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 +	Prevalence^a(%)	Odds Ratio	χ ^2	P
Species	Age (Years)
	<1^b	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
	Female^b	2683	19	0.70	1
	Male	1859	22	1.17	1.67 (0.86–3.27)	2.72	.099
	Surveillance Method
	Hunted^b	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
	1–2^b	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.