WHO Declares Swine Flu Outbreak 'Public Health Emergency'
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A woman and her child wear masks to prevent from being infected by the swine flu virus in the Mexico City, capital of Mexico, on April 25, 2009. [Xinhua]
A security man wears a mask to prevent from being infected by the swine flu virus in the Mexico City, capital of Mexico, on April 25, 2009. [Xinhua]