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H1N1 (Swine Flu): New FluView Shows Continual Improvement Across the U.S

November 30, 2009

Although people are still getting sick and deaths are continuing, the pandemic picture is continuing to improve as the second wave continues its downward trend.  The CDC FluView report is delayed this week due to the Thanksgiving holiday.

  • Over 99% of all subtyped influenza A viruses being reported to CDC were 2009 H1N1.
  • The proportion of deaths attributed to pneumonia and influenza (P&I) was above the epidemic threshold for the eighth consecutive week.
  • Thirty-five influenza-associated pediatric deaths were reported.
    • Twenty-seven of these deaths were associated with 2009 influenza A (H1N1) virus infection, seven were associated with an influenza A virus for which the subtype was undetermined, and one was associated with a seasonal influenza A (H1) virus infection that occurred in March.
  • The proportion of outpatient visits for influenza-like illness (ILI) was 4.3% which is above the national baseline of 2.3%. All 10 regions reported ILI above region-specific baseline levels.
  • Thirty-two states reported geographically widespread influenza activity.

Hospitalizations and Deaths

From August 30 – November 21, 2009, 29,348 laboratory-confirmed influenza-associated hospitalizations and 1,224 laboratory-confirmed influenza-associated deaths were reported to CDC.

Pediatric Deaths

Thirty-five influenza-associated pediatric deaths were reported to CDC during week 46:

  • California, Colorado, Florida [3], Illinois [3], Indiana, Kentucky, Massachusetts, Minnesota, Missouri, New Hampshire, New Mexico [8], New York, North Carolina [2], Pennsylvania [2], Rhode Island [2], South Carolina [2], Tennessee, Texas [2], and Washington).
  • Twenty-seven of these deaths were associated with 2009 influenza A (H1N1) virus infection, seven were associated with an influenza A virus for which the subtype is undetermined, and one was associated with a seasonal influenza A (H1) virus infection.

Outpatient Surveillance

Nationwide during week 46, 4.3% of patient visits reported through the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet) were due to influenza-like illness (ILI). This percentage is above the national baseline of 2.3%.

Geographical Spread

A significant shift in the color distribution this week...a lot more orange!

During week 46, the following influenza activity was reported:

  • Widespread influenza activity was reported by 32 states (Alabama, Alaska, Arizona, California, Connecticut, Delaware, Florida, Idaho, Illinois, Indiana, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, Tennessee, Utah, Vermont, Virginia, and West Virginia).
  • Regional influenza activity was reported by Puerto Rico and 17 states (Arkansas, Colorado, Georgia, Hawaii, Iowa, Louisiana, Minnesota, Mississippi, Missouri, Montana, Nebraska, North Dakota, South Carolina, South Dakota, Texas, Washington, and Wisconsin).
  • Local influenza activity was reported by the District of Columbia and one state (Wyoming).
  • Sporadic influenza activity was reported by Guam and the U.S. Virgin Islands.

http://www.cdc.gov/flu/weekly/

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