Lesion Distribution and Epidemiology of Mycobacterium bovis in Elk and White-Tailed Deer in South-Western Manitoba, Canada
Table 5
Prevalence of M. bovis in elk and white-tailed deer (WTD) stratified by sex, age category, and surveillance method from south-western Manitoba.
Culture −
Culture +
Prevalencea(%)
Odds Ratio
χ 2
P
Species
Age (Years)
<1b
449
1
0.22
1
1 to 2
814
6
0.73
3.31 (0.40–152.6)
1.375
.241
3–5
1821
11
0.60
2.71 (0.39–117.0)
0.987
.320
6–8
508
12
2.31
10.61 (1.56–454)
7.93
.005
>8
417
11
2.57
11.84 (1.7–510.9)
8.96
.003
Elk
Sex
Femaleb
2683
19
0.70
1
Male
1859
22
1.17
1.67 (0.86–3.27)
2.72
.099
Surveillance Method
Huntedb
3345
9
0.27
1
Opportunistic
179
3
1.65
6.23 (1.07–25.2)
9.72
.002
Culled
73
2
2.67
10.2 (1.05–50.3)
13.2
<.001
Blood Test
945
27
2.78
10.6 (4.82–25.7)
57.5
<.001
Age (Years)
<1
457
0
0.00
ND
ND
ND
1–2b
2017
2
0.10
1
3–5
4476
3
0.07
0.68 (0.08–8.10)
0.186
.666
6–8
220
6
2.65
27.5 (4.9–279.3)
37.4
<0.001
>8
25
0
0.00
ND
ND
ND
Sex
WTD
Female
1976
1
0.05
1
Male
5392
10
0.19
3.66 (0.52–159.1)
1.76
.185
Surveillance Method
Hunted
6735
6
0.09
1
Opportunistic
195
0
0.00
0 (0–29.5)
0.17
.677
Culled
273
3
1.09
12.34 (1.98–58.1)
20.61
<.001
Blood Test
165
2
1.20
13.61 (1.33–76.7)
17.31
.001
aStratum specific prevalence (number positive/total number tested per category).
bCategory used as the reference category for odds ratio and chi-square calculations.