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FluView : 2014-2015 Influenza Season ; Week 18 ending May 9, 2015

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    Synopsis: During week 18 (May 3-9, 2015), influenza activity continued to decrease in the United States. o Viral Surveillance: Of 7,533 specimens tested and reported by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories during week 18, 372 (4.9%) 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 :Twoinfluenza-associated pediatric deaths were reported. o Influenza-associated Hospitalizations:A cumulative rate for the season of 65.4 laboratory-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 1.2%, which is below the national baseline of 2.0%. All 10 regions reported ILI below region-specific baseline levels. Puerto Rico experienced moderate ILI activity; New York City and all 50 states experienced minimal ILI activity; and the District of Columbia had insufficient data. o Geographic Spread of Influenza: The geographic spread of influenza in three states was reported as widespread; Guam and two states reported regional activity; Puerto Rico and 12 states reported local activity; the District of Columbia and 27 states reported sporadic activity; and the U.S. Virgin Islands and six states reported no influenza activity.
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