Department of Parasitology, Faculty of Veterinary Medicines, Kasetsart University, Bangkok, Thailand.
Vet Parasitol. 2013 Nov 15;198(1-2):230-4. doi: 10.1016/j.vetpar.2013.08.008. Epub 2013 Aug 21.
Fish-borne zoonotic trematode (FZT) infections affect the health of more than 18 million people around the world, particularly in Asian countries. Nile tilapia (Oreochromis niloticus) is a white meat fish that has an increasing national and international market. The objective of this study was to determine the prevalence of FZT metacercarial infections in Nile tilapia from cage and pond aquaculture systems and in wild-caught fish from Suphan Buri, Nakhon Pathom and Chachoengsao provinces, Thailand. Fish were collected from four cages in Suphan Buri and four ponds in Nakhon Pathom provinces between September-October 2011 and April-May 2012 and wild-caught fish were collected in May 2012. All fish were examined for metacercariae by a pepsin digestion and metacercariae identified using morphological and molecular methods. During the first sampling of tilapia the prevalence of metacercariae in cage culture fish were 2.5% and 10% in pond culture fish. During the second sampling, metacercariae was found in 2.0% of tilapia from cage and none from the ponds. Of the 150 wild-caught fish, a total of 80 (53.3%) were found to be infected with metacercariae, mostly the zoonotic species Stellantchasmus falcatus, Haplorchis pumilio and Procerovum varium. The results revealed a low risk for FZT in Nile tilapia cultured in cage and pond aquaculture systems. However, the high prevalence of FZT in wild-caught fish indicates a high potential for spillover from wild reservoir hosts and underscores the need for vigilance and good management practices by the aquaculture sector.
鱼类源性人畜共患吸虫（FZT）感染影响着全球超过 1800 万人的健康，尤其在亚洲国家更为严重。尼罗罗非鱼（Oreochromis niloticus）是一种白肉鱼类，在国内外市场的需求日益增长。本研究旨在调查泰国苏潘布里、那空巴吞和差春骚府笼养和池塘养殖系统以及野生捕获的尼罗罗非鱼中 FZT 幼虫感染的流行情况。2011 年 9 月至 10 月和 2012 年 4 月至 5 月期间，从苏潘布里的四个笼子和那空巴吞的四个池塘中采集鱼类，2012 年 5 月采集野生鱼类。采用胃蛋白酶消化法检查所有鱼类的幼虫，通过形态学和分子方法鉴定幼虫。在第一次罗非鱼采样中，笼养鱼幼虫感染率为 2.5%，池塘养殖鱼幼虫感染率为 10%。第二次采样中，笼养鱼幼虫感染率为 2.0%，池塘养殖鱼幼虫感染率为 0。在 150 条野生捕获的鱼中，共有 80 条（53.3%）被发现感染幼虫，主要为食源性种 Stellantchasmus falcatus、Haplorchis pumilio 和 Procerovum varium。结果表明，笼养和池塘养殖系统中的尼罗罗非鱼感染 FZT 的风险较低。然而，野生捕获鱼类中 FZT 的高感染率表明，野生宿主的溢出风险较高，这突显了水产养殖部门需要保持警惕并采取良好的管理措施。
