People wearing surgical masks walk near to the Zocalo main square   in Mexico City, Friday, April 24, 2009. Federal health authorities closed schools Friday across this metropolis of 20 million after at least 16 people have died and more than 900 others fell ill from what health officials suspect is a strain of swine flu new to Mexico. (Photo/Miguel Tovar) (image by MTF)
People wearing surgical masks walk near to the Zocalo main square in Mexico City, Friday, April 24, 2009. Federal health authorities closed schools Friday across this metropolis of 20 million after at least 16 people have died and more than 900 others fell ill from what health officials suspect is a strain of swine flu new to Mexico. (Photo/Miguel Tovar)
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