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| Time between first and second seropositive result (days) | Antibody titer at first seropositive result | Antibody titer after four weeks of first seropositive result | Antibody titer at second seropositive result | Antibody titer after four weeks of second seropositive result |
|---|---|---|---|---|
| 55 | 1:80 | 1:160 | 1:40 | 1:80 |
| 48 | Negative | Negative | Negative | Negative |
| 69 | Negative | Negative | 1:40 | 1:160 |
| 48 | Negative | Negative | 1:160 | Negative |
