Rural Residents in China Are at Increased Risk of Exposure to Tick-Borne Pathogens Anaplasma phagocytophilum and Ehrlichia chaffeensis

Table 4

Analysis of the presumed risk of E. chaffeensis and A. phagocytophilum among rural residents.

Variables	E. chaffeensis						A. phagocytophilum
	Number (%) of residents						Number (%) of residents
	Total cohort; 𝑁=7322	IFA positive; 𝑁=719	IFA negative; 𝑁=6603	OR	95% CI	𝑃 value	Total cohort; 𝑁=7321	IFA positive; 𝑁=1331	IFA negative; 𝑁=5990	OR	95% CI	𝑃 value
Living in plains areas	5271 (72.0)	506 (70.4)	4765 (72.2)	0.92	0.8–1.1	0.3	5271 (72.0)	945 (71.0)	4326 (72.2)	0.96	0.8–1.1	0.6
Living in hilly areas	2051 (28.0)	213 (29.6)	1545 (27.8)				2050 (28.0)	386 (29.0)	1664 (27.8)
Planting crops	4174 (57.0)	396 (55.1)	3778 (57.2)	0.95^a	0.8–1.1^a	0.6^a	4173 (57.0)	720 (54.1)	3452 (57.6)	0.8^a	0.7–0.9^a	0.006^a
Planting fruit trees	1684 (23.0)	168 (23.4)	1516 (23.0)	0.90^b	0.7–1.1^b	0.2^b	1683 (23.0)	342 (25.7)	1340 (22.4)	0.9^b	0.8–1.1^b	0.4^b
Nonplanting	1464 (20.0)	155 (21.6)	1309 (19.8)	0.94^c	0.7–1.2^c	0.6^c	1464 (20.0)	266 (20.0)	1198 (20.0)	1.1^c	1.0–1.4^c	0.1^c
Contact with farm animals	6956 (95.0)	682 (94.8)	6274 (95.0)	0.97	0.71–1.4	0.9	6955 (95.0)	1311 (98.5)	5644 (94.2)	4.0	2.6–6.3	<0.0001
Tick bite in last 24 months	879 (12.0)	90 (12.5)	789 (11.9)	1.1	0.8–1.3	0.7	879 (12.0)	172 (12.9)	707 (11.8)	1.1	0.9–1.3	0.3
Fever in last 24 months	439 (6.0)	46 (6.4)	393 (6.0)	0.006	0.004–0.008	<0.0001	439 (6.0)	85 (6.4)	354 (5.9)	0.04	0.03–0.04	<0.0001
Working time >3 hours per day	5415 (74.0)	535 (74.4)	4882 (74.0)	1.0	0.9–1.2	0.8	5414 (74.0)	985 (74.0)	4429 (73.9)	1.0	0.9–1.2	1.0
Service time >2 years	5418 (74.0)	560 (77.9)	4858 (73.6)	1.3	1.1–1.5	0.01	5417 (74.0)	1095 (82.3)	4321 (72.1)	1.8	1.5–2.1	<0.0001

aPlanting crops versus planting fruit trees.
bPlanting crops versus nonplanting.
cPlanting fruit trees versus nonplanting.