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, April 7, 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, April 7, 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, April 7, 2022. (Xinhua/Zhang Jian)
