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

2008-2009 Influenza Season Week 38 ending September 26, 2009
All data are preliminary and may change as more reports are received.

Synopsis:
During week 38 (September 20-26, 2009), influenza activity remained elevated in the U.S

2,126 (22.8%) 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.
99% of all subtyped influenza A viruses being 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.
Eleven influenza-associated pediatric deaths were reported and all eleven were associated with 2009 influenza A (H1N1) virus infection.
The proportion of outpatient visits for influenza-like illness (ILI) was above the national baseline. Regions 2 through 10 reported ILI above region-specific baseline levels; only Region 1 was below its region-specific baseline.
Twenty-seven states reported geographically widespread influenza activity, Guam and 18 states reported regional influenza activity, two states, the District of Columbia, and Puerto Rico reported local influenza activity, one state reported sporadic influenza activity, and the U.S. Virgin Islands and two states did not report.
The 2009-10 influenza season officially begins October 4, 2009.

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