Muping, Hanping, Hunan Province, and found that snails infected with Schistosoma japonicum, Exorchis, Plagiorchis, Larval stages of 5 species of trematodes of Asymphylodora and Notocotylus. Among them, the heteroporosis sufferers, which were valuable for the control of snail, were 3.298% (96/2911) and 99.31% (434/437) respectively, with an average of one per tail Catfish infection intensity of 115.4. In the first experiment, the outer snail testis was used to infect snails and then infect Schistosoma japonicum miracidia. The experimental snails at different times were observed, and all the larvae invaded by Schistosoma japonicum were impaired.