Final Estimates for 2009–10 Seasonal Influenza and Influenza A (H1N1) 2009 Monovalent Vaccination Coverage – U.S., August, 2009 through May, 2010

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Because the novel influenza A (H1N1) virus [2009 influenza A (H1N1)] was identified in April 2009, two separate influenza vaccines were distributed in the United States in 2009–2010: a seasonal vaccine and an influenza A (H1N1) 2009 monovalent vaccine (2009 H1N1 vaccine).