Medical workers from the Affiliated Hospital of Qingdao University sit to keep a distance from each other on the bus to prevent possible cross infection as they return to the hotel after work in Wuhan, central China's Hubei Province, Feb. 20, 2020. To better protect medical workers, some targeted and precise prevention measures are strictly taken during work time and off-work time by medical staff of the Affiliated Hospital of Qingdao University who are in Hubei to aid the fight against the virus. (Xinhua/Cai Yang)