Influenza Season Week 22 ending June 6, 2009

15 06 2009

CDC – Novel H1N1 Flu Situation Update

Summary of Situation
Updated June 11, 2009, 12:30 PM ET
A Pandemic Is Declared
On June 11, 2009, the World Health Organization (WHO) raised the worldwide pandemic alert level to Phase 6 in response to the ongoing global spread of the novel influenza A (H1N1) virus. A Phase 6 designation indicates that a global pandemic is underway.

June 12, 2009, 12:30 PM ET
States reporting 52
17,855 confirmed cases
45 deaths

WHO – Influenza A(H1N1) – update 48
12 June 2009 — As of 07:00 GMT, 12 June 2009, 74 countries have officially reported 29,669 cases of influenza A(H1N1) infection, including 145 deaths.

Influenza Season Week 22

Influenza Season Week 22


During week 22 (May 31 – June 6, 2009), influenza activity decreased in the United States, however, there are still higher levels of influenza-like illness than is normal for this time of year.

  • Two thousand six hundred eighty-one (40.2%) 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.
  • Approximately 89% of all influenza viruses being reported to CDC were novel influenza A (H1N1) viruses.
  • The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.
  • Three influenza-associated pediatric deaths were reported; two were associated with novel influenza A (H1N1) virus infection and one was associated with seasonal influenza A (H1N1) virus infection.
  • The proportion of outpatient visits for influenza-like illness (ILI) was below the national baseline. Two of the 10 surveillance regions reported ILI above their region-specific baseline.
  • Eight states reported geographically widespread influenza activity, nine states reported regional influenza activity, the District of Columbia, Puerto Rico, and 15 states reported local influenza activity, 17 states reported sporadic influenza activity, and one state did not report.



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