When night falls, shift workers in Wuhan, Hubei province, take part in efforts to control the novel coronavirus pneumonia outbreak.

Physician Wang Ke (second from left), a member of one of Wuhan's 120 first-aid teams, helps to pull a patient out of an ambulance, on Feb 18, 2020. He often works from 4:30 pm to 8:30 am. CHEN LIANG/FOR CHINA DAILY