Backgrounder: Key facts about swine flu
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A Mexican soldier carries a pack of
masks which will be distributed to pedestrians in Mexico City, capital of
Mexico, April 25, 2009. Mexican government has handed out 6 million masks
for free to citizens of Mexico City since April 23. 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.(Xinhua/David de la paz)
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