FluView: 2011–2012 Influenza Season Week 47 Ending November 26, 2011
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FluView: 2011–2012 Influenza Season Week 47 Ending November 26, 2011

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

    Synopsis: During week 47 (November 20-26, 2011), influenza activity remained low in the United States.

    • U.S. Virologic Surveillance: Of the 2,130 specimens tested by U.S. World Health

    • Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories and reported to CDC/Influenza Division, 40 (1.9%) were positive for influenza.

    • Pneumonia and Influenza (P&I) Mortality Surveillance: The proportion of deaths

    • attributed to P&I was below the epidemic threshold.

    • Influenza-associated Pediatric Mortality: Two influenza-associated pediatric deaths were reported. These deaths occurred during the 2010-11 influenza season.

    • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.4%, which is below the national baseline of 2.4%. All 10 regions reported ILI below region-specific baseline levels. All 50 states and New York City experienced minimal ILI activity and the District of Columbia had insufficient data.

    • Geographic Spread of Influenza: The geographic spread of influenza in one state was reported as local; the District of Columbia, Guam, and 29 states reported sporadic activity; the U.S. Virgin Islands and 21 states reported no influenza activity, and Puerto Rico did not report.


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