Van Tuyen Nguyen, Thi Kim Lan Nguyen, Doanh Pham Ngoc
Dien Bien Technical Economic College, Dien Bien Province, Vietnam.
Thai Nguyen University of Agriculture and Forestry, Vietnam.
Folia Parasitol (Praha). 2019 Aug 19;66:2019.010. doi: 10.14411/fp.2019.010.
Gnathostomes are of interest because of their unique appearance and medical importance. Among 13 valid species of the genus Gnathostoma Owen, 1836 (Nematoda: Spirurida), two species, G. doloresi Tubangui, 1925 and G. hispidum Fedtschenko, 1872, are parasites of pigs but their larvae can infect humans to cause gnathostomiasis. In this study, we collected adults of Gnathostoma sp. from the stomach of domestic pigs (Sus scrofa domesticus Linnaeus) from Dien Bien Province, northern Vietnam. Morphologically, nematodes found here are most similar to G. doloresi with a slight difference in the spicules of males. In contrast, they are genetically distinct from G. doloresi and other species of Gnathostoma in both ITS2 and cox1 sequences. The findings of the present study suggest that specimens of Gnathostoma sp. found in Dien Bien are likely a new species and emphasise the need of further studies on the taxonomy and phylogenetic relationship of species of Gnathostoma. Special attention should also be paid to swine and human gnathostomiasis in Dien Bien Province, Vietnam and the neighbouring areas of China and Laos.
由于其独特的外观和医学重要性，有颌类动物备受关注。在颚口线虫属（Gnathostoma Owen，1836年，线虫纲：旋尾目）的13个有效物种中，有两个物种，即1925年的多氏颚口线虫（G. doloresi Tubangui）和1872年的刚刺颚口线虫（G. hispidum Fedtschenko）是猪的寄生虫，但其幼虫可感染人类导致颚口线虫病。在本研究中，我们从越南北部奠边省的家猪（Sus scrofa domesticus Linnaeus）胃中采集了颚口线虫属成虫。从形态学上看，这里发现的线虫与多氏颚口线虫最为相似，只是雄虫交合刺略有差异。相比之下，在ITS2和cox1序列方面，它们在基因上与多氏颚口线虫及其他颚口线虫属物种不同。本研究结果表明，在奠边发现的颚口线虫属标本可能是一个新物种，并强调需要进一步研究颚口线虫属物种的分类学和系统发育关系。越南奠边省以及中国和老挝的邻近地区的猪和人类颚口线虫病也应予以特别关注。
