A barber wears surgical mask as a precaution to ward off contagion from the new multi-strain swine flu virus on April 27, 2009 in Mexico City. Every region in the world is at potential risk from the swine flu virus given the mobility of people by air travel, a senior World Health Organization official warned. Health experts on an emergency pandemic panel met earlier April 27 to recommend whether the WHO should raise the alert level as the likely death toll from the virus rose to 150 in Mexico.
Photo by Luis Acosta/AFP/Getty Images
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