where did the mad cow disease come from
Bovine spongiform encephalopathy BSE is due to an infection by a misfolded protein, known as a prion.[3] Cattle are believed to have been infected by being feed meat-and-bone meal (MBM) that contained the remains of other cattle who spontaneously developed the disease or scrapie-infected sheep products.[3] The outbreak increased throughout the United Kingdom due to the practice of feeding meat-and-bone meal to young calves of dairy cows.[3][6] Cases are suspected based on symptoms and confirmed by examination of the brain.[1] Cases are classified as classic or atypical, with the latter divided into H- and L types.[1]