Table 1 WHO 8-point ordinal scale for clinical status assessment

Uninfected: No clinical or virological evidence of infection

0

Ambulatory, with no limitation of activities.

1

Ambulatory, with limitation of activities.

2

Hospitalized, not requiring supplemental oxygen

3

Hospitalized, requiring low-flow supplemental oxygen (mask or nasal prongs)

4

Hospitalized, on non-invasive ventilation or high-flow oxygen devices.

5

Hospitalized, intubated and mechanical ventilation.

6

Hospitalized, on invasive mechanical ventilation and additional organ support: extracorporeal membrane oxygenation (ECMO), renal replacement therapy, pressors.

7

Death

8