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

2009-2010 Influenza Season Week 45 ending November 14, 2009
All data are preliminary and may change as more reports are received.

Please note that because of the upcoming Thanksgiving holiday, the week 46 report will be distributed on Monday, November 30, 2009.

Synopsis:
During week 45 (November 8-14, 2009), influenza activity decreased slightly in the U.S.
3,106 (28.8%) 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.
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 seventh consecutive week.
Twenty-one influenza-associated pediatric deaths were reported. Fifteen of these deaths were associated with 2009 influenza A (H1N1) virus infection, and six were associated with an influenza A virus for which the subtype was undetermined.
The proportion of outpatient visits for influenza-like illness (ILI) was 5.5% which is above the national baseline of 2.3%. All 10 regions reported ILI above region-specific baseline levels.
Forty-three states reported geographically widespread influenza activity, Puerto Rico and seven states reported regional influenza activity, the District of Columbia 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