Quantitative Veterinary Epidemiology Group, Wageningen Institute of Animal Sciences, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands.
Parasitol Res. 2013 Jul;112(7):2759-62. doi: 10.1007/s00436-013-3408-1. Epub 2013 Apr 9.
Heterophyidae are small intestinal trematodes that infect vertebrates worldwide. Common carp (Cyprinus carpio) is one of the most preferred freshwater fish species by consumers in Asia, the region where fish-borne trematodes like Heterophyidae are most prevalent. How long Heterophyidae survive in common carp is unknown. The objective of this study was to quantify survival of Heterophyidae in common carp after experimental exposure. Fish of 0.18 g were either used as controls or exposed to 250 heterophyid cercaria for 24 h. Control fish did not become infected. Percentage infection of exposed fish at 0-2 (n = 53), >2-10 (n = 15), >10-20 (n = 11), and >20-27 (n = 33) weeks post exposure was 98, 80, 100, and 100 % respectively. The number of metacercaria per fish did not significantly decrease (P = 0.19) during 27 weeks after exposure: exp [3.6200-0.0193 × weeks post exposure]. All developed metacercaria were identified as Haplorchis spp. It was concluded that Heterophyidae may persist in carp for a long time, implying that harvestable carp are a risk to human health.
异形科是寄生在全世界脊椎动物小肠内的小型吸虫。鲤鱼（Cyprinus carpio）是亚洲消费者最喜爱的淡水鱼类之一，而亚洲正是异形科等鱼类寄生虫最为流行的地区。异形科在鲤鱼体内能存活多久尚不清楚。本研究旨在定量研究实验感染后异形科在鲤鱼体内的存活情况。将 0.18 克重的鲤鱼作为对照或暴露于 250 个异形科尾蚴 24 小时。对照组鱼未被感染。感染率在暴露后 0-2 周（n = 53）、>2-10 周（n = 15）、>10-20 周（n = 11）和>20-27 周（n = 33）的分别为 98%、80%、100%和 100%。暴露后 27 周内，每尾鱼的囊蚴数量没有显著减少（P = 0.19）：暴露后 [3.6200-0.0193 × 周数]。所有发育成熟的囊蚴均被鉴定为片形科吸虫。研究结论为异形科可能在鲤鱼体内长期存在，这意味着可收获的鲤鱼可能对人类健康构成威胁。
