NW China's Lanzhou launches 24-hour nucleic acid testing services (4)

Medical workers collect swab samples at a nucleic acid testing site in Chengguan District of Lanzhou City, northwest China's Gansu Province, Oct. 21, 2021. As of 8 p.m. Wednesday, Lanzhou has registered a total of eight locally transmitted confirmed COVID-19 cases and one asymptomatic case since new local infections were reported. Local authorities set up hundreds of nucleic acid testing sites to provide 24-hour testing services for the residents. (Xinhua/Fan Peishen)