BSE may be responsible for two types of the fatal brain disease CJD, rather than one as was previously thought. This was the conclusion of researchers at University College London who carried out experiments on mice to investigate links between BSE and Creutzfeldt-Jakob Disease. Previously, eating BSE-infected beef was thought to cause variant CJD, now also known as human BSE. It is now thought, however, that BSE may also be responsible for sporadic CJD, a different strain of the incurable disease.