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Resistance to Pseudorabies Virus with Enhanced Interferon Production and Natural Killer Cell Activity in Mice Treated with Serum Thymic Factor

Susceptibility to pseudorabies virus (PRV) infection in mice, which were continuously depleted of natural killer (NK) cell activity by injection of anti‐asialo GM1, was examined. Effects of serum thymic factor (FTS) on susceptibility of mice to PRV were also investigated. In mice with depleted NK cell activity, the mortality of PRV‐infected mice was markedly high, whereas that of FTS‐pretreated mice was significantly lower than the controls. Reduced susceptibility to PRV was demonstrated in mice treated with anti‐asialo GM1 antisera before the PRV infection. Such a reduced susceptibility was not observed in mice inoculated with the antisera on day 1 post‐infection (PI). To analyze the FTS‐induced resistance to PRV infection, NK cell activity, macrophage activity, and interferon (IFN) productions were studied. Interferon production and NK cell activity were enhanced in the FTS‐pretreated mice, suggesting that interferon may play an important role in this FTS‐induced resistance to PRV infection.