Alarmingly, it was subsequently found to be present in an increasing number of trout populations in the western USA, likely by a combination of improved surveillance activities and the shipment of infected eggs to new locations.
Analysis of isolates, obtained from seven species of trout, reared in various geographic locations in the western USA, revealed that there was little diversion between the virus, suggesting an epidemiological link.
The Hepatitis E Virus from fish has been used as a surrogate infection model. It would be really remarkable if the recently discovered White Sucker Hepatitis B Virus (WSHBV) offered the same opportunities.
|[Suggested classification of the family Hepaviridae]|
 Batts et al: A novel member of the family Hepeviridae from cutthroat trout (Oncorhynchus clarkii) in Journal of Virology – 2011
 Debing et al: Cutthroat trout virus as a surrogate in vitro infection model for testing inhibitors of hepatitis E virus replication in Antiviral Research – 2013
 Smith et al: Consensus proposals for classification of the family Hepeviridae in Journal of General Virology - 2014