The attenuation phenotype conferred by the M gene of the influenza A/Ann Arbor/6/60 cold-adapted virus (H2N2) on the A/Korea/82 (H3N2) reassortant virus results from a gene constellation effect.

Abstract excerpt

A single gene reassortant (SGR) virus that derived its M gene from the attenuated influenza A/Ann Arbor/6/60 cold-adapted (CA) donor virus and the remaining genes from the A/Korea/82 (H3N2) wild type (WT) virus (designated A/Korea/82 CA M-SGR) was previously shown to be attenuated in mice, hamsters, ferrets, and humans. The attenuation (ATT) phenotype of this SGR virus could result directly from an altered...

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