Workers disinfect class room against the swine flu at a National Autonomous University of Mexico, UNAM, in Mexico City, Monday, May 4, 2009. (Photo/Miguel Tovar) (image by MTF)
Workers disinfect class room against the swine flu at a National Autonomous University of Mexico, UNAM, in Mexico City, Monday, May 4, 2009. (Photo/Miguel Tovar)
©MTF
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