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| Characteristic | No. (%) | |
|---|---|---|
| Analyte | ||
| IgM antibodies | 48 (66.7) | |
| IgG antibodies | 15 (20.8) | |
| Antibodies | 2 (2.8) | |
| Antigen | 7 (9.7) | |
| Index test | ||
| Commercial assay | 39 (54.2) | |
| In-house developed assay | 33 (45.8) | |
| Index test format | ||
| ELISA-based | 46 (63.9) | |
| Rapid test | 20 (27.8) | |
| Immunofluorescence assay | 6 (8.3) | |
| Study design | ||
| Cohort | 17 (23.6) | |
| Case-control | 18 (25) | |
| Partial cohort and partial case-control | 37 (51.4) | |
