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Flu Viruses Take One-Way Ticket out of Asia (1 of 2)

Caption: Seasonal influenza A strains constantly evolve in overlapping epidemics and East and Southeast Asia, which periodically spread to the rest of the world along the pathways shown here. This image relates to article that appeared in the April 18, 2008 issue of the journal Science, published by AAAS. The study, by Dr. Colin A. Russell of the University of Cambridge and colleagues, was titled "The Global Circulation of Seasonal Influenza A (H3N2) Viruses."

Credit: Photo provided by NASA/University of Cambridge

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