Table 4.
Bayesian estimates of sensitivity and specificity for each test, and disease prevalence (%)
| Parameter | Test | Median | 95% PPIa |
|---|---|---|---|
| Sensitivity | SIT (severe)b | 87.6 | 75.3–95.2 |
| IFN-γ c | 55.7 | 38.6–74.4 | |
| ELISAd | 47.4 | 30.0–71.2 | |
| Specificity | SIT (severe)b | 83.6 | 74.2–92.8 |
| IFN-γ c | 93.5 | 87.0–98.1 | |
| ELISAd | 90.9 | 84.5–95.5 | |
| Disease prevalence | 22.2 | 11.9–33.6 | |
| Covariance of infected cattle | −1.2 | −7.3-6.0 | |
| Covariance of uninfected cattle | 3.4 | 0.0–8.0 |
a 95% PPI = 95% posterior probability interval
b single intradermal tuberculin test using severe interpretation
c interferon gamma assay
d a commercial antibody detection test (M. bovis Ab ELISA)