Still, residents have been asked to remain at home, flights to Beijing have been canceled and travelers from Qingdao to other parts of China must quarantine. Officials said the possibility of community transmission outside the hospital had been ruled out.
During their treatment, the two infected workers had CT scans.
China's National Health Commission (NHC) said on Friday that 240 people who came from overseas were being treated, and 376 asymptomatic cases, including 375 from outside the mainland, were under medical observation.
One of the workers had tested positive for the virus in late September, but only developed symptoms after 20 days, on October 14, the Qingdao Municipal Health Commission said in a statement.
What's more: The local government also said it will conclude a citywide virus testing on all of its more than 10 million residents by 6 p.m. Friday.
News of the latest infections came just days after China's weeklong National Day holiday.
The port city in eastern Shandong province has reported 13 recent infections, majority linked to the Qingdao Chest Hospital where infected travellers arriving from overseas had been treated in an isolation area.
On Thursday morning, only one independent positive case of the disease was reported: a 40-year-old port worker who was asymptomatic. The man works at a hotel used by the city for centralized quarantines and has been placed under medical observation at a local hospital.
One new suspected COVID-19 case from outside the mainland was reported in Shanghai, the commission said.