inclusion criteria: 1. male or female, aged at 18 years (including) -75 years old 2. hospitalized 3. laboratory confirmation of sars-cov-2 infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source 4. pneumonia that is judged by computed tomography 5. in accordance with any one of the following : 1)dyspnea (rr ≥ 30 times / min), 2)finger oxygen saturation ≤ 93% in resting state, 3)arterial oxygen partial pressure (pao2) / oxygen absorption concentration (fio2) ≤ 300mmhg, 4)pulmonary imaging shows that the focus progress \> 50% in 24-48 hours 6. interstitial lung damage is judged by computed tomography.

inclusion criteria: 1. male or female, aged at 18 years (including) -75 years old 2. hospitalized 3. laboratory confirmation of sars-cov-2 infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source 4. pneumonia that is judged by computed tomography 5. in accordance with any one of the following : 1)dyspnea (rr ≥ 30 times / min), 2)finger oxygen saturation ≤ 93% in resting state, 3)arterial oxygen partial pressure (pao2) / oxygen absorption concentration (fio2) ≤ 300mmhg, 4)pulmonary imaging shows that the focus progress \> 50% in 24-48 hours 6. interstitial lung damage is judged by computed tomography.

inclusion criteria: male or female, aged at 18 years (including) -75 years old hospitalized laboratory confirmation of sars-cov-2 infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source pneumonia that is judged by computed tomography in accordance with any one of the following : 1)dyspnea (rr ≥ 30 times / min), 2)finger oxygen saturation ≤ 93% in resting state, 3)arterial oxygen partial pressure (pao2) / oxygen absorption concentration (fio2) ≤ 300mmhg, 4)pulmonary imaging shows that the focus progress > 50% in 24-48 hours interstitial lung damage is judged by computed tomography.

inclusion criteria: male or female, aged at 18 years (including) -75 years old hospitalized laboratory confirmation of sars-cov-2 infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source pneumonia that is judged by computed tomography in accordance with any one of the following : 1)dyspnea (rr ≥ 30 times / min), 2)finger oxygen saturation ≤ 93% in resting state, 3)arterial oxygen partial pressure (pao2) / oxygen absorption concentration (fio2) ≤ 300mmhg, 4)pulmonary imaging shows that the focus progress > 50% in 24-48 hours interstitial lung damage is judged by computed tomography.

inclusion criteria: 1. male or female, aged at 18 years (including) -75 years old 2. hospitalized 3. laboratory confirmation of sars-cov-2 infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source 4. pneumonia that is judged by computed tomography 5. in accordance with any one of the following : 1)dyspnea (rr ≥ 30 times / min), 2)finger oxygen saturation ≤ 93% in resting state, 3)arterial oxygen partial pressure (pao2) / oxygen absorption concentration (fio2) ≤ 300mmhg, 4)pulmonary imaging shows that the focus progress > 50% in 24-48 hours 6. interstitial lung damage is judged by computed tomography.

inclusion criteria: 1. male or female, aged at 18 years (including) -75 years old 2. hospitalized 3. laboratory confirmation of sars-cov-2 infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source 4. pneumonia that is judged by computed tomography 5. in accordance with any one of the following : 1)dyspnea (rr ≥ 30 times / min), 2)finger oxygen saturation ≤ 93% in resting state, 3)arterial oxygen partial pressure (pao2) / oxygen absorption concentration (fio2) ≤ 300mmhg, 4)pulmonary imaging shows that the focus progress > 50% in 24-48 hours 6. interstitial lung damage is judged by computed tomography.