The results of samples collected from people and environments related to the coronavirus-tainted imported frozen food all showed negative for the virus, Yantai in Shandong province said on Sunday.

A medical worker in protective suit collects a throat swab from a woman at a nucleic acid testing site in Qingdao, Shandong province, on Oct 13, 2020. [Photo/China Daily]

The city's office that oversees the work of epidemic prevention and economic development said the city has ruled out the possibility of the coronavirus spread.

Yantai was officially informed by other cities in the province on Thursday that samples from the outer packaging of imported frozen pork purchased from an enterprise based in Yantai tested positive for novel coronavirus.

The city traced and tested all the places related to the batch of the imported virus contaminated pork including markets and restaurants and from all related places, as well as people who were potentially exposed to the virus in transportation, loading and unloading, unwrapping and processing on Thursday and Friday. A day later the tracing and testing extended to places and people related to all the products of company.

By the midnight of Saturday, Yantai had tested 8,409 samples, of which 1,344 were from people and the other from related products, packages and environment, and all the results showed negative. The city has completed all work on tracing and testing work related to the coronavirus infected food case and ruled out the risk of virus spread.