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Asymptomatic
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Positive test for SARS-CoV-2 but no symptoms
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Mild illness
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Any signs and symptoms (e.g., fever, cough, sore throat, malaise, headache, muscle pain) without shortness of breath, dyspnea, or abnormal chest imaging.
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Moderate illness
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Evidence of lower respiratory disease by clinical assessment or imaging and a saturation of oxygen (SaO2) > 93% on room air at sea level.
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Severe illness
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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%.
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Critical illness
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Respiratory failure, septic shock, and/or multiple organ dysfunction.
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