Wanzala W, Onyango-Abuje J A, Kang'ethe E K, Zessin K H, Kyule N M, Baumann M P O, Ochanda H, Harrison L J S
Division of Parasitology and Immunology, Department of Zoology, University of Nairobi, Nairobi, Kenya.
Afr Health Sci. 2003 Aug;3(2):68-76.
A study to curb transmission cycle of a zoonotic Taenia cestodiasis between humans and cattle is presented.
To evaluate the reliability of meat inspection procedure in detecting carcasses of cattle with T. saginata cysticercosis.
A total of 55 cattle divided into two groups of artificially (n=30) and naturally (n= 25) infested animals were utilized. Total dissection method was used as a gold standard of validity.
Meat inspection insensitively revealed cysticerci in 12 carcasses in each group compared with 24 and 23 carcasses revealed by total dissection in natural and artificial infestations, respectively. Sites of oncosphere invasion showed great variations with the two groups of cattle. In the predilection sites, most cysticerci were found in the heart, Triceps brachii, tongue and head muscles in that order. However, non-predilection sites (neck and back, hind limbs, chest, pelvic and lumbar regions, lungs and liver) considerably harboured high numbers of cysticerci. Observations indicated that except for the dead, degenerate or calcified cysticerci a careless meat inspector will most likely miss out quite a number of viable cysticerci, which blend the pinkish-red colour of the meat and be passed on for human consumption, becoming the source of bovine cysticercosis.
The results confirmed that in spite of the time and efforts taken by meat inspectors looking for cysticerci at specified predilection sites of carcasses, this method is insensitive and inaccurate. To effectively improve meat inspection procedures, there is need to increase the area and number of predilection sites observed during inspection and vary them according to the nature of the animals, their husbandry history and the target human population for consumption. In addition, other control approaches such as vaccination, chemotherapy and immunodiagnosis should be developed and implemented to complement meat inspection procedures.
本文介绍了一项关于控制人畜共患牛带绦虫病在人和牛之间传播循环的研究。
评估肉类检验程序在检测患有牛带绦虫囊尾蚴病牛尸体方面的可靠性。
总共使用了55头牛，分为人工感染组（n = 30）和自然感染组（n = 25）。全解剖法被用作有效性的金标准。
与全解剖法相比，肉类检验在每组中分别不敏感地检测出12具尸体中的囊尾蚴，而在自然感染和人工感染中，全解剖法分别检测出24具和23具尸体中的囊尾蚴。两组牛六钩蚴侵入部位差异很大。在好发部位，大多数囊尾蚴依次出现在心脏、肱三头肌、舌头和头部肌肉中。然而，非好发部位（颈部和背部、后肢、胸部、骨盆和腰部区域、肺和肝脏）也含有大量囊尾蚴。观察表明，除了死亡、退化或钙化的囊尾蚴外，粗心的肉类检验员很可能会遗漏相当数量的活囊尾蚴，这些囊尾蚴与肉的粉红色融为一体并被用于人类消费，成为牛囊尾蚴病的来源。
结果证实，尽管肉类检验员在尸体的特定好发部位寻找囊尾蚴花费了时间和精力，但这种方法不敏感且不准确。为了有效改进肉类检验程序，有必要增加检验时观察的好发部位的面积和数量，并根据动物的性质、饲养历史和目标消费人群进行调整。此外，应开发和实施其他控制方法，如疫苗接种、化疗和免疫诊断，以补充肉类检验程序。
