Now that the swine flu virus has passed from a farmworker to pigs, could it jump back to people? The question is important, because crossing species again could make it more deadly.

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Confirmed cases: At least 197 in the United States, including 24 in California; 473 in Mexico; 85 in Canada; 15 each in Spain and Britain; six in Germany; four in New Zealand; two each in Israel, France and South Korea; and one each in Costa Rica, Ireland, Italy, Switzerland, Austria, Hong Kong, Denmark and the Netherlands.


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