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2009 H1N1 Flu: Situation Update, October 9, 2009

Atlanta, GA–(ENEWSPF)–October 9, 2009.

Key Flu Indicators

Each week CDC analyzes information about influenza disease activity in the United States and publishes findings of key flu indicators in a report called FluView. During the week of September 27 – October 3, 2009, a review of the key indictors found that influenza activity increased in the United States. Below is a summary of the most recent key indicators:

  • Visits to doctors for influenza-like illness (ILI) continued to increase in the United States, and overall, are higher than levels expected for this time of the year.
  • Total influenza hospitalization rates for laboratory-confirmed influenza are higher than expected for this time of year for adults and children. And for children 5-17 and adults 18-49 years of age, hospitalization rates from April – October 2009 exceed average flu season rates (for October through April).
  • The proportion of deaths attributed to pneumonia and influenza (P&I) based on the 122 Cities Report has increased and now exceeds what is normally expected at this time of year. In addition, 19 flu-related pediatric deaths were reported this week; 16 of these deaths were confirmed 2009 H1N1 and 3 were unsubtyped influenza A and likely to be 2009 H1N1. A total of 76 laboratory confirmed 2009 H1N1 pediatric deaths have been reported to CDC since April.
  • Thirty-seven states are reporting widespread influenza activity at this time. They are: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Texas, Tennessee, Virginia, Washington, and Wyoming. Any reports of widespread influenza activity in September and October are very unusual.
  • Almost all of the influenza viruses identified so far are 2009 H1N1 influenza A viruses. These viruses remain similar to the virus chosen for the 2009 H1N1 vaccine, and remain susceptible to the antiviral drugs oseltamivir and zanamivir with rare exception.
  • U.S. Influenza and Pneumonia-Associated Hospitalizations
    and Deaths from August 30 – October 3, 2009
    Posted October 9, 2009, 11:00 AM ET
    Data reported to CDC by October 6, 2009, 12:00 AM ET
    Cases Defined by
    Hospitalizations
    Deaths
    Influenza and Pneumonia Syndrome* 12,384 1,544
    Influenza Laboratory-Tests** 3,874 240

    *Reports can be based on syndromic, admission or discharge data, or a combination of data elements that could include laboratory-confirmed and influenza-like illness hospitalizations.

    **Laboratory confirmation includes any positive influenza test (rapid influenza tests, RT-PCR, DFA, IFA, or culture), whether or not typing was done.

    This table is based on data reported to CDC by U.S. states and territories from a new influenza and pneumonia hospitalizations and deaths web-based reporting system. This system will be used to monitor trends in activity for the 2009-1o influenza season. This is a cumulative count beginning August 30, 2009. The table shows aggregate reports of all influenza and pneumonia-associated hospitalizations and deaths (including 2009 H1N1 and seasonal flu) since August 30, 2009 received by CDC from U.S. states and territories. This table will be updated weekly each Friday at 11 a.m. For the 2009-2010 influenza season, states are reporting based on new case definitions for hospitalizations and deaths effective August 30, 2009.

    CDC will continue to use its traditional surveillance systems to track the progress of the 2009-2010 influenza season. For more information about influenza surveillance, including reporting of influenza-associated hospitalizations and deaths, see Questions and Answers: Monitoring Influenza Activity, Including 2009 H1N1.

    The number of 2009 H1N1 hospitalizations and deaths reported to CDC from April – August 2009 is available on the Past Situation Updates page.

    For state level information, refer to state health departments.

     

    Source: cdc.gov

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