Japan's health ministry has said that an eighth case of mad cow disease has been discovered in the country and there are concerns that it may be a new strain of the disease. A 23-month old bullock was found to be infected with bovine spongiform encephalopathy (BSE), or mad cow disease, bringing the number of confirmed cases of the disease in the country to eight. The animal was born in October 2001, the same month Japan banned meat-and-bone meal, which was considered to be the main cause of infection, reported Agence France-Presse.