Table 1

Patient state according to WHO clinical progression scale

Patient stateClinical characteristicsSeverity score
UninfectedUninfected, no viral RNA detected0
Ambulatory mild diseaseAsymptomatic, viral RNA detected1
Symptomatic, independent2
Symptomatic, assistance needed3
Hospitalised, moderate diseaseHospitalised, no oxygen therapy4
Hospitalised, oxygen by mask or nasal prongs5
Hospitalised, severe diseaseHospitalised, oxygen by non-invasive ventilation (NIV) or high flow6
Intubation and mechanical ventilation, pO2/FiO2≥150 or SpO2/FiO2≥2007
Mechanical ventilation, pO2/FiO2<150 (SpO2/FiO2<200) or vasopressors8
Mechanical ventilation, pO2/FiO2<150 and vasopressors, dialysis, or extracorporeal membrane oxygenation (ECMO)9