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2009-2010 influenza season surveillance summary
  • Published Date:
    11/3/2011
  • Language:
    English
Filetype[PDF - 272.31 KB]


Details:
  • Corporate Authors:
    National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.
  • Description:
    This summary includes information on influenza activity and virus circulation from April 19, 2009 to October 2, 2010. This time period includes both the Spring and Fall waves of the 2009 influenza A (H1N1) pandemic as well as the remainder of the 2009-10 influenza season.

    From April 2009 to October 2010, 2009 influenza A (H1N1) viruses were almost exclusively identified with few seasonal influenza viruses detected during this time. 2009 influenza A (H1N1) activity peaked in October, and low levels of influenza activity were detected during the traditional winter influenza season. Influenza activity peaked in late-October and was associated with higher pediatric mortality and higher rates of hospitalizations in children and young adults than in previous seasons. The proportion of visits to health-care providers for influenza-like illness (ILI), as reported in the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), was the highest since ILI surveillance began in 1997 in its current form. This report summarizes influenza activity in the United States during both waves of the 2009 influenza A (H1N1) pandemic and the 2009--10 influenza season (April 19, 2009—October 2, 2010).

    Publication date from document properties.

    10-11 Season Summary.pdf

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