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2011-2012 influenza season surveillance summary
  • Published Date:
  • Language:
Filetype[PDF - 287.20 KB]

  • Corporate Authors:
    National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.
  • Series:
    FluView : 2011-2012 Influenza Season ; 2011-2012 influenza season surveillance summary
  • Document Type:
  • Description:
    During the 2011-2012 influenza season (October 2, 2011 to September 29, 2012), influenza activity

    first began to increase in the southern and southeastern states in November, and peaked nationally

    in late February and early March. Compared with the previous season (2010-11), there were lower

    rates of hospitalization observed in all age groups, and the percentage of outpatient visits for

    influenza-like illness (ILI) was lower than during the 2010-11 influenza season. Nationally, influenza

    A (H3) was the predominant virus throughout the season, although influenza A 2009 H1N1 and

    influenza B also circulated. The predominant virus varied by U.S. Department of Health and

    Human Service (HHS) region and also by week.

    Publication date from document properties.


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