Table 3.
Bayesian estimates of sensitivity and specificity for each test, and disease prevalence (%)
| Parameter | Test | Median | 95% PPIa |
|---|---|---|---|
| Sensitivity | SIT (standard)b | 62.4 | 43.2–80.2 |
| IFN-γ c | 60.1 | 39.8–81.3 | |
| ELISAd | 52.5 | 30.8–77.7 | |
| Specificity | SIT (standard)b | 90.6 | 82.9–97.6 |
| IFN-γ c | 89.0 | 81.6–95.4 | |
| ELISAd | 88.3 | 81.8–93.3 | |
| Disease prevalence | 14.1 | 6.7–23.4 | |
| Covariance of infected cattle | −9.9 | −22.3-2.9 | |
| Covariance of uninfected cattle | 2.6 | −0.3-6.7 |
a 95% PPI = 95% posterior probability interval
b single intradermal tuberculin test using standard interpretation
c interferon gamma assay
d a commercial antibody detection test (M. bovis Ab ELISA)