People queue up for nucleic acid tests at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 19, 2022. Changchun launched the sixth round of mass nucleic acid testing in key areas on Saturday. (Photo by Zhang Yang/Xinhua)
A medical worker takes a swab sample from a man for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 19, 2022. Changchun launched the sixth round of mass nucleic acid testing in key areas on Saturday. (Photo by Zhang Yang/Xinhua)
People queue up for nucleic acid tests at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 19, 2022. Changchun launched the sixth round of mass nucleic acid testing in key areas on Saturday. (Photo by Zhang Yang/Xinhua)
Medical workers take swab samples from residents for nucleic acid tests at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 19, 2022. Changchun launched the sixth round of mass nucleic acid testing in key areas on Saturday. (Photo by Zhang Yang/Xinhua)
