South Korea began resuming imports of boneless U.S. beef last April, then re-imposed the complete ban after bones were found in several shipments.

• 2003年，美国的一只牛被查出感染了致命的神经系统疾病疯牛病，随后韩国禁止从美国进口牛肉。人吃了感染疯牛病的牛肉有可能染上这种致命的疾病。