CDC - Seasonal Influenza (Flu) - Weekly Report: Influenza Summary Update

2009-2010 Influenza Season Week 16 ending April 24, 2010
All data are preliminary and may change as more reports are received.

Synopsis:
During week 16 (April 18-24, 2010), influenza activity decreased in the U.S.

•16 (1.2%) specimens tested by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories and reported to CDC/Influenza Division were positive for influenza.
•Among eight subtyped influenza A viruses, seven were 2009 influenza A (H1N1) and one was influenza A (H3).
•The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.
•No influenza-associated pediatric deaths were reported.
•The proportion of outpatient visits for influenza-like illness (ILI) was 1.0%, which is below the national baseline of 2.3%. All 10 regions reported ILI below region-specific baseline levels.
•No states reported widespread or regional influenza activity. Two states reported local influenza activity. The District of Columbia, Guam, Puerto Rico, and 30 states reported sporadic influenza activity. Seventeen states reported no influenza activity, and the U.S. Virgin Islands and one state did not report.

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CDC - Seasonal Influenza (Flu) - Weekly Report: Influenza Summary Update