Medical workers work at a nucleic acid testing site in Chengguan District of Lanzhou, northwest China's Gansu Province, Oct. 19, 2021. Lanzhou launched nucleic acid testing on Tuesday for residents living or working near medium-risk areas in Chengguan District. (Xinhua/Chen Bin)
Medical workers work at a nucleic acid testing site in Chengguan District of Lanzhou, northwest China's Gansu Province, Oct. 19, 2021. Lanzhou launched nucleic acid testing on Tuesday for residents living or working near medium-risk areas in Chengguan District. (Xinhua/Chen Bin)
Medical workers prepare to disinfect a nucleic acid testing site in Chengguan District of Lanzhou, northwest China's Gansu Province, Oct. 19, 2021. Lanzhou launched nucleic acid testing on Tuesday for residents living or working near medium-risk areas in Chengguan District. (Xinhua/Chen Bin)
A medical worker collects swab sample from a resident for nucleic acid testing in Chengguan District of Lanzhou, northwest China's Gansu Province, Oct. 19, 2021. Lanzhou launched nucleic acid testing on Tuesday for residents living or working near medium-risk areas in Chengguan District. (Xinhua/Chen Bin)
A medical worker collects swab sample from a resident for nucleic acid testing in Chengguan District of Lanzhou, northwest China's Gansu Province, Oct. 19, 2021. Lanzhou launched nucleic acid testing on Tuesday for residents living or working near medium-risk areas in Chengguan District. (Xinhua/Chen Bin)
Residents queue up for nucleic acid testing at a testing site in Chengguan District of Lanzhou, northwest China's Gansu Province, Oct. 19, 2021. Lanzhou launched nucleic acid testing on Tuesday for residents living or working near medium-risk areas in Chengguan District. (Xinhua/Chen Bin)
