Vennerström Pia, Välimäki Elina, Hautaniemi Maria, Lyytikäinen Tapani, Kapiainen Suvi, Vidgren Gabriele, Virtala Anna-Maija
Production Animal and Wildlife Health Research Unit, Finnish Food Safety Authority, 00790 Helsinki, Finland.
Dis Aquat Organ. 2018 Nov 20;131(3):187-197. doi: 10.3354/dao03301.
Wild fish were suspected to be the source of reinfection by viral haemorrhagic septicaemia virus (VHSV) in Finnish brackish water rainbow trout farms located in a restriction zone regarding viral haemorrhagic septicaemia (VHS) comprising the entire Province of Åland, Baltic Sea, in the 2000s. Altogether, 1636 wild fish of 17 different species living in the vicinity of infected fish farms were screened for VHSV during the years 2005-2008. Additionally, 2 uninfected wild fish species as well as farmed whitefish were introduced into a VHS-positive fish farm to test whether they became infected by VHSV from the clinically diseased rainbow trout. Wild fish did not test positive for VHSV on any occasion. In contrast, whitefish introduced to a VHS-positive farm were infected with VHSV genotype Id and started to replicate the virus for a short time during the trial. Whitefish are farmed together with, or in the vicinity of, farmed rainbow trout in the study area and, according to this study, are a possible source of the recurring infection in the restriction area. A sprivivirus was isolated from all fish species in the infection trial without causing mortality in the test groups.
在21世纪，芬兰咸水虹鳟鱼养殖场疑似通过病毒性出血性败血症病毒（VHSV）再次感染，这些养殖场位于波罗的海奥兰省整个地区的病毒性出血性败血症（VHS）限制区内。2005年至2008年期间，对生活在受感染养鱼场附近的17种不同野生鱼类的1636条野生鱼进行了VHSV筛查。此外，将2种未感染的野生鱼类以及养殖的白鲑引入一个VHS呈阳性的养鱼场，以测试它们是否会被临床患病的虹鳟鱼感染VHSV。野生鱼在任何情况下都未检测出VHSV呈阳性。相比之下，引入VHS呈阳性养鱼场的白鲑感染了VHSV基因型Id，并在试验期间短时间内开始复制病毒。在研究区域，白鲑与养殖的虹鳟鱼一起养殖或在其附近养殖，根据这项研究，白鲑是限制区内反复感染的可能来源。在感染试验中，从所有鱼类物种中分离出一种sprivivirus，试验组未出现死亡情况。
