A staff member disinfects facilities at a subway station in Changsha, capital of central China's Hunan Province, Feb. 13, 2020. To ensure the safety of passengers, Changsha has stepped up various prevention measures at subway stations to curb the spread of the novel coronavirus, such as disinfection in subway stations and subway train carriages, temperature measuring, setting up new observation points and publicity of epidemic prevention information. (Xinhua/Chen Zeguo)

A staff member disinfects subway train carriage in Changsha, capital of central China's Hunan Province, Feb. 13, 2020. To ensure the safety of passengers, Changsha has stepped up various prevention measures at subway stations to curb the spread of the novel coronavirus, such as disinfection in subway stations and subway train carriages, temperature measuring, setting up new observation points and publicity of epidemic prevention information. (Xinhua/Chen Zeguo)

A staff member disinfects subway train carriage in Changsha, capital of central China's Hunan Province, Feb. 13, 2020. To ensure the safety of passengers, Changsha has stepped up various prevention measures at subway stations to curb the spread of the novel coronavirus, such as disinfection in subway stations and subway train carriages, temperature measuring, setting up new observation points and publicity of epidemic prevention information. (Xinhua/Chen Zeguo)

A passenger wearing face mask disinfects hands at a subway station in Changsha, capital of central China's Hunan Province, Feb. 13, 2020. To ensure the safety of passengers, Changsha has stepped up various prevention measures at subway stations to curb the spread of the novel coronavirus, such as disinfection in subway stations and subway train carriages, temperature measuring, setting up new observation points and publicity of epidemic prevention information. (Xinhua/Chen Zeguo)

A staff member measures a passenger's body temperature at a subway station in Changsha, capital of central China's Hunan Province, Feb. 13, 2020. To ensure the safety of passengers, Changsha has stepped up various prevention measures at subway stations to curb the spread of the novel coronavirus, such as disinfection in subway stations and subway train carriages, temperature measuring, setting up new observation points and publicity of epidemic prevention information. (Xinhua/Chen Zeguo)