FluView: 2011-2012 Influenza Season Week 4 ending January 28, 2012
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FluView: 2011-2012 Influenza Season Week 4 ending January 28, 2012

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

    Synopsis: During week 4 (January 22-28, 2012), influenza activity in the United States increased slightly, but remained relatively low.

    • U.S. Virologic Surveillance: Of the 3,656 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, 262 (7.2%) 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: No influenza-associated pediatric deaths were reported.

    • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.5%, which is below the national baseline of 2.4%. All 10 regions reported ILI below region-specific baseline levels. One state experienced low ILI activity, New York City and 49 states experienced minimal ILI activity and the District of Columbia had insufficient data.

    • Geographic Spread of Influenza: The geographic spread of influenza in six states was reported as regional; 13 states reported local activity; Guam, Puerto Rico, and 31 states reported sporadic activity; the U.S. Virgin Islands reported no influenza activity, and the District of Columbia did not report.


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