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Most mice which have recovered from influenza virus infection are immune to reinfection with the same influenza virus. This immunity could be abrogated by the intranasal instillation of anti-immunoglobulin A (anti-IgA) but not of anti-IgG or anti-IgM antiserum. Thus, IgA is the major, if not the sole, mediator of nasal immunity to influenza virus in immunocompetent mice.
Renegar et al. (Mon,) studied this question.
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