Tests Confirm Second Mad Cow Case in U.S.

un 24, 3:45 PM (ET)

By LIBBY QUAID

WASHINGTON (AP) - Tests have confirmed mad cow disease in a U.S. cow previously cleared of having the brain wasting illness, the Agriculture Department said Friday. It is the second case of mad cow disease in the United States.

An internationally recognized laboratory in Weybridge, England, confirmed the case of mad cow disease after U.S. tests produced conflicting results, Agriculture Secretary Mike Johanns said.

Human health was not at risk, Johanns said. The animal was a "downer," meaning it was unable to walk. Such animals are banned from the food supply.