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Nuns, wearing protective masks as a precaution against the swine flu outbreak, gesture in Mexico City's airport on May 1, 2009. (AP Photo/ Claudio Cruz)
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Two friends, dressed with phony protective suits, joke along a central avenue about the on going swine flu outbreak in Mexico City on May 1, 2009. (AP Photo/Eduardo Verdugo)
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A woman, wearing a face mask as a precaution against swine flu, holds a skeletal figure representing the folk saint known in Mexico as Santa Muerte, or Death Saint, during a ceremony in Mexico City on May 1, 2009. (AP Photo/Eduardo Verdugo)
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Medics work wearing protective gear as a sick child is carried by her mother in the emergency area where people with swine flu-like symptoms are checked at the naval hospital in Mexico City on May 1, 2009. (AP Photo/Brennan Linsley)
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A woman sits waiting to be seen by doctors, right, as a medic wearing protective gear admits a sick woman into the emergency area where people with swine flu-like symptoms are checked at the naval hospital in Mexico City on May 1, 2009. (AP Photo/Brennan Linsley)
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