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Cow infected with bovine spongiform encephalopathy (BSE): the emergence of BSE in cattle and new variant Creutzfeldt-Jackob disease in humans is linked to changes in feed processing and buchery practice (C. V. L. / Eurelios/ Science Photo Library)

Cow infected with bovine spongiform encephalopathy (BSE): the emergence of BSE in cattle and new variant Creutzfeldt-Jackob disease in humans is linked to changes in feed processing and buchery practice (C. V. L. / Eurelios/ Science Photo Library)

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