A resident receives nucleic acid test at a testing site in Xincheng District of Xi'an, northwest China's Shaanxi Province, Jan. 4, 2022. Xi'an launched a new round of all-inclusive nucleic acid testing on Tuesday to help curb the spread of COVID-19. (Xinhua/Tao Ming)
A kid receives nucleic acid test at a testing site in Xincheng District of Xi'an, northwest China's Shaanxi Province, Jan. 4, 2022. Xi'an launched a new round of all-inclusive nucleic acid testing on Tuesday to help curb the spread of COVID-19. (Xinhua/Tao Ming)
A resident receives nucleic acid test at a testing site in Xincheng District of Xi'an, northwest China's Shaanxi Province, Jan. 4, 2022. Xi'an launched a new round of all-inclusive nucleic acid testing on Tuesday to help curb the spread of COVID-19. (Xinhua/Tao Ming)
A kid receives nucleic acid test at a testing site in Xincheng District of Xi'an, northwest China's Shaanxi Province, Jan. 4, 2022. Xi'an launched a new round of all-inclusive nucleic acid testing on Tuesday to help curb the spread of COVID-19. (Xinhua/Tao Ming)