This is the CDC’s influenza summary for the week ending August 29, 2009.

• Ninety-seven percent of sub-typed influenza A viruses reported to the CDC were of the H1N1 pandemic influenza type.
• Outpatient visits associated with influenza-like symptoms lower were below the national baseline.
• The proportion of deaths attributed to pneumonia and influenza was below epidemic threshold.

CDC

Synopsis:

During week 34 (August 23-29, 2009), influenza activity increased in the United States.
Since mid-April to August 30, 2009, a total of 9,079 hospitalizations and 593 deaths associated with 2009 influenza A (H1N1) viruses have been reported to CDC an increase from 8,843 hospitalizations and 556 deaths from the prior week. (Emphasis added)

• During week 34:
  • 1,109 (17.3%) 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.
  • 97% of all subtyped influenza A viruses being reported to CDC were 2009 influenza A (H1N1) viruses.
  • One human infection with a novel influenza A virus was reported.
  • 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 a 2009 influenza A (H1N1) virus infection.
  • The proportion of outpatient visits for influenza-like illness (ILI) was below the national baseline. Region IV reported ILI above its region-specific baseline.
  • Six states and Puerto Rico reported geographically widespread influenza activity, 13 states reported regional influenza activity, 10 states and the District of Columbia reported local influenza activity, 19 states reported sporadic influenza activity, two states reported no influenza activity, and Guam and the U.S. Virgin Islands did not report.* (Emphasis added)

Source: Centers for Disease Control and Prevention, Weekly Influenza Report, week 34 (August 23-29,2009)