
A medical worker takes a throat swab sample from a woman at a nucleic acid testing site in Yangzhou, east China's Jiangsu Province, Aug. 14, 2021. The city of Yangzhou launched a new round of mass nucleic acid testing in key areas on Saturday.Photo:Xinhua

Residents queue up to receive nucleic acid tests at a testing site in Yangzhou, east China's Jiangsu Province, Aug. 14, 2021. The city of Yangzhou launched a new round of mass nucleic acid testing in key areas on Saturday.Photo:Xinhua

Residents queue up to receive nucleic acid tests at a testing site in Yangzhou, east China's Jiangsu Province, Aug. 14, 2021. The city of Yangzhou launched a new round of mass nucleic acid testing in key areas on Saturday.Photo:Xinhua

A medical worker takes a throat swab sample from a woman at a nucleic acid testing site in Yangzhou, east China's Jiangsu Province, Aug. 14, 2021. The city of Yangzhou launched a new round of mass nucleic acid testing in key areas on Saturday. Photo:Xinhua

Residents register for nucleic acid tests at a testing site in Yangzhou, east China's Jiangsu Province, Aug. 14, 2021. The city of Yangzhou launched a new round of mass nucleic acid testing in key areas on Saturday.Photo:Xinhua