A South Korean employee displays local beef at a Lotte Mart as the store suspended sales of all US beef in Seoul on April 25, 2012. Two major South Korean retailers suspended sales of US beef after a new case of mad cow disease in California, and the government said it would tighten inspection of imports. AFP PHOTO / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
A South Korean employee displays local beef at a Lotte Mart as the store suspended sales of all US beef in Seoul on April 25, 2012. Two major South Korean retailers suspended sales of US beef after a new case of mad cow disease in California, and the government said it would tighten inspection of imports. AFP PHOTO / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)

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'Mad cow' case confirmed by USDA

Elizabeth Cohen reports on the confirmed case of "mad cow" disease in California.

'Mad cow' case confirmed by USDA

Elizabeth Cohen reports on the confirmed case of "mad cow" disease in California.