Customs officers check imported food on a ship in Rongcheng, Shandong province, on Oct 7. (Photos: China Daily)

Officers from a local market supervision authority inspect seafood at a supermarket in Lianyungang, Jiangsu province, in July, 2020.

Retailers deliver vegetables to residents undergoing community quarantine after the novel coronavirus was detected at a seafood processing plant in Dalian, Liaoning province, in July, 2020.

Customs officers check a sample of novel coronavirus test reagent at Luogang Customs in South China's Guangdong province.