National Center for Immunization and Respiratory Diseases (U.S.). Influenza Division.

Synopsis: During week 42 (Oc to ber 13-19, 2013), influenza activity remained low in the United States. o Viral Surveillance: Of 3,513 specimens tested and reported by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories during week 42, 135 (3.8%) 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 :Twoinfluenza-associated pediatric deaths that occurred during the 2012-2013 season were reported. o Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 1.2%, below the national baseline of 2.0%. All 10 regions reported ILI below region-specific baseline levels. Two states experienced low ILI activity, 48 states and New York City experienced minimal ILI activity and the District of Columbia had insufficient data. o Geographic Spread of Influenza: The geographic spread of influenza in Puerto Rico was reported as regional; 3 states reported local influenza activity; Guam, the District of Columbia, and 28 states reported sporadic influenza activity, and the U.S. Virgin Islands and 19 states reported no influenza activity.

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