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

2009-2010 Influenza Season Week 19 ending May 15, 2010
All data are preliminary and may change as more reports are received.

Synopsis:
During week 19 ( May 9 - 15, 2010), influenza activity decreased in the U.S.

•14 (0.9%) 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 four subtyped influenza A viruses were 2009 influenza A (H1N1).
•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 0.8%, 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. One state reported local influenza activity. Puerto Rico and 19 states reported sporadic influenza activity. The District of Columbia, Guam, and 30 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