A medical worker takes a swab sample from a resident for nucleic acid testing at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
A medical worker takes a swab sample from a resident for nucleic acid testing at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
A medical worker warms hands with bottles filled with hot water at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
A medical worker registers information of a resident for nucleic acid testing at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
A medical worker takes a swab sample from a resident for nucleic acid testing at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
A medical worker works at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
A medical worker takes a swab sample from a child for nucleic acid testing at a sampling site in Manzhouli, north China's Inner Mongolia Autonomous Region, Dec. 1, 2021. Manzhouli launched a fourth round of all-inclusive nucleic acid testing on Wednesday since new locally transmitted confirmed COVID-19 cases were reported. (Xinhua/Li Zhipeng)
