The government first banned shipments in December of two thousand three.That was when the United States reported its first case of mad cow disease -- bovine spongiform encephalopathy, or B.S.E.

• 日本政府在2003年12月第一次颁布进口牛肉禁令，即是美国报道第一例疯牛病-牛海绵体脑病的时候。