A medical worker takes a swab sample from a resident for nucleic acid testing in Beilin District of Xi'an, capital of northwest China's Shaanxi Province, Dec. 29, 2021. (Xinhua/Zhang Bowen) 

Xi'an, capital of northwest China's Shaanxi Province, reported 13 new confirmed locally transmitted COVID-19 cases on Monday, local authorities said Tuesday.

The city had registered 2,017 local cases amid the latest resurgence. Of these, 417 had recovered by Monday.

The city kicked off a new round of mass testing in key areas at 9 a.m. Tuesday to further curb the spread of the virus, said Lyu Yongpeng, deputy director of the city's health commission.