Seasonal H1N1 2007 influenza virus infection is associated with elevated preaexposure antibody titers to the 2009 pandemic influenza A (H1N1) virus von Lemaitre, M, LeruezaVille, M, De Lamballerie, XN, Salez, N, Garrone, P, Fluckiger, AaC, Klatzmann, D, Carrat, F

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