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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.

Map: International Co-circulation of 2009 H1N1 and Seasonal Influenza
(As of August 6, 2010; posted August 9, 2010, 4:00 PM ET)

This picture depicts a map of the world that shows the co-circulation of 2009 H1N1 flu and seasonal influenza viruses. Australia, Chile, China, Ghana, Kenya, New Zealand, and Thailand are represented. There is a pie chart for each that shows the proportion of laboratory-confirmed influenza cases that have tested positive for either 2009 H1N1 flu or other influenza subtypes. The majority of laboratory-confirmed influenza cases reported in Australia, Chile, and Ghana in weeks 28 and 29 were 2009 H1N1 flu. The U.S. Government's Official Web PortalDepartment of Health and Human Services
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