Subjects who met all of the following conditions entered the trial: 1. Male or female patients aged 16 to 75 years, 2. willing to sign informed consent, 3. Based on the criteria for suspected cases of COVID-19 infection, sputum, throat swabs, lower respiratory tract secretions and other specimens were tested for positive COVID-19 nucleic acid by real-time fluorescent RT-PCR, or viral gene sequencing was performed with known COVID- 19 highly homologous, 4. The imaging findings are consistent with pneumonia.

Subjects who met all of the following conditions entered the trial: 1. Male or female patients aged 16 to 75 years, 2. willing to sign informed consent, 3. Based on the criteria for suspected cases of COVID-19 infection, sputum, throat swabs, lower respiratory tract secretions and other specimens were tested for positive COVID-19 nucleic acid by real-time fluorescent RT-PCR, or viral gene sequencing was performed with known COVID- 19 highly homologous, 4. The imaging findings are consistent with pneumonia.