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FluView : 2011-2012 Influenza Season ; Week 11 ending March 17, 2012
  • Published Date:
    March 23, 2012
  • Language:
    English
Filetype[PDF - 538.15 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 11 (March 11-17, 2012), influenza activity was elevated in some areas of the United States, but remained relatively low nationally.

    • U.S. Virologic Surveillance: Of the 5,088 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, 1,353 (26.6%) 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: Three influenza-associated pediatric deaths were reported and were associated with 2009 H1N1 (2) and influenza B (1) viruses.

    • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 2.4%, which is at the national baseline of 2.4%. Regions 5, 6, 7, 8, and 10 reported ILI at or above region-specific baseline levels. Four states experienced high ILI activity; 5 state experienced moderate ILI activity; 10 states experienced low ILI activity; New York City and 31 states experienced minimal ILI activity, and the District of Columbia had insufficient data to calculate ILI activity.

    • Geographic Spread of Influenza: Twenty states reported widespread geographic activity; 20 states reported regional influenza activity; 2 states reported local activity; the District of Columbia, Guam, and 8 states reported sporadic activity, and Puerto Rico and the U.S. Virgin Islands did not report.

    External_F1211.pdf

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