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        FluView: A Weekly Influenza Surveillance Report Prepared by the Influenza Division

        2010-2011 Influenza Season Week 23 ending June 11, 2011


        All data are preliminary and may change as more reports are received.

        U.S. Virologic Surveillance:

        WHO and NREVSS collaborating laboratories located in all 50 states and Washington, D.C. report to CDC the number of respiratory specimens tested for influenza and the number positive by influenza type and subtype.

        INFLUENZA Virus Isolated
        View Chart Data | View Full Screen | View PowerPoint Presentation


        Pneumonia and Influenza (P&I) Mortality Surveillance

        During week 23, 7.2% of all deaths reported through the 122-Cities Mortality Reporting System were due to P&I. This percentage was above the epidemic threshold of 7.0% for week 23.

        Pneumonia And Influenza Mortality
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        Influenza-Associated Pediatric Mortality

        Two influenza-associated pediatric deaths were reported to CDC during week 23. Both of these deaths were associated with a 2009 influenza A (H1N1) virus.

        This season, 108 laboratory-confirmed influenza-associated pediatric deaths from 33 states, Chicago, and New York City have been reported. Forty-one of the 108 deaths reported were associated with influenza B viruses; 29 were associated with 2009 influenza A (H1N1) viruses; 18 deaths reported were associated with influenza A (H3N2) viruses, and 20 were associated with an influenza A virus for which the subtype was not determined.


        Influenza-Associated Pediatric Mortality
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        Outpatient Illness Surveillance:

        Nationwide during week 23, 0.7% of patient visits reported through the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet) were due to influenza-like illness (ILI). This percentage is below the national baseline of 2.5%.

        national levels of ILI and ARI
        View Chart Data | View Full Screen | View PowerPoint Presentation





        A description of surveillance methods is available at: http://www.cy118119.com/flu/weekly/overview.htm

         
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