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

Caption: This map shows the WHO network sites that supplied the data the authors analyzed in their study. 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: Image courtesy of Science/AAAS

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