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| Titer | Differences in titers, N of samples | ||
|---|---|---|---|
| Identical | Positive or negative (2-fold) | > 2-fold | |
| 1:80 | 1 | 1 | 1 |
| 1:160 | 5 | 4 | |
| 1:320 | 4 | 3 | |
| 1:640 | 3 | 13 | 6 |
| Total (%) | 13 (31.7) | 21 (51.2) | 7 (17.1) |
