Table 3.

Association of breed, gender, age and ticks infestation with the frequency of Anaplasma phagocytophilum obtained through of the indirect fluorescent antibody (IFA) testing in horses in Rio de Janeiro, Brazil.

Variables related to the horses	IFA Anaplasma phagocytophilum
	N	Positives (%)	P value	OR	CI (95%)
Gender
Female	44	15.9	0.88	0.92	0.31–2.77
Male	54	14.8
Breed
Defined breed	59	11.9	0.24	1.92	0.63–5.80
Mixed breed	39	20.5
Age (years)
< 1	12	0.0	0.22	–	–
1 ≤ 5	17	11.8
> 5	69	18.8
Ticks infestation
Absence	18	11.1	0.58	1.55	0.32-7.58
Presence	80	16.3

N = number of horses sampled, OR = Odds Ratio, CI = Confidence Interval.