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Volume 11, Number 10—October 2005

Dispatch

Drug-resistant Escherichia coli, Rural Idaho

Elizabeth L. Hannah*Comments to Author , Frederick J. Angulo†, James R. Johnson‡§, Bassam Haddadin*, Jacquelyn Williamson*, and Matthew H. Samore*¶
Author affiliations: *University of Utah School of Medicine, Salt Lake City, Utah, USA; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA; ‡Veterans Administration Medical Center, Minneapolis, Minnesota, USA; §University of Minnesota, Minneapolis, Minnesota, USA; ¶Veterans Administration Salt Lake City Health Care System, Salt Lake City, Utah, USA

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Table 2

Comparison of 517 study participants with and without carriage of antimicrobial drug-resistant Escherichia coli, by questionnaire responses and pharmacy data*

Characteristic Noncarriers (n = 452), no. (%) TMP/SMZ resistant (n = 49)
NA resistant (n = 16)
No. (%) OR (95% CI) No. (%) OR (95% CI)
Demographic variables
Male 228 (50) 24 (49) 1.0 (0.6–1.8) 9 (56) 1.1 (0.5–2.4)
Income <$35,000/y 69 (13) 10 (20) 1.9 (0.8–4.7) 1 (6) 0.8 (0.1–6.7)
High school education or less 149 (33) 18 (37) 1.3 (0.6–2.9) 3 (19) 0.4 (0.1–2.2)
Hispanic ethnicity 24 (5) 6 (12) 2.6 (0.7– 9.3) 0 (0)
Age, y
<6 144 (32) 16 (33) Ref 3 (19) Ref
7–17 71 (16) 5 (10) 1.3 (0.6–2.8) 2 (13) 1.5 (0.7–3.0)
18–50 189 (42) 22 (45) 0.8 (0.4–1.5) 6 (38) 1.3 (0.4–3.7)
>50 48 (11) 6 (12) 0.9 (0.3–2.6) 5 (31) 1.9 (0.3–13.6)
Travel/daycare factors
Child in daycare/preschool 79 (18) 9 (18) 1.0 (0.5–2.2) 0 (0)
Traveled out of United States 17 (4) 1 (2) 0.4 (0.1–1.7) 4 (25) 6.0 (0.9–39.9)
Dietary factors
Ate hamburger, times/week
1–2 219 (49) 23 (47) 0.6 (0.3–1.2) 10 (63) 0.7 (0.2–2.0)
>2 164 (37) 14 (29) 0.6 (0.2–1.3) 4 (25) 0.5 (0.2–1.3)
Ate chicken, times/week
1–2 254 (56) 23 (47) 0.6 (0.3–1.2) 8 (50) 0.8 0.2–2.6
>2 127 (28) 14 (29) 0.6 (0.3–1.5) 7 (44) 1.3 (0.4–4.1)
Household cook 177 (39) 21 (44) 1.0 (0.6–1.7) 7 (44) 0.8 (0.4–1.4)
Primary grocery shopper 169 (37) 20 (41) 1.0 (0.6–1.6) 8 (50) 1.1 (0.6–1.9)
Healthcare/antimicrobial drug use
Ambulatory visit in past 6 mo 236 (52) 22 (45) 0.8 (0.4–1.3) 9 (56) 1.1 (0.5–2.3)
Diabetic 9 (2) 3 (6) 2.9 (0.7–11.7) 1 (6) 1.5 (0.0–117.4)
Hospitalized in past 6 mo 27 (6) 3 (6) 1.0 (0.3–2.5) 4 (25) 3.4 (0.5–22.4)
Antimicrobial drug use in past 30 d 209 (46) 22 (45) 0.7 (0.2–2.7) 13 (81) 2.6 (0.7–9.7)
Animal exposure in past month
Livestock 32 (7) 2 (4) 0.5 (0.1–2.1) 1 (6) 1.6 (0.5–4.9)
Cattle 19 (4) 2 (4) 0.8 (0.2–3.4) 0 (0)
Horses 18 (4) 1 (2) 0.5 (0.1–4.4) 1 (6) 2.3 (0.7–9.6)
Household size†
<3 43 (34) 10 (29) Ref 3 (33) Ref
3–4 48 (38) 11 (31) 0.7 (0.3–1.6) 3 (33) 1.1 (0.2–5.5)
>4 35 (28) 14 (40) 0.4 (0.2–1.1) 3 (33) 0.4 (0.1–3.4)
Household antimicrobial drug use in past 30 d 21 (17) 5 (14) 0.6 (0.2–1.9) 4 (44) 8.4 (2.4–29.2)

*TMP/SMZ, trimethoprim/sulfamethoxazole; NA, nalidixic acid; OR, odds ratio; CI, confidence interval; Ref, referent.
†n = 126 for noncarriers; n = 35 for TMP/SMZ resistant; n = 9 for NA resistant.

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