Table 1. Baseline characteristics of 1879 HCWs.

Characteristics	Total
Gender:
male	266 (14.2%)
female	1,613 (85.8%)
Age, median (IQR) years	48 (38‒56)
Professional category:a
nurse	639 (34.0%)
physician	371 (19.7%)
other with direct patient contact	226 (12.0%)
other without direct patient contact	643 (34.2%)
Healthcare department:b
clinical	1,332 (70.9%)
non-clinical	547 (29.1%)
Previously tested for SARS-CoV-2 RNA
yesc	417 (22.2%)
no	1,462 (77.8%)
Quarantined or isolated:
yesd	56 (3.0%)
no	1,823 (97.0%)

^aother with direct patient contact: patient care technician (67), physical therapist (43), radiation therapist (37), psychologist (21), medical assistant (11), audiologist (10), pedagogue (9), speech pathologist (8), clinic engineer (6), medical technician (6), dental assistant (4), anthropologist (4); other without direct patient contact: office worker (228), secretary (136), laboratory worker (110), kitchen worker (34), pharmacist (32), dietician (27), medical sterilization technician (19), driver (17), labourer (15), store person (8), IT worker (7), public health worker (3), manager (2), security officer (2), chaplain (2), parking attendant (1).

^bclinical departments include: medical (765), surgical (222), auxiliary medical (123), ambulatory (116), intensive care (106); non-clinical departments include: administration (284), laboratory (113), maintenance (116), pharmacy (34).

^c median period between SARS-CoV-2 RNA and serology testing was 77 days (range 1–136 days; IQR 39‒122 days); 4 out of 417 (0.96%) HCWs had positive test results.

^d median period between the start of quarantine/isolation and serology testing was 97.5 days (range 10‒133 days; IQR 42.5‒126 days).