Q Please read and summarize the following article: Antigenic and Genetic Characteristics of Swine-Origin 2009 A(H1N1) Influenza Viruses Circulating in Humans Rebecca J. Garten Published Online 22 May 2009 Science 10 July 2009: Vol. 325 no. 5937 pp. 197-201 DOI: 10.1126/science.1176225
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