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.
What are the symptoms? Creutzfeldt-Jakob disease -- the human variant of mad cow disease -- is marked by rapid mental deterioration, usually within a few months, according to Mayo Clinic. Symptoms include anxiety, depression, personality changes, memory loss, impaired thinking, blurred vision, insomnia, difficulty speaking and swallowing, and sudden jerky movements.
Danny Moloshok / Reuters
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