Yang Hongke works in a testing lab of KingMed Diagnostics Group Co., Ltd. in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Yang Hongke, 28, technical head of genome at Shijiazhuang KingMed Diagnostics testing lab, has been working in the nucleic acid testing lab since Jan. 6, when Shijiazhuang started citywide nucleic acid testing. She also aided Wuhan in nucleic acid testing from February to April last year. (Xinhua/Mu Yu)