Medical workers work for COVID-19 nucleic acid testing in Lanzhou, Northwest China's Gansu province, on Oct 26, 2021. [Photo/VCG]

LANZHOU -- Lanzhou, capital of Northwest China's Gansu province, has started the fifth round of all-inclusive nucleic acid testing amid the resurgence of COVID-19 cases.

Gansu reported 11 new locally transmitted confirmed COVID-19 cases on Friday, including five in Lanzhou, four in the city of Tianshui and two in the city of Zhangye, according to the provincial health commission.

From Oct 18 to 29, Gansu had logged 86 locally transmitted cases in the recent COVID-19 resurgence.

By the end of Friday, the province had traced 4,700 close contacts and 28,800 secondary close contacts of confirmed cases.