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吸虫对于螺类中间宿主一般都有严格的特异性,有的只限于一个属,有的甚至仅一个种的螺蛳可以作为中间宿主。牛血吸虫(Schistosoma bovis)却是例外,可以在2个属(小泡螺属和扁卷螺属)的螺蛳内发育。许多学者指出牛血吸虫的自然界的中间宿主在地中海盆地是扁卷螺(P. metidjensis),而在其他地区如非洲撒哈拉的南部、尼罗河山谷和近东则是小泡螺属的非洲小泡螺,截形小泡螺、网小泡螺和福氏小泡螺。作者想研究牛血吸虫毛蚴对几种螺类中间宿主的钻入及其发育的能力。牛血吸虫毛蚴由瑞士OF_1小鼠肝脏中的虫卵孵化而来,该小鼠在8周前用来自西班
Trematodes for snail intermediate host generally have strict specificity, and some are limited to one genus, and some even even a species of snail can serve as an intermediate host. The exception is Schistosoma bovis, which develops in the spirochetes of two genera (Sphingobothrix and Sphincter). Many scholars point out that the intermediate hosts of S. bovis in nature are P. metidjensis in the Mediterranean basin, whereas in other regions such as the southern Sahara in Africa, the Nile Valley and the Near East are the African Bubblella snails, Shaped spiraeles, spiraea, and Fusiformis. The authors wanted to study the ability of bovine schistosomes to invade and develop several species of intermediate hosts. Schistosoma japonicum miracidia hatched from eggs in the liver of a Swiss OF 1 mouse that was harvested 8 weeks before