2009-2010 Influenza Season Week 11 ending March 20, 2010

2009-2010 Influenza Season Week 11 ending March 20, 2010

Synopsis:
During week 11 (March 14-20, 2010), influenza activity remained at approximately the same levels as last week in the U.S.

* 139 (4.6%) 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.
** Approximately 99% of 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 below the epidemic threshold.
**** One influenza-associated pediatric death was reported and was associated with an influenza A virus for which the subtype was undetermined.
***** The proportion of outpatient visits for influenza-like illness (ILI) was 1.8%, which is below the national baseline of 2.3%. Three of 10 regions (Regions 4, 7, and 9) reported ILI at or above region-specific baseline levels.
****** No states reported widespread influenza activity. Three states reported regional influenza activity. Puerto Rico and eight states reported local influenza activity. The District of Columbia, Guam and 31 states reported sporadic influenza activity. Eight states reported no influenza activity, and the U.S. Virgin Islands did not report.

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