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Passengers wearing face masks at airport in Beijing

Passengers wearing face masks as a precaution against swine flu arrive at the Beijing International Airport May 7, 2009. China's measures have drawn complaints from Mexico and other countries that their citizens were being quarantined based merely on their nationality, but China defends the measures, saying they are needed to block the swine flu virus from entering the world's most populous nation. (UPI Photo/Stephen Shaver)

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