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

2009-2010 Influenza Season Week 46 ending November 21, 2009
All data are preliminary and may change as more reports are received.

Synopsis:
During week 46 (November 15-21, 2009), influenza activity continued to decrease in the U.S.

1,880 (20.5%) 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.
Over 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 above the epidemic threshold for the eighth consecutive week.
Thirty-five influenza-associated pediatric deaths were reported. Twenty-seven of these deaths were associated with 2009 influenza A (H1N1) virus infection, seven were associated with an influenza A virus for which the subtype was undetermined, and one was associated with a seasonal influenza A (H1) virus infection that occurred in March.
The proportion of outpatient visits for influenza-like illness (ILI) was 4.3% which is above the national baseline of 2.3%. All 10 regions reported ILI above region-specific baseline levels.
Thirty-two states reported geographically widespread influenza activity, Puerto Rico and 17 states reported regional influenza activity, the District of Columbia and one state reported local influenza activity, and Guam and the U.S. Virgin Islands reported sporadic influenza activity.

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

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