The City government said a sample of frozen chicken wings imported into the southern Chinese city of Shenzhen from Brazil has tested positive for coronavirus.

Shenzhen’s health authorities immediately traced and tested everyone who might have come into contact with potentially contaminated food products, and no one tested positive.

China reported on Wednesday that coronavirus had been found on the packaging of shrimps imported from Ecuador.

Since July, several other Chinese cities, including the port cities of Xiamen and Dalian, have also reported cases, prompting China to suspend imports from three Ecuadorean shrimp producers.

The novel coronavirus, which causes COVID-19, is believed to have emerged in a seafood and wildlife market in the central Chinese city of Wuhan late last year.