A medical worker collects a swab sample from a child at a community COVID-19 testing site in Xinhua District of Shijiazhuang, capital of north China's Hebei Province, Jan. 20, 2021. Shijiazhuang on Wednesday launched the third round of citywide nucleic acid testing, which is going to be completed within three days. (Photo by Liang Zidong/Xinhua)
