Table 1

Observed IFN-γ test sensitivity and specificity values

Test resultaVL alpacas (n = 55)TB-free alpacas (n = 257)
n/55% sensitivity95% CIn/257% specificity95% CI
PPD+3563.650.9–76.32889.185.3–92.9
EC+2749.135.9–62.32689.986.2–93.6
EC+ PPD814.55.2–23.82191.888.4–95.2
PPD+ EC+1934.622.0–47.2598.196.4–99.8
PPD+ or EC+4480.069.4–90.64980.976.1–85.7
  • a PPD, PPDB − PPDA; EC, ESAT6-CFP10 peptide cocktail.