Synopsis: During week 10 (March 2-8, 2014), influenza activity continued to decrease in the United States.

o ViralSurveillance:Of6,372specimenstestedandreportedduringweek10byU.S.World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories, 535 (8.4%) were positive for influenza.

o PneumoniaandInfluenzaMortality:Theproportionofdeathsattributedtopneumoniaand influenza (P&I) was below the epidemic threshold.

o Influenza-associatedPediatricDeaths:Threeinfluenza-associatedpediatricdeathswere reported.

o Influenza-associatedHospitalizations:Aseason-cumulativerateof29.2laboratory- confirmed influenza-associated hospitalizations per 100,000 population was reported.

o OutpatientIllnessSurveillance:Theproportionofoutpatientvisitsforinfluenza-likeillness (ILI) was 2.0%, which is at the national baseline. Four of 10 regions reported ILI at or above region-specific baseline levels. Two states experienced high ILI activity; six states and New York City experienced low ILI activity; 42 states experienced minimal ILI activity, and the District of Columbia had insufficient data.

o GeographicSpreadofInfluenza:Thegeographicspreadofinfluenzainfourstateswas reported as widespread; 12 states reported regional influenza activity; the District of Columbia, Guam, and 20 states reported local influenza activity; Puerto Rico and 13 states reported sporadic influenza activity; the U.S. Virgin Islands reported no influenza activity, and one state did not report.

Stephen B. Thacker CDC Library collection

United States