Tianjin on Thursday suspended the operations of a local market after finding COVID-19 on its cold-chain products for two consecutive days.
According to health authorities, a sample collected from a cold storage facility in a wholesale frozen food market in Tianjin's Jinnan district tested positive for the virus.
Operations have been suspended at the market. Four people exposed to the products were quarantined and have so far tested negative for the virus.
A medical worker registers the personal information of a man who is taking a nucleic acid test
Experts from Tianjin and the National Health Commission have been dispatched to the market to investigate.
On Wednesday, the outer package of imported flatfish sold at a local shop was found to carry the novel coronavirus. The shop's flatfish was bought from the market in Jinnan, media reported.
Meanwhile, the COVID-19 strain taken from samples in Tianjin shows that the virus belongs to the L genotype of the European branch, sharing a high similarity to the confirmed cases in Beijing's Xinfadi market and Hebei Province from June to July.
So far, a total of 8,667 close contacts have been investigated in Tianjin, and 808 people are still under medical observation.