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WHO Declares Swine Flu Outbreak 'Public Health Emergency'

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People on a bus wear masks to prevent from being infected by the swine flu virus in the Mexico City, capital of Mexico, on April 25, 2009.

People on a bus wear masks to prevent from being infected by the swine flu virus in the Mexico City, capital of Mexico, on April 25, 2009. [Xinhua]
Local people wear masks to prevent from being infected by the swine flu virus in the Mexico City, capital of Mexico, on April 25, 2009.

Local people 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 woman wears a mask to prevent from being infected by the swine flu virus in the Mexico City, capital of Mexico, on April 25, 2009. The World Health Organization (WHO) on Saturday declared the swine flu outbreak in Mexico and the United States a 'public health emergency of international concern' and urged countries to be alert.
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