In this aerial photo, residents queue up for COVID-19 nucleic acid tests at a testing site in Jiangdu District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Photo by Yu Xing/Xinhua)
In this aerial photo, residents queue up for COVID-19 nucleic acid tests at a testing site in Hanjiang District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Photo by Meng Delong/Xinhua)
A medical worker takes a swab sample from a woman at a COVID-19 nucleic acid testing site in Jiangdu District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Photo by Yu Xing/Xinhua)
A medical worker checks a resident's information before taking a swab sample at a COVID-19 nucleic acid testing site in Hanjiang District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Photo by Meng Delong/Xinhua)
A medical worker takes a swab sample from a woman at a COVID-19 nucleic acid testing site in Hanjiang District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Photo by Meng Delong/Xinhua)
Aerial photo taken on Aug. 9, 2021 shows a COVID-19 nucleic acid testing site in Guangling District of Yangzhou, east China's Jiangsu Province. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Xinhua/Li Bo)
A medical worker takes a swab sample from a woman at a COVID-19 nucleic acid testing site in Guangling District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Xinhua/Li Bo)
Aerial photo taken on Aug. 9, 2021 shows a COVID-19 nucleic acid testing site in Guangling District of Yangzhou, east China's Jiangsu Province. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Xinhua/Li Bo)
Residents register for COVID-19 nucleic acid tests at a testing site in Guangling District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Xinhua/Li Bo)
A medical worker disinfects a colleague at a COVID-19 nucleic acid testing site in Guangling District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Xinhua/Li Bo)
A community service worker puts on a face shield at a COVID-19 nucleic acid testing site in Guangling District of Yangzhou, east China's Jiangsu Province, Aug. 9, 2021. The city of Yangzhou has launched its fifth round of COVID-19 mass testing on Monday. (Xinhua/Li Bo)
