Other Chinese cities are gearing up to screen people who are believed to have had the potential for exposure from the Qingdao outbreak.

In Beijing, kindergartens and primary and high schools started screening students' recent travel routes by asking parents to report whether they have been to Qingdao since Sept 27 or whether they are living with anyone from Qingdao.

Pang Xinghuo, deputy head of the Beijing Center for Disease Control and Prevention, suggested locals not travel to Qingdao if not absolutely necessary.

"Residents of Beijing who have been to Qingdao over the past 14 days should monitor their health condition closely," she said at a news conference Monday. "The ones who have been to Qingdao since Sept 27 and have taken the taxi with the license plate number UT4923 should get in contact with their community or go to a medical institution for nucleic acid testing."

The driver of that Qingdao taxi was confirmed as testing positive for COVID-19, health authorities said.

The city's health commission has designated the No 3 People's Hospital as a backup hospital to treat newly detected COVID-19 patients.

As of Monday, the city had tested all known contacts of patients with confirmed cases－those 840 people have all have tested negative.

In addition, the city tested 162,601 medical workers, patients and attendants in hospitals citywide. Of those, 154,815 had been found negative, according to results available so far.

A total of 114,221 people had been tested as of Monday. By noon, 75,296 of them were reported as having negative results, officials said.

Residents have volunteered to help with testing efforts. Li Wen was among the first from the May Fourth Square Community who had helped set up a testing site at 8 pm on Sunday.

"The sooner I'm tested, the sooner I can confirm my status, and that's good for my family and friends," Li said.

Xinhua contributed to this story.