Shanghai authorities have carried out nucleic acid testing for staff workers at the Shanghai Pudong International Airport after several confirmed COVID-19 cases were linked to airport personnel.

All personnel working at the airport's cargo terminals and cargo areas underwent nucleic acid tests from Sunday evening to Monday morning, according to Shanghai Airport Authority.

Quarantine workers set up a temporary testing area in an airport parking lot to carry out on-site swab sample collection and testing.

Besides, all of the places that the confirmed cases had visited have been disinfected.