猪带绦虫囊尾蚴在实验感染家猪体内的分布及发育

An Observation on the Distribution and Development of Cysticercus cellulosae in Pigs Infected with Taenia solium Eggs

目的:探讨猪带绦虫卵实验感染中间宿主家猪后,不同时期囊尾蚴在家猪体内各个器官的分布及发育情况。方法:以猪带绦虫卵实验感染20～30日龄的家猪4头,在感染后不同时间宰杀感染家猪,肉眼观察囊尾蚴在家猪体内各个器官上的分布数量及大小。结果:感染后第40天剖杀家猪,多数脏器和组织,如肝脏、心脏、脑、肺、舌、四肢及驱干肌肉内有未成熟囊尾蚴寄生;感染第80天时各器官及组织内囊尾蚴先后发育成熟,囊尾蚴随感染时间增加而逐渐增大;感染第120天或第150天时,除肝脏外各器官及组织内仍可见大量成熟囊尾蚴,且无死亡和钙化现象,而此时肝脏内囊尾蚴几乎全部死亡和钙化;在实验全过程中,肾脏和脾脏未见囊尾蚴寄生。结论:猪囊尾蚴除在四肢肌肉等主要寄生部位生长外,还可以在猪的肝脏内寄生,但是随感染时间增加会逐渐死亡和钙化,表明在当前生猪快速出栏养殖过程中,猪肝脏无囊尾蚴寄生时,其余主要寄生部位如四肢和驱干肌肉内仍有囊尾蚴寄生,提示在生猪检验检疫工作中应予以重视。

Objective： To study the distribution and development process of Cysticercus cellulosae in organs of pigs infected with Taenia solium. Methods： Four pigs of 20 - 30 day-old were infected with T. solium eggs at a dose of 8×10^4 each pig. The pigs were reared for different periods of time after the infection before sacrificed and the locations, sizes, and quantity of Cysticercus cellulosae in pigs were observed. Results： Immature cysticerci were found in liver, heart, brain, lungs, tongue, and muscles of limbs and body on the 40^th day. On the 80^th day, cysticerci were bigger and matured. On the 120^th and 150^th days, large quantity of mature and alive cysticerci were found in all infected organs except liver in which the cysticerci gradually died. Cysticerci were not found to grow in kidney or spleen all the time. Conclusions： Cysticercus ellulosae could live in liver not only in muscle as we thought before. During the fast process of sending pigs to go into the market, it should be aware that even though cysticerci are not found in liver, they may be still in suitable locations of muscles, and more attention should be paid to pig quarantine.