Residents queue for nucleic acid tests for COVID-19 screening at a residential area in Yuhong District, Shenyang, northeast China's Liaoning Province, Jan. 5, 2021. Shenyang started conducting a second round of nucleic acid tests for residents in Huanggu, Yuhong and Tiexi districts to screen for coronavirus infections following recent reports of locally transmitted confirmed COVID-19 cases. The screening is expected to be completed within three days. (Xinhua/Yao Jianfeng)