A community staff member checks the name list of residents for door-to-door nucleic acid testing during the latest COVID-19 outbreak in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Oct. 23, 2021. Thousands of medical workers are on duty around the clock at more than 500 sampling sites in key districts of Yinchuan to conduct the test. (Xinhua/Feng Kaihua)
