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Table 1 Classification of patients with COVID-19 according to symptom severity

From: Risk factors for disease progression in COVID-19 patients

Classification

Classification criteria

Asymptomatic

Asymptomatic or body temperature < 37.5 °C

Mild

Body temperature ≥ 37.5 °C but O2 supply not required

Moderate

O2 supply via nasal or venturi mask required

Severe

High-flow O2 supply or mechanical ventilation required