Eom K S, Rim H J, Geerts S
Department of Parasitology, College of Medicine, Chungbuk National University, Chongju, Korea.
Kisaengchunghak Chapchi. 1992 Dec;30(4):269-75. doi: 10.3347/kjp.1992.30.4.269.
Asian Taenia saginata, tentatively called Taenia saginata taiwanensis, has been described to be infected in its metacestode stage only in the liver of intermediate host animals. Experimentally, however, we found that the metacestodes of the Asian Taenia saginata are also infected in other viscera than the liver of pigs (Landrace-Duroc-Hampshire) 4 days to 4 months postinoculation (PI). Viscerotropism of cysticercosis was apparent because a majority (70.7%) of the non-calcified cysticerci were found in the livers while a minority were found in extrahepatic organs such as the omentum (19.2%), lungs (8.1%) and serosa of colon (2.0%). When experimentally infected to cattle, Asian T. saginata cysticerci were also observed calcified in the livers. On the other hand, classical Taenia saginata metacestodes infected the muscles and viscera of the Holstein-Friesian cattle whereas no infection was observed in experimental pigs. Extrahepatic metacestodes of Asian T. saginata, which were obtained from an experimental pig were confirmed to be infective to a male volunteer. This extrahepatic viscerotropism of Asian T. saginata metacestodes in experimental pigs explains well the transmission modes of Asian T. saginata among people considering the eating habits.
亚洲牛带绦虫，暂称为台湾牛带绦虫，据描述仅在中间宿主动物的肝脏中处于其幼虫阶段时被感染。然而，通过实验我们发现，亚洲牛带绦虫的幼虫在接种后4天至4个月，除猪（长白 - 杜洛克 - 汉普夏）的肝脏外，在其他内脏中也会被感染。囊尾蚴病的内脏嗜性很明显，因为大多数（70.7%）未钙化的囊尾蚴发现于肝脏，而少数发现于肝外器官，如大网膜（19.2%）、肺（8.1%）和结肠浆膜（2.0%）。当实验性感染牛时，亚洲牛带绦虫的囊尾蚴在肝脏中也会出现钙化。另一方面，经典牛带绦虫的幼虫感染荷斯坦 - 弗里生牛的肌肉和内脏，而在实验猪中未观察到感染。从实验猪获得的亚洲牛带绦虫肝外幼虫被证实对一名男性志愿者具有感染性。考虑到饮食习惯，亚洲牛带绦虫在实验猪中的这种肝外内脏嗜性很好地解释了亚洲牛带绦虫在人群中的传播方式。
