A medical worker prepares to take a swab sample from a resident for nucleic acid testing in Henantun Village of Xingfu Town in Heihe, northeast China's Heilongjiang Province, Nov. 7, 2021.Photo:Xinhua
A medical worker takes a swab sample from a resident for nucleic acid testing in Henantun Village of Xingfu Town in Heihe, northeast China's Heilongjiang Province, Nov. 7, 2021.Photo:Xinhua
A medical worker takes a swab sample from a resident for nucleic acid testing in Henantun Village of Xingfu Town in Heihe, northeast China's Heilongjiang Province, Nov. 7, 2021.Photo:Xinhua
Residents queue for nucleic acid testing in Henantun Village of Xingfu Town in Heihe, northeast China's Heilongjiang Province, Nov. 7, 2021.Photo:Xinhua