TORONTO - A new study says flu viruses of swine origin that caused a dozen infections in the United States in the second half of last year appear to have pandemic potential.
And the work, by scientists at the U.S. Centers for Disease Control, seems to suggest that the fact the viruses haven't taken off in people may have more to do with human immunity than the viruses themselves.
Seeded on Tue Feb 21, 2012 6:31 AM EST

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