Positive PCR test The life-threatening disease is defined as respiratory failure dyspnea respiratory frequency ≥ 30/min blood oxygen saturation ≤ 93% partial pressure of arterial oxygen to fraction of inspired oxygen ratio < 300 lung infiltrates > 50% within 24 to 48 hours

Positive PCR test The life-threatening disease is defined as respiratory failure dyspnea respiratory frequency ≥ 30/min blood oxygen saturation ≤ 93% partial pressure of arterial oxygen to fraction of inspired oxygen ratio < 300 lung infiltrates > 50% within 24 to 48 hours