Is it safe? New beef rules aim to stop mad cow disease. But they may not be enough--and there's too much we don't know.
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D000818:Animals; D002417:Cattle; D016643:Encephalopathy, Bovine Spongiform / Q000453:epidemiology / Q000517:prevention & control*; D017408:Guidelines as Topic; D006801:Humans; D017751:Safety Management / Q000458:organization & administration; D006113:United Kingdom / Q000453:epidemiology; D014481:United States / Q000453:epidemiology