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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 September 20, 2009; posted September 25, 2009, 11:00 AM ET)

This picture depicts a map of the world that shows the co-circulation of 2009 H1N1 flu and seasonal influenza viruses. The United States, Canada, Ecuador, Europe, Australia, Kenya, Vietnam, China and Hong Kong (China) are depicted. There is a pie chart for each that shows the percentage 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 the United States, Canada, Ecuador, Europe, Australia, Vietnam and Hong Kong (China) are currently due to 2009 H1N1 influenza virus. However, the majority of laboratory confirmed influenza cases reported in China and Kenya are positive for other influenza subtypes.

 
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