Studies on infectious pancreatic necrosis virus interactions with RTG-2 and FHM cells: selection of a variant virus-type in FHM cells.
Evidence is presented that adaptation of IPN virus (strain VR 299) to FHM cells entails the selection of a variant virus type that differs significantly from the parental, and most representative, RTG-2 virus type in being able to adsorb efficiently to, and form plaques in, FHM cells. The plaque titre of FHM-non-adapted virus stocks (RTG-2 viruses) was reduced by at least 99-99% in FHM cells, while FHM-adapted virus stocks (FHM viruses) produced plaques at equally high titres in both RTG-2 and FHM cells. FHM viruses and RTG-2 viruses differed also in their behavior in RTG-2 cells in respect to plaque size distribution and growth characteristics, but both virus-types were shown to be morphologically identical, and no significant difference in reactivity against specific antiserum could be detected. Analysis of virus in individual RTG-2 plaque isolates or plaque progeny shows that a mutation of relatively high frequency (10(-4) to 10(-5))robably causes the ability to infect the FHM cells efficiently. Only these mutant virus-types were found in FHM plaque isolates.
D000818:Animals; D002460:Cell Line; D003530:Cyprinidae; D014644:Genetic Variation; D006066:Gonads; D012087:Reoviridae / Q000254:growth & development*; D012487:Salmonidae; D014337:Trout; D010948:Viral Plaque Assay; D014779:Virus Replication