Greer G J, Kitikoon V, Lohachit C
Division of Parasitology, Institute for Medical Research, Kuala Lumpur, Malaysia.
J Parasitol. 1989 Feb;75(1):98-101.
Schistosoma sinensium Pao, 1959, was first isolated from an unidentified snail in Szechuan Province, China, and was described on the basis of adult worms and eggs recovered from experimentally infected mice. We discovered snails, Tricula bollingi Davis, and rodents, Rattus rattus (L.) and Crocidura attenuata Milne-Edwards, infected with S. sinensium near Fang in northwest Thailand. Adult worms were recovered from small veins immediately adjacent to the small intestine. Eggs first appeared in the feces of experimentally infected mice at 25 days postinfection. Cercariae first emerged from experimentally infected T. bollingi at 40 days postinfection. Shortly after emerging, cercariae were found at the water surface, their bodies flat against the meniscus and tails hanging free in the water column. Our morphometric results for adults and eggs from naturally infected hosts agree well with those presented in the original description. The occurrence of a lateral spine on the egg of this Asian schistosome has created some confusion as to the affinities of S. sinensium. A comparison of 8 character states, including snail hosts, cercarial behavior, geographical distribution, and morphology of life cycle stages, indicates that S. sinensium is more closely related to S. japonicum Katsurada than it is to S. mansoni Sambon.
中华血吸虫（Pao，1959年）最初是在中国四川省从一种未鉴定的螺类中分离出来的，并根据从实验感染小鼠体内获得的成虫和虫卵进行了描述。我们在泰国西北部芳附近发现感染了中华血吸虫的螺蛳——博氏拟钉螺（Davis）以及啮齿动物——褐家鼠（L.）和长尾麝鼩（Milne-Edwards）。成虫是从小肠紧邻的小静脉中获取的。虫卵在感染后25天首次出现在实验感染小鼠的粪便中。尾蚴在感染后40天首次从实验感染的博氏拟钉螺中逸出。尾蚴逸出后不久，就会在水面被发现，它们的身体平贴在水面，尾巴在水柱中自由垂挂。我们对自然感染宿主的成虫和虫卵的形态测量结果与原始描述中的结果非常吻合。这种亚洲血吸虫虫卵上侧棘的出现，使得中华血吸虫的亲缘关系存在一些混淆。对包括螺类宿主、尾蚴行为、地理分布和生命周期各阶段形态在内的8个性状状态进行比较表明，中华血吸虫与日本血吸虫（Katsurada）的亲缘关系比与曼氏血吸虫（Sambon）的亲缘关系更近。
