Table 2.
Comparison of eight FeLV test systems in
| Tests | Witness | Snap Combo Plus | Fastest | Duo Speed | Virachek FeLV | PetChek FeLV | One-Step Mapic FeLV | |
|---|---|---|---|---|---|---|---|---|
| Companies | Synbiotics | IDEXX | MegaCor | Bio Veto Test | Synbiotics | IDEXX | Biotech | EVL |
| Countries | USA | USA | Germany | France | USA | USA | USA | Netherlands |
| Invalid tests (%) | 1.3 | 0.6 | 0.2 | 1.9 | 0.2 | 0.4 | 30.4 | 13.3 |
| Tests difficult to interpret (%) | 13.8 | 0.4 | 1.3 | 1.5 | 1.5 | 1.4 | 7.2 | 8.4 |
| Sensitivity (%) | 92.1 | 92.3 | 94.7 | 94.7 | 94.9 | 92.1 | nd | 96.8 |
| 95% CI (sensitivity) | 79.7–97.3 | 79.7–97.3 | 82.7–98.5 | 87.2–98.5 | 83.1–98.6 | 79.2–97.3 | nd | 83.9–100 |
| Specificity (%) | 97.5 | 97.3 | 98.8 | 99.2 | 98.4 | 99.8 | nd | 95.4 |
| 95% CI (specificity) | 95.7–98.6 | 95.5–98.4 | 97.3–99.4 | 97.9–99.7 | 96.8–99.2 | 97.3–99.4 | nd | 93.2–96.8 |
| Positive predictive value (%) | 74.5 | 73.5 | 85.7 | 90.0 | 82.2 | 85.4 | nd | 62.0 |
| Negative predictive value (%) | 99.4 | 99.4 | 99.6 | 99.6 | 99.6 | 99.4 | nd | 99.7 |
| n | 528 | 528 | 528 | 528 | 528 | 528 | 378 | 517 |
CI=confidence interval; nd=not determined.