A cow in the Canadian province of Alberta was diagnosed last month with
bovine spongiform encephalopathy (BSE), or mad cow disease, arousing concerns
about the potential spread of the disease in North America. The only previous
case of BSE in Canada occurred in 1993 in a bull imported from the United
Kingdom; the disease has never been detected in US cattle.
The infected animal may have been born in Saskatchewan, according to
the Canadian Food Inspection Agency. If this proves to be the case, it would
be the first occurrence of a North American–born animal contracting
Stephenson J. BSE Surfaces in Canada. JAMA. 2003;289(22):2929. doi:10.1001/jama.289.22.2929-a
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