Staff members step into an airplane to conduct disinfection operation after all the passengers left at the Haikou Meilan International Airport in Haikou, south China's Hainan Province, Jan. 31, 2020. China Southern Airlines has strengthened its efforts on the prevention and control of the novel coronavirus, demanding all the facilities inside the cabin to be disinfected after flight. (Photo by Pu Xiaoxu/Xinhua)