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FluView : 2011-2012 Influenza Season ; Week 52 ending December 31, 2011
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  • Description:
    All data are preliminary and may change as more reports are received. Synopsis: During week 52 (December 25-31, 2011), influenza activity increased in the United States, but remains relatively low. • U.S. Virologic Surveillance: Of the 3,310 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, 95 (2.9%) 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: No influenza-associated pediatric deaths were reported. • Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.7%, which is below the national baseline of 2.4%. Three of the 10 regions (Regions 1, 5, and 10) reported ILI at or above region-specific baseline levels. One state experienced moderate ILI activity, New York City and six states experienced low ILI activity, 42 states experienced minimal ILI activity, and the District of Columbia and one state had insufficient data. • Geographic Spread of Influenza: The geographic spread of influenza in one state was reported as regional; four states reported local activity; Guam and 40 states reported sporadic activity; the District of Columbia, the U.S. Virgin Islands and five states reported no influenza activity, and Puerto Rico did not report. External_F1152.pdf
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