Mutation in Hemagglutinin Antigenic Sites in Influenza A pH1N1 Viruses from 2015-2019 in the United States Mountain West, Europe, and the Northern Hemisphere.

Although positions 159 and 233 had highly significant p -values, the statistics were likely at least somewhat skewed due to the presence of low numbers of residues (<3) in at least one of the groups of sequences that were compared.

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