Residents take COVID-19 nucleic acid test in Changchun

A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 24, 2022. (Xinhua/Zhang Jian)

A medical worker takes a swab sample from a child for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 24, 2022. (Xinhua/Zhang Jian)

A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 24, 2022. (Xinhua/Zhang Jian)

A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 24, 2022. (Photo by Wu Ran/Xinhua)