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

Synopsis: During week 10 (March 3 – 9, 2013), influenza activity remained elevated in the United States, but decreased in most areas.

o Viral Surveillance: Of 5,747 specimens tested and reported by collaborating laboratories, 821 (14.3%) were positive for influenza.

o Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and

influenza (P&I) was above the epidemic threshold.

o Influenza-Associated Pediatric Deaths: Twelve pediatric deaths were reported.

o Influenza-Associated Hospitalizations: A cumulative rate for the season of 39.6

laboratory-confirmed influenza-associated hospitalizations per 100,000 population was

reported. Of reported hospitalizations, 51% were among adults 65 years and older.

o Outpatient Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) was 2.6%. This is above the national baseline of 2.2%. Six of 10 regions reported ILI at or above region-specific baseline levels. Five states and New York City experienced moderate activity; 12 states experienced low activity; and 33 states and the District of Columbia experienced minimal activity.

o Geographic Spread of Influenza: Eight states reported widespread influenza activity;

Puerto Rico and 19 states reported regional influenza activity; the District of Columbia and 17 states reported local influenza activity; 6 states reported sporadic influenza activity; Guam reported no influenza activity, and the U.S. Virgin Islands did not report.

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