Medical staff guide residents at a nucleic acid testing site in Qingdao, East China's Shandong Province, Oct. 14, 2020. (Photo: Xinhua)

The Chinese mainland reported 15 new confirmed COVID-19 cases Thursday, including six locally transmitted and nine imported cases, the National Health Commission said on Friday.

Four new locally transmitted case was detected in Sichuan province and two in Heilongjiang province, said the commission's daily report.

Five new imported cases were reported in Shanghai, three in Guangdong and one in Yunnan, the National Health Commission said in its daily report.

A total of 3,743 imported cases had been discharged from hospitals after recovery while 246 remained hospitalized, including three in severe conditions, the commission said.