Case Report: Viral Infectious Pancreatic Necrosis in Farmed Rainbow Trout from Mexico

This case report provides pathologic and confirmatory diagnostic documentation of the first reported clinical epizootic of infectious pancreatic necrosis (IPN) in farmed rainbow trout Oncorhynchus mykiss from central Mexico. Both the gross and microscopic pathology were consistent with IPN. A virus was isolated in cell culture with the cytopathic effect typical of the IPN virus (IPNV). Positive identification as IPNV was achieved by means of an IPNV-specific indirect fluorescent antibody test and reverse transcription-polymerase chain reaction. Further genotyping identified this isolate as the Buhl strain of IPNV, which is a member of the West Buxton (A1) serotype of aquatic birnavirus serogroup A.