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Nurse Rebeca Rodriguez delivers masks to people at a health center in Mexico City April 24, 2009. A deadly strain of swine flu never seen before has broken out in Mexico, raising fears it is spreading across North America. The World Health Organization said it was concerned about what it called 800 "influenza-like" cases in Mexico, and also about a confirmed outbreak of a new strain of swine flu in the United States. [Agencies]
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