Hospitalized Patients with 2009 H1N1 Influenza in the United States, April–June 2009

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Abstract
During the spring of 2009, a pandemic influenza A (H1N1) virus emerged and spread globally. We describe the clinical characteristics of patients who were hospitalized with 2009 H1N1 influenza in the United States from April 2009 to mid-June 2009.