President Barack Obama delivers a speech during a reception and dinner at the Museo Nacional de Antropologia in Mexico City Thursday, April 16, 2009. A man Obama met at the anthropology museum later died with flu-like symptoms, raising concerns about the president's exposure to the swine flu epidemic in Mexico.
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Scientists have long been concerned that a new flu virus could launch a pandemic, a worldwide spread of a killer disease. A new virus could evolve when different flu viruses infect a pig, a person or a bird, mingling their genetic material. The resulting hybrid could spread quickly because people would have no natural defenses against it.
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