2009 swine flu pandemic originated in Mexico, researchers discover

Researchers from the Fogarty International Center, Icahn School of Medicine at Mount Sinai, and Laboratorio Avi-Mex have used genetic sequencing to show that the 2009 global H1N1 influenza pandemic began in central Mexico, originating in pigs and spreading to humans. Mexico is not typically considered a source of novel influenza strains, and the findings demonstrate how long-distance trade of live swine can move viruses between continents and regions to generate novel reassortant viruses. The new findings appear online in the journal eLIFE.