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Map: International Co-circulation of 2009 H1N1 and Seasonal Influenza
(As of December 12, 2009; posted December 18, 2009, 3:30 PM 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, Europe, Japan and 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, Europe, Japan and China have been 2009 H1N1 flu.