FluView : 2015-2016 Influenza Season ; Week 48 ending December 5, 2015
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FluView : 2015-2016 Influenza Season ; Week 48 ending December 5, 2015

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

    Synopsis: During week 48 (November 29 – December 5, 2015), influenza activity increased slightly in the United States but remained low overall.

    o Viral Surveillance: The most frequently identified influenza virus type reported by public health laboratories during week 48 was influenza A viruses, with influenza A (H3) viruses predominating. The percentage of respiratory specimens testing positive for influenza in clinical laboratories was low.

    o Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below their system-specific epidemic threshold in both the NCHS Mortality Surveillance System and the 122 Cities Mortality Reporting System.

    o Influenza-associated Pediatric Deaths: Two influenza-associated pediatric deaths were reported, including one influenza-associated pediatric death that occurred during the 2014-2015 season.

    o Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.8%, which is below the national baseline of 2.1%. Four of 10 regions reported ILI at or above region-specific baseline levels. One state experienced high ILI activity; Puerto Rico and four states experienced low ILI activity; New York City and 45 states experienced minimal ILI activity; and the District of Columbia had insufficient data.

    o Geographic Spread of Influenza: The geographic spread of influenza in Guam was

    reported as widespread; Puerto Rico reported regional activity; 10 states reported local activity; the U.S. Virgin Islands and 37 states reported sporadic activity; and the District of Columbia and three states reported no influenza activity.


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