Infectious Pancreatic Necrosis Virus: Transmission from Infectious to Susceptible Rainbow Trout Fry

Publisher Website
Google Scholar
Abstract
Fry of rainbow trout Oncorhynchus mykiss were exposed to serotype VR‐299 of infectious pancreatic necrosis virus (IPNV) by using a standardized immersion challenge. In concurrent experiments, fish were monitored for 11 d for excretion of IPNV or monitored for 9 d for excretion and transmission of IPNV to susceptible rainbow trout fry. Immersion‐challenged fish began excreting virus within 2 d after challenge. The rate of IPNV excretion per fish increased steadily from about day 4 to day 8 and then decreased. Virus concentrations in tissues of immersion‐challenged fish increased exponentially. Susceptible fish became infected with IPNV within 4 d after being introduced to immersion‐challenged fish (e.g., 2 d after the challenged fish began excreting virus). By 9 d, 84% of the susceptible fish were infected with IPNV.