A medical worker takes a a swab sample from a citizen for nucleic acid testing in Xining, northwest China's Qinghai Province, Oct. 28, 2021. After Xining reported 3 new COVID-19 cases, local control of epidemic prevention has been strengthened.Photo:Xinhua
People queue up for nucleic acid testing in Xining, northwest China's Qinghai Province, Oct. 28, 2021.Photo:Xinhua
Aerial photo taken on Oct. 28, 2021 shows people queueing up to receive nucleic acid tests in Xining, northwest China's Qinghai Province.Photo:Xinhua
A medical worker takes a a swab sample from a citizen for nucleic acid testing in Xining, northwest China's Qinghai Province, Oct. 28, 2021.Photo:Xinhua
A medical worker takes a a swab sample from a citizen for nucleic acid testing in Xining, northwest China's Qinghai Province, Oct. 28, 2021.Photo:Xinhua