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)
Lanzhou launches nucleic acid testing in Chengguan District
Source: Xinhua| 2021-10-19 21:42:12|Editor: huaxia