A medical worker collects a swab sample from a boy at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Manyi)
A medical worker disinfects a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Long)
A medical worker shows a QR code for citizens to scan at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Manyi)
A medical worker collects a swab sample from a resident at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Long)
Medical workers help citizens to scan a QR code at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Long)
A medical worker collects a swab sample from a resident at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Manyi)
A medical worker guides citizens at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Long)
A medical worker guides citizens to scan a QR code at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Long)
A medical worker checks a citizen's personal information at a COVID-19 testing site in Xining, northwest China's Qinghai Province, Nov. 6, 2021. Xining has set up 484 testing sites in downtown districts for massive COVID-19 nucleic acid testing. (Xinhua/Zhang Manyi)
