Up to 30,000 Brits may be human carriers of mad cow disease. Here's what you need to know about bovine spongiform encephalopathy, or BSE.
Where did it come from? -- Mad cow disease was first recognized as an infectious disease in 1986, after it began to appear in cattle in Great Britain in 1985.
Keystone Resort/Ben Lindbloom
SRI International via Wikimedia Commons
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