FluView : 2011-2012 Influenza Season ; Week 20 ending May 19, 2012
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    • Description:
      All data are preliminary and may change as more reports are received.

      Synopsis: During week 20 (May 13-19, 2012), influenza activity declined nationally and in most regions, but remained elevated in some areas of the United States.

      o U.S. Virologic Surveillance: Of the 2,054 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, 286 (13.9%) were positive for influenza.

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

      attributed to P&I was below the epidemic threshold.

      o Influenza-Associated Pediatric Mortality: Two influenza-associated pediatric deaths were reported. One was associated with a seasonal influenza A (H3) virus and one was associated with an influenza B virus.

      o Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.0%, which is below the national baseline of 2.4%. All regions reported ILI below region-specific baseline levels. One state experienced low ILI activity; New York City and 48 states experienced minimal ILI activity, and the District of Columbia and 1 state had insufficient data to calculate ILI activity.

      o Geographic Spread of Influenza: One state reported widespread geographic activity; 2 states reported regional influenza activity; 8 states reported local activity; the District of Columbia, Guam, Puerto Rico, and 30 states reported sporadic activity; the U.S. Virgin Islands and 8 states reported no influenza activity, and one state did not report.

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