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Nanjing carries out citywide nucleic acid testing

Medical workers take swab samples from residents for COVID-19 test at a testing site in Nanjing, east China's Jiangsu Province, July 21, 2021. Nanjing, which has a population of more than 9.3 million, carried out citywide nucleic acid testing starting on Wednesday. (Xinhua/Li Bo)

[ Editor: Zhang Zhou ]