Shanghai residents leave hotel quarantine

"They have obvious epidemiological relationships with the previous cases and are not new individual cases from nowhere," said Wu, who is vice-dean of Fudan University Shanghai Medical College. "This shows that the risk of the current wave of epidemic is still controllable."

The health commission said residents from the Zhaotong Road residential neighborhood who are related to the new cases will continue their centralized quarantine.

Renji Hospital's west campus will resume outpatient clinic services on Monday and the Shanghai Cancer Center Affiliated with Fudan University will follow suit on Tuesday, the medical institutions announced on Thursday.

The cancer center said on Jan 20 that an outsourced logistics worker at the hospital returned a suspicious test result for novel coronavirus during a regular test of staff members.

The next day, Renji Hospital said a logistics worker there had also returned a suspicious test result. The two men and a friend of one of them were the first cases in the current wave of infection.

The Chinese mainland recorded 30 new confirmed COVID-19 cases on Wednesday, including 17 locally transmitted ones, the National Health Commission said on Thursday.

Of the locally transmitted cases, eight were reported in Jilin province, four in Heilongjiang province, three in Shanghai, and two in Hebei province, the commission said.

There were 135 COVID-19 patients discharged from hospitals on Wednesday following their recovery, it said.

Xinhua contributed to this story.