Medical workers register information for citizens at the nucleic acid testing site in a primary school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Wang Jianwei)
A medical worker disinfects for a citizen at the nucleic acid testing site in a primary school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Wang Jianwei)
A medical worker collects nucleic acid sample at the testing site in a high school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Wang Jianwei)
A medical worker collects nucleic acid sample at the testing site in a primary school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Wang Jianwei)
A medical worker arranges nucleic acid samples at the testing site in a primary school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Wang Jianwei)
A medical worker disinfects medical equipment at the nucleic acid testing site in a primary school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Wang Jianwei)
Citizens scan their health codes at the nucleic acid testing site in a high school in Harbin, capital of northeast China's Heilongjiang Province, Jan. 22, 2021. Despite the extreme cold weather in Harbin, COVID-19 prevention and control workers stuck to their posts maintaining order and collecting nucleic acid samples. (Xinhua/Xie Jianfei)
