Bovine spongiform encephalopathy (BSE) was first identified as a major problem in 1986 and traced to the practice of feeding cattle on animal protein supplements, allowing infected animal products to be ingested. In the mid 1990s it was established that mad cow disease, in the form of Creutzfeldt-Jacob Disease, could be transmitted to humans who ate meat from infected animals. In 1996 British beef was subject to bans from many countries. The EU lifted the ban in 1999.