Abstract
The 2009 influenza pandemic brought home the importance of vaccines in infection control. Previously, we demonstrated an M2 cytoplasmic tail mutant H5N1 influenza virus could serve as a live-attenuated vaccine. Here, we adapted that strategy, generating a mutant pandemic (H1N1) 2009 virus that grew well in cell culture, but replicated less well in mice than did wild-type virus. The mutant virus elicited sterile immunity in mice, completely protecting them from challenge with a pandemic (H1N1) 2009 virus. Our results indicate that M2 cytoplasmic tail mutants are suitable for live-attenuated vaccines against pandemic viruses.
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