Bovine Tuberculosis in Cattle in the Highlands of Cameroon: Seroprevalence Estimates and Rates of Tuberculin Skin Test Reactors at Modified Cut-Offs
Table 1
Distribution of reactors of tuberculin skin tests at various cutoff points and antibovine tuberculosis antibody assay (according to region, sex, age, and herd size) in cattle in Cameroon.
Variable/Label
Number of animals tested
SICCT-BT reactors (%)
SIT-BT reactors
SICCT BT doubtful/SIT-BT positive reactors (%)
SICCT BT doubtful/SIT BT doubtful responses (%)
Excess A* (%)
% of SICCT-BT doubtful and classed positive at inferior cutoff points (%)
Antibovine TB Ab reactors# (%±SE)
T4
T3
T2
XD4
XD3
XD2
Xd4
Xd3
Xd2
XD4 at ≥3 mm
XD4 + XD3 at ≥2 mm
All animals
807
3.59
8.92
11.77
13.14
3.72
0.87
0.50
5.08
2.60
0.12
4.46
2.97
3.84
Agroecological Regions
Adamawa plateaux
363
0.28
0.28
0.55
0.55
0.28
0.28
0.00
0.28
0.28
0.28
0.00
0.00
0.28
Western Highlands
444
6.31
15.99
20.95
23.42
6.53
1.35
0.90
9.01
4.50
0.00
8.11
5.41
6.76
Sex and Age
Female
647
4.02
8.96
11.44
13.14
4.17
1.08
0.62
4.64
2.16
0.15
4.48
3.25
4.33
Male
160
1.88
8.75
13.13
13.13
1.88
0.00
0.00
6.88
4.38
0.00
4.38
1.88
1.88
Young (o 4 years)
481
3.33
8.32
11.02
11.85
3.33
0.42
0.21
4.99
2.49
0.00
3.53
2.91
3.33
Adult (>4 years)
326
3.99
9.82
12.88
15.03
4.29
1.53
0.92
5.21
2.76
0.31
5.83
3.07
4.60
Herd sizes
Animals ≤ 40
169
5.92
10.06
12.43
13.02
6.51
1.18
0.59
2.96
1.78
0.00
4.14
5.92
7.10
Animals > 40
638
2.98
8.62
11.60
13.17
2.98
0.78
0.47
5.64
2.82
0.16
4.55
2.19
2.98
T4, T3, T2, XD4, XD3, XD2, Xd4, Xd3, Xd2, and Excess A are as defined in Figure 2. SICCT-BT: Single Intradermal Comparative Cervical Tuberculin skin test for the detection of bovine tuberculosis. SIT-BT: Single Intradermal Tuberculin skin test for the detection of bovine tuberculosis. Antibovine TB Ab: Antibovine tuberculosis antibody assay. #Breed: Upgraded/Exotic = ; Gudali = ; Namchi = ; Red Bororo = . Management and production system: Extensive = ; Intensive = ; Semi-intensive = ; Beef herds = ; Dairy herds = .
