Medical workers take swab samples from citizens for nucleic acid tests during a rainy day in Chengxi District of Xining, northwest China's Qinghai Province, May 8, 2022. (Xinhua/Fan Peishen)
A medical worker takes a swab sample from a kid for a nucleic acid test during a rainy day in Chengxi District of Xining, northwest China's Qinghai Province, May 8, 2022. (Xinhua/Liu Zexing)
People line up for nucleic acid tests during a rainy day in Chengxi District of Xining, northwest China's Qinghai Province, May 8, 2022. (Xinhua/Zhou Shengsheng)
A medical worker takes a swab sample from a kid for a nucleic acid test during a rainy day in Chengxi District of Xining, northwest China's Qinghai Province, May 8, 2022. (Xinhua/Zhang Ziqi)
