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Map: International Co-circulation of 2009 H1N1 and Seasonal Influenza
(As of April 16, 2010; posted April 16, 2010, 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, Europe, Thailand and China are depicted. 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 the United States and Thailand have been 2009 H1N1 flu.