Severity | Symptoms |
---|---|
Asymptomatic | Positive test for SARS-CoV-2 but no symptoms |
Mild illness | Any signs and symptoms (e.g., fever, cough, sore throat, malaise, headache, muscle pain) without shortness of breath, dyspnea, or abnormal chest imaging. |
Moderate illness | Evidence of lower respiratory disease by clinical assessment or imaging and a saturation of oxygen (SaO2) > 93% on room air at sea level. |
Severe illness | Respiratory frequency > 30 breaths per minute, SaO2 ≤ 93% on room air at sea level, ratio of arterial partial pressure of oxygen to fraction of inspired oxygen (PaO2/FiO2) < 300, or lung infiltrates > 50%. |
Critical illness | Respiratory failure, septic shock, and/or multiple organ dysfunction. |