National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.

During the 2012–13 influenza season in the United States, influenza activity increased through November and December before peaking in late December. Influenza A (H3N2) viruses predominated overall, but influenza B viruses and, to a lesser extent, 2009 influenza A (H1N1) (2009 H1N1) viruses also were reported in the United States. This influenza season was moderately severe, with a higher percentage of outpatient visits for influenza-like illness (ILI), higher rates of hospitalization, and more reported deaths attributed to pneumonia and influenza compared with recent years. Date from document properties

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