1887

Abstract

SUMMARY

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 behaviour 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 to 10) probably causes the ability to infect the FHM cells efficiently. Only these mutant virus-types were found in FHM plaque isolates.

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1975-07-01
2024-05-04
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