FluView : 2013-2014 Influenza Season ; Week 50 ending December 14, 2013
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FluView : 2013-2014 Influenza Season ; Week 50 ending December 14, 2013

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    Synopsis: During week 50 (December 8-14, 2013), influenza activity continued to increase in the United States.

    o Viral Surveillance: Of 7,294 specimens tested and reported by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories during week 50, 1,301 (17.8%) were positive for influenza.

    o Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.

    o Influenza-associated Pediatric Deaths: Two influenza-associated pediatric deaths were reported, one of which occurred during the 2012-13 season.

    o Influenza-associated Hospitalizations: A cumulative rate for the season of 3.0laboratory- confirmed influenza-associated hospitalizations per 100,000 population was reported.

    o Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 2.3%, above the national baseline of 2.0%. Five regions reported ILI at or above region-specific baseline levels. Four states experienced high ILI activity, one state experienced moderate ILI activity; six states and New York City experienced low ILI activity, 37 states experienced minimal ILI activity and the District of Columbia and two states had insufficient data.

    o Geographic Spread of Influenza: The geographic spread of influenza in 4 states was reported as widespread; 20 states reported regional influenza activity; 17 states reported local influenza activity; the District of Columbia, Guam, Puerto Rico, and 8 states reported sporadic influenza activity; one state reported no influenza activity, and the U.S. Virgin Islands did not report.

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