Pigs act as the intermediate hosts of the zoonotic tapeworms Taenia solium and Taenia asiatica, as well as of the non-zoonotic Taenia hydatigena. In Vietnam, human taeniasis and cysticercosis have been reported throughout the country; however, data on porcine cysticercosis are scarce. Our study aimed to estimate the prevalence of Taenia spp. in slaughtered pigs in two districts in Phu Tho, a mountainous province in northern Vietnam from where neurocysticercosis patients commonly originate. The carcasses of 399 pigs from 51 small-scale abattoirs were checked for cysticerci, while tongue, liver, masseter muscles, diaphragm and heart were sliced and examined. Retrieved cysticerci underwent polymerase chain reaction–restriction fragment length polymorphism and sequencing for species confirmation. Blood was also collected to detect antibodies by lentil lectin-purified glycoprotein enzyme-linked immunoelectrotransfer blot (LLGP-EITB) and recombinant T24H antigen (rT24H)-EITB and circulating antigens by B158/B60 Ag-ELISA. In two pigs, T. asiatica cysticerci were found, confirming the presence of the parasite in pigs in Vietnam at a low prevalence (0.5%; 95% exact confidence interval (CI): 0–1.19%). Cysticerci of T. solium were found in none of the pigs, although one serum sample was positive for antibodies in both LLGP-EITB and rT24H-EITB. Furthermore, a high prevalence of T. hydatigena cysticercosis was observed (18.0%; 95% Wilson score CI: 14.6–22.1%). In more than half of the T. hydatigena-positive pigs, circulating antigens were detected by Ag-ELISA, confirming that this test cannot be used to diagnose T. solium cysticercosis in this region. Finally, Spirometra erinaceieuropaei was found in one pig liver. It is the first record of this zoonotic cestode species in pigs in Vietnam. Overall, the findings confirmed the complex epidemiology of Taenia spp. in pigs in Vietnam.

中文翻译：

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越南北部富寿省屠宰场猪身上出现带绦虫

猪是人畜共患绦虫的中间宿主猪带绦虫和亚洲带绦虫，以及非人畜共患病的绦虫。在越南，全国各地都有人带绦虫病和囊尾蚴病的报告；然而，关于猪囊尾蚴病的数据很少。我们的研究旨在估计绦虫spp. 在越南北部山区省份富寿的两个地区屠宰的猪中，神经囊尾蚴病患者通常来自这里。对来自 51 个小型屠宰场的 399 头猪的胴体进行囊尾蚴检查，并对舌、肝、咬肌、横膈膜和心脏进行切片检查。检索到的囊尾蚴经过聚合酶链反应-限制性片段长度多态性和测序以确认物种。还收集血液以通过扁豆凝集素纯化的糖蛋白酶联免疫电转移印迹 (LLGP-EITB) 和重组 T24H 抗原 (rT24H)-EITB 检测抗体，并通过 B158/B60 Ag-ELISA 检测循环抗原。在两只猪中，T. asiatica发现了囊尾蚴，证实了越南猪中寄生虫的存在率很低（0.5%；95% 精确置信区间（CI）：0-1.19%）。囊尾蚴T. solium尽管一份血清样本的 LLGP-EITB 和 rT24H-EITB 抗体均呈阳性，但在所有猪中均未发现。此外，高发病率T. hydatigena观察到囊尾蚴病（18.0%；95% Wilson 评分 CI：14.6-22.1%）。在超过一半的T. hydatigena-阳性猪，通过Ag-ELISA检测循环抗原，证实该测试不能用于诊断T. solium该地区的囊尾蚴病。最后，紫锥菊在一只猪肝中发现。这是越南猪中这种人畜共患绦虫的首次记录。总体而言，研究结果证实了复杂的流行病学绦虫spp. 在越南的猪中。