A staff member works at a nucleic acid testing site in Xiqing District, north China's Tianjin, May 21, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Li Ran)
Residents queue for nucleic acid tests at a residential area in Xiqing District, north China's Tianjin, May 21, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Li Ran)
Residents take nucleic acid tests in Nankai District, north China's Tianjin, May 20, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Zhao Zishuo)
Residents register for nucleic acid tests at a residential area in Nankai District, north China's Tianjin, May 20, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Zhao Zishuo)
Residents take nucleic acid tests at a residential area in Nankai District, north China's Tianjin, May 20, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Zhao Zishuo)
Residents take nucleic acid tests at a residential area in Nankai District, north China's Tianjin, May 20, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Zhao Zishuo)
Residents queue for nucleic acid tests at a residential area in Jinnan District, north China's Tianjin, May 21, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Photo by Wang Fangyuan/Xinhua)
Residents take nucleic acid tests at a residential area in Jinnan District, north China's Tianjin, May 21, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Photo by Wang Fangyuan/Xinhua)
A resident takes nucleic acid test at a residential area in Nankai District, north China's Tianjin, May 20, 2022. Mass nucleic acid tests have been launched at 8 p.m. Friday in Tianjin's Nankai, Hongqiao, Hexi, Hedong and Heping districts in face of the recent COVID-19 outbreak. Other districts in the municipality carried out mass nucleic acid tests on Saturday. (Xinhua/Zhao Zishuo)
