A group of nuns walk wearing surgical masks in the Zocalo plaza in Mexico City, Saturday, April 25, 2009. Mexico City canceled hundreds of public concerts, sporting events and meetings on Saturday as authorities in this overcrowded capital tried to contain an outbreak of a deadly new form of swine flu that world health officials warn could become a pandemic. (AP Photo/Gregory Bull)
Read the article: WHO declares 'international concern' over swine flu outbreaks in United States and Mexico
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