Mass Covid-19 testing of Shanghai airport workers as city reports new cases More than 17,700 employees at Pudong International screened; high-risk staff to be given experimental vaccines. Panic grips Shanghai airport after employees are sealed in for coronavirus testingMore than 17,000 cargo workers were tested for the virus on Sunday after a cluster of seven cases. Shanghai airport momentarily descends into chaos after workers test positive for Covid-19Shanghai's biggest international airport momentarily descended into chaos Sunday night, after authorities ordered a mass testing drive in response to a small outbreak of Covid-19 linked to several cargo handlers. Shanghai Covid outbreak 'traced to cargo from North America'Airport staff tested and flights cancelled as officials say two cargo handlers were first cases