Medical workers conduct sputum cleaning via bronchoscope for a COVID-19 patient at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

Song Liqiang, deputy director of the ICU (intensive care unit), checks the chest computed tomography (CT) of a COVID-19 patient at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

Director of the ICU (intensive care unit) Zhang Xijing (C) and deputy director Song Liqiang make ward rounds at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

A medical worker of the ICU (intensive care unit) conducts disinfection at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

A nurse of the ICU (intensive care unit) feeds meals to a COVID-19 patient in severe condition at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

Medical workers of the ICU (intensive care unit) discuss the therapeutic plan of a COVID-19 patient at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

A nurse of the ICU (intensive care unit) stares at the monitor at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

Zhang Xijing, director of the ICU (intensive care unit), inquires the condition of a COVID-19 patient at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

Zhang Xijing, director of the ICU (intensive care unit), checks the condition of a COVID-19 patient at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)

A nurse of the ICU (intensive care unit) changes an infusion bottle at the Huoshenshan (Fire God Mountain) Hospital in Wuhan, central China's Hubei Province, March 17, 2020. During the fight against the COVID-19, medical workers of the ICU of Huoshenshan Hospital work around the clock in rotations to race against time for saving the life of patients of the COVID-19 in severe and critical condition. (Xinhua/Wang Yuguo)