China said a handful of packaging samples of imported shrimp tested positive for the coronavirus, raising questions again over whether the pathogen can spread through food or frozen products.

The virus tested positive on the outside of about five shrimp packages and the inside of one shipping container, said China’s General Administration of Customs. The samples were from three Ecuadorian plants, and imports from those processors will be halted, it said. A leading Ecuadorian shrimp exporter disputed the findings.

"The test result doesn’t mean the virus is contagious, but reflects the loopholes in companies’ food safety regulations,” said Bi Kexin, director of the food import and export safety bureau in the customs department. "Customs will further strengthen control of the origins of imported cold-chain food.”