Brucellosis in Camels and Humans: Seroprevalence and Associated Risk Factors in Amibara District of Afar Region, Ethiopia

Table 2

Summary of Brucella seropositivity in camels and association of potential risk factors.

Variables	Number tested	Seropositive	Prevalence (%)	χ^2	value
Sex				0.309^a	1
Male	9	0	0
Female	241	8	3.43
Age				10.7^b	≤0.004
Young	34	0	0
Adult	165	2	1.21
Old	51	6	11.764
Body condition				10.26^b	≤0.003
Poor	53	6	11.3
Medium	158	2	1.266
Good	39	0	0
Herd size				0.926^b	0.6357
<20	42	2	4.76
20–50	92	2	2.17
>50	116	4	3.45
Number of parity				11.2^b	≤0.001
Null	32	0	0
Less than or = 3	160	2	1.25
Greater than 3	49	6	12.24
Abortion history				29.96^a	≤0.005
Aborted	37	7	18.92
No abortion	213	1	0.47
Placental retention				0.134^b	1
Yes	4	0	0
No	229	8	3.5

^bFisher’s exact test value; ^a chi-square value; significant; only female animals considered.