Table 1.

Patient Status according to Clinical Severity of Coronavirus Disease 2019 (COVID-19) Pneumonia Confirmed with PCR and/or Chest CT Scan (13, 14)

Patient Status	Findings
Critical patient	Meet any of the followings: a. Respiratory distress, RR ≥30 times/min b. SpO2 <93% at rest c. PaO2/FiO2 ≤ 300 mmHg d. rapid progression (>50%) on CT imaging within 24-48 hours e. Respiratory failure, need mechanical assistance f. Shock g. “Extra pulmonary” organ failure, intensive care unit is needed
Symptomatic patient	Fever Respiratory symptoms Imaging findings of pneumonia
Mildly symptomatic patient/ history of exposure	Mild clinical symptoms [fever <38 (quelled without treatment), with or without cough, no dyspnea, no gasping, no chronic disease] No imaging findings of acute pneumonia Positive SARS-CoV-2 laboratory test or documented history of exposure to COVID-19 patient.
Healed patient/ Healthy individual	No fever for at least 3 days Significant improvement in chest radiologic findings and respiratory function Two consecutive negative SARS-CoV-2 laboratory test