That the food might be contaminated with African swine fever and spread the disease to the US. China has lost millions of pigs in outbreaks of the disease, pushing its pork prices to record highs, forcing purchases of costly imports and roiling global meat markets. Governments worldwide are scrambling to shore up their defenses as the disease spills over China’s borders. African swine fever has spread to Southeast Asia and eastern Europe, with cases found in Belgium, Bulgaria, Cambodia, North and South Korea, Laos, Myanmar, the Philippines, Poland and Vietnam. African swine fever does not threaten humans, but there is no vaccine or cure for infected pigs.