Table. Demographic characteristics of febrile patients tested for seropositivity for SFG and STG rickettsioses, Kenya* .

Characteristic	SFG, no. positive/no. tested (%)	OR (95% CI)	STG, no. positive/no. tested (%)	OR (95% CI)
Sex
F	96/1,094 (9)	1.0	43/694 (6)	1.0
M	116/1,131 (10)	1.2 (0.9–1.6)	24/707 (3)	0.5 (0.3–0.9†*
Age, y
<5	41/1,107 (4)	1.0	17/687 (3)	1.0
5–12	62/622 (10)	2.9 (1.9–4.4)†	29/423 (6)	2.9 (1.5–5.7)
13–26	63/290 (22)	7.2 (4.7–11.2)†	10/ 166 (6)	2.5 (1.0–6.0)†
>26	46/206 (22)	7.5 (4.6–12.1)†	11/125 (9)	3.8 (1.6–8.8)†
Animal contact
Goats
No contact	205/2,188 (9)	1.0	60/1,372 (4)	1.0
Contact	7/37 (19)	2.3 (0.8– 5.3)	7/29 (24)	7.0 (2.4–17.7)†
Cows
No contact	207/2,187 (10)	1.0	65/1,377 (5)	1.0
Contact	5/38 (13)	1.4 (0.4−3.8)	2/24 (8)	1.8 (0.2–7.7)
Donkeys
No contact	211/2,223 (10)	1.0	67/1,399 (5)	1.0
Contact	1/2 (50)	9.5 (0.1–748.8)	0/2 (0)	0 (0–38.7)
Cats
No contact	203/2,106 (10)	1.0	66/1,315 (5)	1.0
Contact	9/119 (8)	0.8 (0.3–1.5)	1/86 (1)	0.2 (0.05–1.3)
Sheep
No contact	212/2,218 (10)	1.0	67/1,387 (5)	1.0
Contact	0/7 (0)	0 (0–5.2)	0/14 (0)	0.0 (0–5.5)
Dogs
No contact	210/2,146 (10)	1.0	67/1,398 (5)	1.0
Contact	2/79 (3)	0.2 (0.03–0.9)	0/3 (0)	0.0 (0–11)
Camels
No contact	196/2,173 (9)	1.0	67/1,365 (5)	1.0
Contact	16/52 (31)	4.5 (2.3–8.5)†	0/36 (0)	0.0 (0.0–2.1)

*SFG, spotted fever group; STG, scrub typhus group; OR, odds ratio.
†Seroprevalence for both spotted fever and scrub typhus increased with age; there were significant differences (p<0.05) between those <5 years of age and those in older age groups for SFG and those >12 years of age for STG. Exposure to SFG and STG were more likely in patients who had contact with dogs and camels for SFG and goats for STG (p<0.05). OR, odds ratio.