Trucks that deliver food and pick up eggs have to disinfect their wheels before entering the farms, which must be located within a day's drive of the vaccine factory.

运送食物和收取鸡蛋的卡车进入养殖场前必须对车轮进行消毒，而且养殖场所处的位置必须在距离疫苗生产厂一天的车程之内。