Bovine spongiform encephalopathy (BSE), also known as mad cow disease, and variant Creutzfeldt-Jakob disease (CJD) are related disorders. They belong to the family of diseases known as the transmissible spongiform encephalopathies (TSEs).
Mad-cow disease is suspected of causing the fatal human ailment, Creutzfeldt-Jakob Disease. Polish authorities have conducted approximately 100,000 BSE tests since the disease was discovered in many western European countries. Poland also banned imports from countries where the disease had been discovered.