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. 1985 Aug;55(2):366–373. doi: 10.1128/jvi.55.2.366-373.1985

Defective interfering virus particles modulate virulence.

D R Cave, F M Hendrickson, A S Huang
PMCID: PMC254942  PMID: 2991562

Abstract

To determine whether defective interfering (DI) particles modulate virulence by initiating a cyclic pattern of virus growth in vivo, adult mice were infected with vesicular stomatitis virus (VSV), both with and without DI particles. A total of 184 mice divided into groups were inoculated intranasally. A majority of mice inoculated only with standard VSV developed paralysis, most of them between days 7 and 9. The addition of DI particles altered the development of paralysis in several ways. When there was significant protection, a few still became paralyzed on days 7 and 9. When overall mortality was unaffected or even slightly increased, the majority of mice became paralyzed between days 7 and 9 as well. Protection could not be predicted based on a single ratio of standard VSV to DI particles or on the absolute amount of DI particles inoculated. Infectious virus recovered from mouse brains at the time of paralysis and incipient death showed considerable variation, although the titer in a majority of the animals was between 10(5) and 10(7) PFU/ml. When the brains of these paralyzed mice were examined for hybridizable VSV RNA, the detection of standard VSV RNA correlated well with infectivity. The amount of DI RNA in the coinfected mice was more variable and independent of the amount of 40S RNA, although DI RNA was usually found when standard RNA was present. Survivors examined between days 14 and 21 did not contain infectious virus or any detectable viral RNA in their brains. Because these results were consistent with the hypothesis of viral cycling in vivo, rather than a gradual accumulation of total infectious virus, mice were coinfected with 10(8) PFU of standard VSV and 10(5) PFU equivalents of DI particles and sacrificed daily thereafter, irrespective of whether they developed paralysis. Infectivity measurements indicated a reproducible cycling pattern of VSV in the mouse brains with a periodicity of about 5 days. This cycling and the detection of DI RNA in brains several days after intranasal inoculation suggest that there is a dynamic continuous interaction between standard VSV and its DI particle beyond the initial site of replication as the virus population spreads into the host animal. Such cycling of virus production before the full development of specific immune responses from the host may have important implications for viral diagnostics and disease transmission.

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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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