Passengers wear protective masks riding a bus in Mexico City, Wednesday April 29, 2009. The World Health Organization has declared a Phase 5 outbreak of swine flu, the second-highest on its threat scale, indicating a pandemic could be imminent.(Photo/Miguel Tovar) (image by MTF)
Passengers wear protective masks riding a bus in Mexico City, Wednesday April 29, 2009. The World Health Organization has declared a Phase 5 outbreak of swine flu, the second-highest on its threat scale, indicating a pandemic could be imminent.(Photo/Miguel Tovar)
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