Table 2

Increasing the IFN-γ test specificity values

Test resultaVL alpacas (n = 55)TB-free alpacas (n = 257)
n/55% sensitivity95% CIn/257% specificity95% CI
PPD+1629.117.1–41.1896.994.8–99.0
EC+1629.117.1–41.1896.994.8–99.0
EC+ PPD712.73.9–21.5896.994.8–99.0
PPD+ EC+916.46.6–26.10100.098.6–100
PPD+ or EC+2341.828.8–54.81693.890.9–96.7
  • a PPD, PPDB − PPDA; EC, ESAT6-CFP10 peptide cocktail.