Webmd https://www.webmd.com/brain/mad-cow-disease-basics Mad Cow WebMD webmd.com http://www.webmd.com mad cow disease mad cow disease https://www.webmd.com/brain/mad-cow-disease-basics Creutzfeldt-Jakob disease (vCJD) mad-cow epidemic webmd.com mad cow mad cow disease The Basics of Mad Cow Disease - WebMD WebMd brains and spines of infected cattle or sheep