A worker unloads boxes of imported frozen meat at a cold storage at Dalian port in Dalian, northeast China's Liaoning Province, April 8, 2020. Since it resumed operation, the port has streamlined its cold chain operation attempting to achieve greater efficiency. (Xinhua/Yao Jianfeng)

 
China has taken effective measures in preventing infections from infectious objects. During screening, COVID-19-positive rate remains 0.48 among 10,000 products; and it wasn't found on the outer packaging of imported food.