| Class | n | Characteristic |
|---|---|---|
| HCW | 324 | Healthy healthcare workers (control) |
| 1 | 29 | SARS-CoV-2-infected patients who during their hospitalization did not require any external oxygen supply |
| 2 | 62 | SARS-CoV-2-infected patients who required low or high flow oxygen supply |
| 3 | 20 | SARS-CoV-2-infected patients who required positive airway pressure (biphasic; BIPAP or continuous; CPAP) or were intubated |
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