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Stopping Influenza at Its Source

Where does the flu come from? Scientists at the University of Cambridge and the World Health Organization's Global Influenza Surveillance Network tracked the migrations of flu viruses and discovered that the most common originate in East and Southeast Asia and spread in a distinctive pattern around the world. Understanding how these viruses evolve and travel will lead to better vaccines against flu epidemics that currently infect 5 to 15 percent of the world's population each year.