Patients who recovered from novel coronavirus pneumonia (NCP) leave the Taikang Tongji Hospital in Wuhan, central China's Hubei Province, Feb. 19, 2020. A total of 13 patients infected with NCP recovered and were discharged on Wednesday in Taikang Tongji Hospital. (Xinhua/Shen Bohan)

Patients who recovered from novel coronavirus pneumonia (NCP) leave the Taikang Tongji Hospital in Wuhan, central China's Hubei Province, Feb. 19, 2020. A total of 13 patients infected with NCP recovered and were discharged on Wednesday in Taikang Tongji Hospital. (Xinhua/Shen Bohan)

Patients who recovered from novel coronavirus pneumonia (NCP) pose for photos with medical staff in the Taikang Tongji Hospital in Wuhan, central China's Hubei Province, Feb. 19, 2020. A total of 13 patients infected with NCP recovered and were discharged on Wednesday in Taikang Tongji Hospital. (Xinhua/Shen Bohan)

A patient who recovered from novel coronavirus pneumonia (NCP) leaves the Taikang Tongji Hospital in Wuhan, central China's Hubei Province, Feb. 19, 2020. A total of 13 patients infected with NCP recovered and were discharged on Wednesday in Taikang Tongji Hospital. (Xinhua/Shen Bohan)