Surveillance Systems Work in Mad Cow Case

The first new case of mad cow disease in the U.S. since 2006 has been discovered in a dairy cow in California, but health authorities said Tuesday the animal never was a threat to the nation's food supply.

• 2012-04-25T19:04:49+00:00
• Duration: 01:22

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News & Politics , mad, cow, news, noticias, vidoe, raw, police, cop, amazing, case, vacas, cow