RT-PCR Confirm the infection in the throat swab or sputum or lower respiratory tract samples. Sign the Informed Consent Form on a voluntary basis. Meet any of the following criteria for severe or critical ill conditions:Respiratory rate >=30/min; orRest SPO2<=90%; orPaO2/FiO2<=300mmHg; orRespiratory failure and needs mechanical ventilation; orMultiple organ failure and needs ICU monitoring

RT-PCR Confirm the infection in the throat swab or sputum or lower respiratory tract samples. Sign the Informed Consent Form on a voluntary basis. Meet any of the following criteria for severe or critical ill conditions:Respiratory rate >=30/min; orRest SPO2<=90%; orPaO2/FiO2<=300mmHg; orRespiratory failure and needs mechanical ventilation; orMultiple organ failure and needs ICU monitoring