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

2009-2010 Influenza Season Week 13 ending April 3, 2010
All data are preliminary and may change as more reports are received.

Synopsis:
During week 13 (March 28-April 3, 2010), influenza activity decreased slightly in the U.S.

•105 (3.7%) 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.
•All subtyped influenza A viruses reported to CDC were 2009 influenza A (H1N1) viruses.
•The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.
•One pediatric death associated with laboratory confirmed influenza A was reported; the subtype was undetermined.
•The proportion of outpatient visits for influenza-like illness (ILI) was 1.1%, which is below the national baseline of 2.3%. All 10 regions reported ILI below region-specific baseline levels.
•No states reported widespread influenza activity. Three states reported regional influenza activity. Puerto Rico and three states reported local influenza activity. The District of Columbia, Guam and 33 states reported sporadic influenza activity. Eleven states reported no influenza activity, and the U.S. Virgin Islands did not report.

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