A medical worker takes a swab sample from a child for nucleic acid test at a community in Dongjing Township, Songjiang District of Shanghai, east China, March 13, 2022. (Xinhua/Zhang Jiansong)
Medical workers take swab samples from residents for nucleic acid test at a community in Dongjing Township, Songjiang District of Shanghai, east China, March 13, 2022. (Xinhua/Zhang Jiansong)
A medical worker registers information for nucleic acid test at a community in Dongjing Township, Songjiang District of Shanghai, east China, March 13, 2022. (Xinhua/Zhang Jiansong)
