A medical worker works at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
Photo taken on March 18, 2022 shows a view of mobile testing labs for COVID-19 at an exhibition and sports center in Harbin, northeast China's Heilongjiang Province. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 16, 2022. (Xinhua/Xie Jianfei)
People receive nucleic acid tests at a temporary COVID-19 testing site at an expressway toll station in Harbin, northeast China's Heilongjiang Province, March 14, 2022. (Xinhua/Xie Jianfei)
A medical worker tests equipments at a mobile testing lab for COVID-19 in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 15, 2022. (Xinhua/Xie Jianfei)
People receive nucleic acid tests at a temporary COVID-19 testing site at an expressway toll station in Harbin, northeast China's Heilongjiang Province, March 14, 2022. (Xinhua/Xie Jianfei)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Harbin, northeast China's Heilongjiang Province, March 18, 2022. (Xinhua/Xie Jianfei)
