Nanjing implements citywide nucleic acid test(1/4)

Medical workers take nucleic acid samples for the public at a temporary test station in Wutaishan Gymnasium, Nanjing, Jiangsu Province, July 22, 2021. The city has begun a citywide nucleic acid test since Wednesday in order to prevent the spread of the COVID-19. The sampling work is proceeding well so far. (Photo: China News Service/Yang Bo)

Medical workers take nucleic acid samples for the public at a temporary test station in Wutaishan Gymnasium, Nanjing, Jiangsu Province, July 22, 2021. The city has begun a citywide nucleic acid test since Wednesday in order to prevent the spread of the COVID-19. The sampling work is proceeding well so far. (Photo: China News Service/Yang Bo)

Medical workers take nucleic acid samples for the public at a temporary test station in Wutaishan Gymnasium, Nanjing, Jiangsu Province, July 22, 2021. The city has begun a citywide nucleic acid test since Wednesday in order to prevent the spread of the COVID-19. The sampling work is proceeding well so far. (Photo: China News Service/Yang Bo)

Medical workers take nucleic acid samples for the public at a temporary test station in Wutaishan Gymnasium, Nanjing, Jiangsu Province, July 22, 2021. The city has begun a citywide nucleic acid test since Wednesday in order to prevent the spread of the COVID-19. The sampling work is proceeding well so far. (Photo: China News Service/Yang Bo)