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 point
Detection of tuberculosis lesions to define disease status
Detection of tuberculosis lesions and acid fast bacilli in lesions to define disease status
Sensitivity
Specificity
Sensitivity
Specificity
Value, % (95% CI)
value []
Value, % (95% CI)
value []
Value, % (95% CI)
value []
Value, % (95% CI)
value []
≥2 mm
78.5 (69.7–87.2)
0.001 [10.49]
85.9 (78.5–93.2)
0.008 [7.0]
100
0.000 [30.41]
83.3 (75.37–91.23)
0.018 [5.56]
≥2.5 mm
71.4 (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 mm
67.8 (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 mm
67.8 (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 mm
57.1 (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.