Research Article

Interpretation Criteria for Comparative Intradermal Tuberculin Test for Diagnosis of Bovine Tuberculosis in Cattle in Maroua Area of Cameroon

Table 1

Performances of single intradermal comparative cervical tuberculin (SICCT) skin test at various cut-off points to diagnose bovine tuberculosis in zebu cattle in Maroua, Cameroon, using detection of tuberculosis lesions and detection of tuberculosis lesions accompanied with acid fast bacilli in lesions to define disease status.

SICCT cut-off pointDetection of tuberculosis lesions to define disease statusDetection of tuberculosis lesions and acid fast bacilli in lesions to define disease status
SensitivitySpecificitySensitivitySpecificity
Value, %
(95% CI)
value []Value, %
(95% CI)
value []Value, %
(95% CI)
value []Value, %
(95% CI)
value []

≥2 mm78.5
(69.7–87.2)
0.001 [10.49]85.9
(78.5–93.2)
0.008 [7.0]1000.000 [30.41] 83.3 
(75.37–91.23)
0.018 [5.56]
≥2.5 mm71.4
(61.8–81.0)
0.034 [4.45]91.2
(85.1–97.2)
0.118 [2.43]94.7
(89.9–99.4)
0.000 [16.69]89.4
(82.85–95.94)
0.250 [1.32]
≥3.0 mm67.8
(57.8–77.7)
0.118 [2.44]94.7
(89.9–99.4)
0.534 [0.38]89.4
(82.8–95.9)
0.004 [8.28]92.4
(86.76–98.03)
0.674 [0.17]
≥3.5 mm67.8
(57.8–77.7)
0.118 [2.44]96.5
(92.6–100)
1 []89.4
(82.8–95.9)
0.004 [8.28]93.9
(88.81–98.98)
1 []
≥4 mm57.1
(46.5–67.6)
/96.5
(92.6–100)
/73.6
(64.2–82.9)
/93.9
(88.81–98.98)
/

Significantly different [] when compared to ≥4 mm cut-off point.