TABLE 2.
Sensitivities, specificities, and positive and negative likelihood ratios of serological methods investigated according to cutoff titers
| Method | Cutoff titer | Sensitivity (%) | Specificity (%) | LR+/LR− |
|---|---|---|---|---|
| IFA-IgM | 1:40 | 78.4 | 98.5 | 52.3/0.22 |
| 1:80 | 72.5 | 99.3 | 103.6/0.28 | |
| 1:160 | 56.8 | 99.9 | 568/0.43 | |
| IFA-IgG | 1:80 | 88.2 | 97.0 | 29.4/0.12 |
| 1:160 | 74.5 | 99.3 | 106.4/0.26 | |
| 1:320 | 56.8 | 99.3 | 81.1/0.44 | |
| ELISA-IgM | 0.449 | 88.2 | 94.8 | 17/0.12 |
| 0.9 | 86.3 | 97.8 | 39.2/0.14 | |
| 1.35 | 84.3 | 98.5 | 56.2/0.16 | |
| ELISA-IgG | 0.619 | 86.3 | 95.5 | 19.6/0.12 |
| 1.4 | 84.3 | 97.8 | 38.3/0.16 | |
| 1.8 | 70.6 | 98.5 | 47.1/0.30 |