2009-2010 Influenza Season Week 2 ending January 16, 2010
Synopsis:During week 2 (January 10-16, 2010), influenza activity decreased slightly in the U.S.
- 120 (3.7%) 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.
- Ninety-eight percent of 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. Three deaths were associated with 2009 influenza A (H1N1) virus infection, four were associated with an influenza A virus for which the subtype was undetermined, one was associated with an influenza A (H3) virus infection, and one was associated with an influenza B virus infection. The influenza A(H3) and B deaths occurred during the 2008-09 influenza season.
- The proportion of outpatient visits for influenza-like illness (ILI) was 1.8% which is below the national baseline of 2.3%. One of the 10 regions (region 9) reported ILI above their region-specific baseline.
- No states reported widespread influenza activity, seven states reported regional influenza activity, Puerto Rico, and 10 states reported local influenza activity, the District of Columbia, Guam, and 32 states reported sporadic influenza activity, and the U.S. Virgin Islands and one state reported no influenza activity.