The specific source of infection was still under investigation, the city government said on Sunday.
The committee added that a citywide testing program has begun, with five districts being tested within three days and the entire city being tested within five days.
The Qingdao Chest Hospital has been positioned on lockdown and 114,862 folks - together with employees and sufferers - have examined unfavourable as of Monday, in keeping with the report. Buildings housing infected individuals have also been locked down as part of the city's virus containment measures.
In May, China tested the entire city of Wuhan, the epicenter of the global pandemic, with a population of 11 million. An investment and trade expo in Qingdao organised by the Shanghai Cooperation Organisation and scheduled for the weekend of October 16-18 was postponed, state TV reported.
And the city of Wuhan, which has a population of 11million and is where the virus first originated, was tested in 19 days back in June after a cluster of infections there. In this method, a test is conducted on a batch of five to 10 samples.
The number of new asymptomatic cases, which China does not classify as confirmed cases, rose to 39 from 15 a day earlier.
A spokesman for local authorities said the country now has a policy of mass-testing cities were a cluster of infections is reported, even if the cluster appears minor.
The latest outbreak, which includes six asymptomatic cases, is linked to a chest hospital in Qingdao responsible for treating passengers arriving from overseas who tested positive for COVID-19 upon entering China, the local health commission said Sunday. The death toll remains at 4,634.