In Jinan, capital of eastern China’s Shandong province, the goods involved were imported by a unit of Guotai International Group , and Shanghai Zhongli Development Trade, the city’s municipal health commission said late on Saturday.

They entered through ports in Shanghai, it said, without naming the companies that shipped the products to China. More than 7,500 people who may have been exposed tested negative for coronavirus, it said.

The frozen pork cases were reported in Zhengzhou, capital of central China’s Henan province, and Xian, capital of Shaanxi. It was not immediately clear if the two cases were connected.

The samples that tested positive in Zhengzhou came from a 24-tonne batch of frozen pork sent from a storage facility in Qingdao, in Shandong, authorities said.