Table II.
Baseline characteristics of HCWs in cohort 2
| Variable | No. of HCWs with SARS-CoV-2 infection |
|---|---|
| Age (years), median (IQR) | 28 (26–33) |
| Female sex | 23 (72%) |
| Initial severity | |
| Asymptomatic | 12 (38%) |
| Mild | 20 (62%) |
| Type of COVID-19 vaccine | |
| 2 doses of ChAdOx-nCoV-19 | 3 (9%) |
| 2 doses of mRNA-1273 | 1 (3%) |
| 2 doses of ChAdOx-nCoV-19, followed by BNT162b2 | 28 (88%) |
| Vaccination status | |
| 2-dose | 4 (12%) |
| 3-dose | 28 (88%) |
| Subvariants | |
| Omicron BA.1 | 14 (44%) |
| Omicron BA.2 | 18 (56%) |
| Symptoms | |
| Systemic | 23 (77%) |
| Gastrointestinal | 13 (43%) |
| Respiratory | 30 (100%) |
| Sensory | 10 (33%) |
| Time from last vaccination to infection (days), median (IQR) | 97 (82–108)a |
HCW, healthcare worker; IQR, interquartile range.
a
Including one HCW who did not remember the date of vaccination.