Table 2 Characteristics of three participants with positive SARS-CoV-2 nasopharyngeal swab after positive baseline serology
HCW 1 | HCW 2 | HCW 3 | |
|---|---|---|---|
Sex | Female | Female | Male |
Age range at re-infection | 50–55 | 50–55 | 40–45 |
Blood group | Unknown | B | B |
Comorbidities | None | Pollen allergy | Pollen allergy |
Profession | Nurse (assistant) | Nurse (assistant) | Nurse (assistant) |
Patient contact | Administrative | Administrative/caring | Administrative |
First positive PCR | March 2020 | Date unknown | March 2020 |
Date baseline serology | July 2020 | July 2020 | June 2020 |
Anti-spike titers (units/ml), cut-off for positivity 0.8 | 25.8 | 244 | 30 |
Second positive test (method) | January 2021 (PCR) | January 2021 (PCR) | January 2021 (PCR) |
Days baseline to second episode | 198 | 200 | 220 |
Days first to second episode | 297 | Unknown | 314 |
Negative tests between first and second episode | None | None | One |
Symptoms second test | Sore throat, coryza, headache, limb/muscle pain, eye irritation, weakness | None | Headache, dizziness, diarrhea, shivering, limb/muscle pain, eye irritation, weakness |
Exposure | Patients | Patients | Patients, household |
Number or household members | One | One | One |
COVID-19 vaccine | None | None | First dose in week of positive test |