A staff member of epidemic prevention and control is seen at a residential compound, identified as a medium-risk area for COVID-19, in Huanggu District in Shenyang, northeast China's Liaoning Province, Jan. 6, 2021. Chinese cities are tightening control measures to tackle the resurgence of the novel coronavirus through the winter months following recent sporadic spikes in confirmed cases. Anti-epidemic workers stand fast at their positions regardless of the heavy wind and cold weather to support those in need. (Xinhua/Yao Jianfeng)