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

2009-2010 Influenza Season Week 4 ending January 30, 2010

Synopsis:
During week 4 (January 24-30, 2010), influenza activity remained at approximately the same levels as last week in the U.S.

*119 (3.2%) 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 above the epidemic threshold.
*Nine influenza-associated pediatric deaths were reported. Eight deaths were associated with 2009 influenza A (H1N1) virus infection and one was associated with an influenza A virus for which the subtype was undetermined.
*The proportion of outpatient visits for influenza-like illness (ILI) was 1.9% which is below the national baseline of 2.3%. All regions reported ILI below their region-specific baseline.
*No states reported widespread influenza activity, six states reported regional influenza activity, Puerto Rico and 10 states reported local influenza activity, the District of Columbia, Guam, and 31 states reported sporadic influenza activity, and the U.S. Virgin Islands and three states reported no influenza activity.

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