A citizen receives test at a nucleic acid testing point in Yangzhou, east China's Jiangsu Province, Aug. 5, 2021. Yangzhou started the third round of nucleic acid testing in its main urban districts on Thursday. (Photo: Xinhua)

A citizen receives test at a nucleic acid testing point in Yangzhou, east China's Jiangsu Province, Aug. 5, 2021. Yangzhou started the third round of nucleic acid testing in its main urban districts on Thursday. (Photo: Xinhua)

Citizens queue to receive test at a nucleic acid testing point in Yangzhou, east China's Jiangsu Province, Aug. 5, 2021. Yangzhou started the third round of nucleic acid testing in its main urban districts on Thursday. (Photo: Xinhua)

Citizens register ID information at a nucleic acid testing point in Yangzhou, east China's Jiangsu Province, Aug. 5, 2021. Yangzhou started the third round of nucleic acid testing in its main urban districts on Thursday. (Photo: Xinhua)

A citizen receives test at a nucleic acid testing point in Yangzhou, east China's Jiangsu Province, Aug. 5, 2021. Yangzhou started the third round of nucleic acid testing in its main urban districts on Thursday. (Photo: Xinhua)

Medical staff members disinfect the nucleic acid testing point in Yangzhou, east China's Jiangsu Province, Aug. 5, 2021. Yangzhou started the third round of nucleic acid testing in its main urban districts on Thursday. (Photo: Xinhua)