A woman wears a mask as a precaution against swine flu as she walks at the National Autonomous University of Mexico, UNAM, in Mexico City, Monday, May 4, 2009. (Photo/Miguel Tovar) (image by MTF)
A woman wears a mask as a precaution against swine flu as she walks at the National Autonomous University of Mexico, UNAM, in Mexico City, Monday, May 4, 2009. (Photo/Miguel Tovar)
©MTF
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