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. 1993 Jun;67(6):3019–3026. doi: 10.1128/jvi.67.6.3019-3026.1993

Prolonged replication in the mouse central nervous system of reoviruses isolated from persistently infected cell cultures.

L A Morrison 1, B N Fields 1, T S Dermody 1
PMCID: PMC237638  PMID: 8388486

Abstract

We examined pathogenic characteristics of plaque-purified reoviruses isolated from persistently infected L-cell cultures (PI viruses) after intracranial inoculation into newborn mice. The PI viruses were isolated from independent cultures initiated with high-passage stocks of the wild-type (wt) strain, type 3 Dearing. The virulence of most PI viruses was equivalent to that of the wt strain. However, replication of PI viruses in the central nervous system of infected mice was prolonged to 25 (but not 50) days postinoculation. Thirty-eight percent (n = 186) of mice inoculated with the PI viruses had residual virus detectable in brain tissue 25 days after inoculation, in contrast to only 16% (n = 57) of mice inoculated with wt virus (P = 0.009). Mean residual brain titers were more than 20-fold higher in mice inoculated with PI viruses compared with wt virus (4.3 x 10(4) versus 2.1 x 10(3); P = 0.006). Tropism of PI virus within the brain resembled that of wt virus, and the distribution of PI virus antigen in the brain did not change over time. The extent of necrosis in the brains of mice harboring PI virus 25 days after inoculation was minimal, despite continued presence of high titers of infectious virus. The latter observation resembles the absence of cytopathicity seen in L-cell cultures persistently infected with reovirus. These observations suggest that the interaction of PI viruses with cells can be altered in vivo as well as in cell culture, but virus is eventually cleared from the infected animal.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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