WASHINGTON
Put swine flu in a room with other strains of influenza and it doesn't mix into a new superbug _ it takes over, researchers reported Tuesday.
University of Maryland researchers deliberately co-infected ferrets to examine one of the worst fears about the new swine flu. But fortunately, the flu didn't mutate. The researchers carefully swabbed the ferrets' nasal cavities and found no evidence of gene-swapping.
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