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Retroviral interference is manifested in chronically infected cells as a decrease in susceptibility to superinfection by virions using the same cellular receptor. The pattern of interference reflects the cellular receptor specificity of the chronically infecting retrovirus and is mediated by the viral envelope glycoprotein, which is postulated to bind competitively all cellular receptors available for viral attachment. We established retroviral interference in mice by infecting them with Friend murine leukemia virus and them measured susceptibility to superinfection by challenging the mice with the erythroproliferative spleen focus-forming virus. Infection of approximately 10% of nucleated splenocytes rendered mice 1% as susceptible to superinfection as untreated controls. The magnitude of this effect was the same in mice incapable of producing neutralizing antibodies or genetically deficient for T cells. The results indicated that retroviral interference in vivo was established rapidly with infection of a fraction of the host cell population and that the decrease in susceptibility to superinfection occurred without a detectable contribution by immunologic factors.

Interference established in mice by infection with Friend murine leukemia virus