CDC Confirms Ties to Virus First Discovered in U.S. Pig Factories

Factory farming and long-distance live animal transport apparently led to the emergence of the ancestors of the current swine flu threat.

A preliminary analysis of the H1N1 swine flu virus isolated from human cases in California and Texas reveals that six of the eight viral gene segments arose from North American swine flu strains circulating since 1998, when a new strain was first identified on a factory farm in North Carolina.

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