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Content on this page was developed during the 2009-2010 H1N1 pandemic and has not been updated.

  • The H1N1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide.
  • The English language content on this website is being archived for historic and reference purposes only.
  • For current, updated information on seasonal flu, including information about H1N1, see the CDC Seasonal Flu website.

2009 H1N1 Flu Situation Update
September 4, 2009, 11:00 AM ET

Map: Weekly Influenza Activity Estimates Reported by State and Territorial Epidemiologists
(Activity levels indicate geographic spread of both seasonal and 2009 influenza A [H1N1] viruses)
(Posted September 4, 2009, 2:00 PM ET, for Week Ending August 29, 2009)

FluView, Week Ending August 29, 2009. Weekly Influenza Surveillance Report Prepared by the Influenza Division. Weekly Influenza Activity Estimate Reported by State and Territorial Epidemiologists. Select this link for more detailed data.

For more details about the data in the map above, see the FluView Surveillance Report for the week ending August 29, 2009. For information about how this map is updated, see Questions & Answers About CDC's Online Reporting.

Percentage of Visits for Influenza-like Illness (ILI) Reported by the U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet), National Summary 2008-2009 and Previous Two Seasons
(Posted August 28, 2009, 6:00 PM ET, for Week Ending August 22, 2009)

Graph of U.S. patient visits reported for Influenza-like Illness (ILI) for week ending August 22, 2009.


Total U.S. 2009 H1N1 Flu Hospitalizations and Deaths, April - August 2009
Posted September 4, 2009, 11:00 AM ET
Data reported to CDC by September 3, 2009, 9:00 AM ET
Reporting States and Territories*
Hospitalized Cases
53 9,079 593

*Includes the District of Columbia, American Samoa, Guam, Puerto Rico and the U.S. Virgin Islands.

The number of hospitalized 2009 H1N1 cases and deaths presented in this table are an aggregate
of reports received by CDC from U.S. states and territories and will be updated weekly each
Friday at 11am. For state level information, refer to state health departments.

CDC discontinued reporting of individual confirmed and probable cases of 2009 H1N1 infection on
July 24, 2009. CDC will report the total number of hospitalizations and deaths weekly, and continue
to use its traditional surveillance systems to track the progress of the 2009 H1N1 flu outbreak.
For more information about CDC’s 2009 H1N1 influenza surveillance system, see
Questions & Answers About CDC's 2009 H1N1 Influenza Surveillance.

International Human Cases of 2009 H1N1 Flu Infection
See: World Health Organization. The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Road Atlanta, GA 30329-4027, USA
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