The causative agent of the transmissible spongiform encephalopathies (TSE) or prion diseases, which include sheep scrapie, mad cow disease, and human variant Creutzfeldt-Jakob disease (vCJD), is still hotly debated.—Suzette A. Priola et al., Science
While the methods of transmission of TSEs are not well understood … the effects of the diseases are the same whether the victim is sheep, deer, cow or human. The brain slowly erodes, with holes developing that give the organ a "spongy" appearance …—Shannon Thompkins, The Houston Chronicle
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