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The D222N hemagglutinin (HA) mutation within the receptor-binding site was detected with higher frequencies in severe cases of 2009 pandemic H1N1 (pdmH1N1) infections. The impact of this mutation was investigated in vitro and in vivo using recombinant viruses. The recombinant D222N virus grew to significantly lower viral titers than the WT in A549 but not in MDCK cells. A dose-dependent glycan array...
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