| abs | antibodies |
| CRP | C-reactive protein |
| ELISA | enzyme linked immunosorbent assay |
| HCS | health care system |
| HCWs | healthcare workers |
| HCU | healthcare unit |
| IgA(+) | immunoglobulin A seropositive |
| IgG(+) | immunoglobulin G seropositive |
| IgM(+) | immunoglobulin M seropositive |
| IQR | interquartile range |
| NHCWs | non-HCWs, non-healthcare workers |
| RT-PCR | reverse transcription polymerase chain reaction |
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