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FluView : 2011-2012 Influenza Season ; Week 50 ending December 17, 2011
  • Published Date:
    December 23, 2011
  • Language:
    English
Filetype[PDF-480.68 KB]


Details:
  • Corporate Authors:
    National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.
  • Description:
    All data are preliminary and may change as more reports are received.

    Synopsis: During week 50 (December 11-17, 2011), influenza activity remained low in the United States.

    • U.S. Virologic Surveillance: Of the 2,993 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, 64 (2.1%) were positive for influenza.

    • Novel influenza A Virus: Two human infections with novel influenza A virus were reported.

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

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

    • Influenza-associated Pediatric Mortality: No influenza-associated pediatric deaths were reported.

    • 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. One state experienced moderate ILI activity, New York City experienced low ILI activity, 49 states experienced minimal ILI activity, and the District of Columbia had insufficient data.

    • Geographic Spread of Influenza: The geographic spread of influenza in two states was reported as local; Guam, Puerto Rico, and 37 states reported sporadic activity, and the District of Columbia, the U.S. Virgin Islands, and 11 states reported no influenza activity.

    External_F1150.pdf

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