A medical worker collects nucleic acid sample at a testing site in a primary school in Harbin, northeast China's Heilongjiang Province, Jan. 22, 2021. Citizens in Harbin have been undergoing nucleic acid testing for the COVID-19 prevention and control. (Xinhua/Wang Jianwei)
Nucleic acid testing undergoing in NE China's Harbin
Source: Xinhua| 2021-01-23 07:21:53|Editor: huaxia