Virus may be cause of mad cow, study finds (The Wichita Eagle) Mad cow disease and other related brain disorders might be caused by a virus and not the misshapen proteins, known as prions, that scientists think are responsible, according to a study published Tuesday. [News Source]

Virus May Cause Prion Diseases (RedNova) U.S. researchers say a virus could be the cause of prion diseases, including mad cow and Creutzfeldt-Jakob diseases. [News Source]