4/24/2012 1:20 PM

On April 24, the USDA announced the nation's fourth case of bovine spongiform encephalopathy (BSE), sometimes called mad cow disease, in a dairy cow from central California. Dr. John Clifford, USDA's chief veterinary officer, answers a series of questions about this BSE case.

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7/31/2014 | Last Updated: 6:16 AM