Declining to elaborate, officials they said they would need a week of tests on brain tissue samples from the suspicious cattle before they could officially confirm the case.
Mad cow disease, or bovine spongiform encephalopathy (BSE), attacks the animal's nervous system. People who eat the tainted meat can develop a human equivalent, called Creutzfeldt-Jakob disease, which is usually fatal.
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The first confirmed case in the US was found December 23 in a cow which was originally brought from Canada. Subsequently, nearly 30 countries banned imports of US beef.