Canada confirmed a case of mad cow disease on Sunday at a farm in British Columbia — the country's fifth case since May 2003, when the United States closed its border to Canadian beef.

The Canadian Food Inspection Agency announced Thursday it had a suspected case of bovine spongiform encephalopathy, or
BSE.

In humans, meat products contaminated with BSE has been linked to more than 150 deaths, mostly in Britain, from variant Creutzfeldt-Jakob Disease, a rare and fatal nerve disease.

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