Mad cow's standing puts downer on testing strategy.
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D000818:Animals; D002417:Cattle; D016643:Encephalopathy, Bovine Spongiform / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology / Q000517:prevention & control*; D035082:Federal Government; D014481:United States / Q000453:epidemiology; D016885:United States Department of Agriculture / Q000592:standards*