A medical worker collects nucleic acid samples at a testing site in Xicheng District, Beijing, capital of China, Jan. 22, 2021. Beijing reported three new locally transmitted confirmed COVID-19 cases, one new locally transmitted asymptomatic infection and two new imported asymptomatic cases on Thursday, the municipal health commission said Friday. All the people living or working in the Dongcheng and Xicheng districts are undergoing nucleic acid testing for COVID-19 on Friday and Saturday, according to the districts' COVID-19 prevention and control work teams. (Xinhua/Zhang Yuwei)
