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Volume 13, Number 11—November 2007


Human Multidrug-Resistant Salmonella Newport Infections, Wisconsin, 2003–2005

Amy E. Karon*1Comments to Author , John R. Archer†, Mark J. Sotir*†1, Timothy A. Monson‡, and James J. Kazmierczak*†
Author affiliations: *University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA; †Wisconsin Division of Public Health, Madison, Wisconsin, USA; ‡Wisconsin State Laboratory of Hygiene, Madison, Wisconsin, USA;

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Table 2

Association between reported demographic and exposure variables and Salmonella Newport-MDRAmpC infections in Wisconsin case-patients, 2003–2005*

Variable† Infection, n (%)
Odds ratio p value
MDRAmpC‡ (n = 137) Pansusceptible (n = 95)
Male 71(52) 30 (32) 2.33 0.002§
Contact with cattle 20 (15) 0 UD 0.0001§
Farm residence or farm or petting zoo visit¶ 14 (10) 0 UD 0.001§
Consumption of raw milk 10 (7) 0 UD 0.006#
Contact with horses 2 (2) 0 UD 0.514#
Foreign travel 0 (0) 1 (1) 0 0.409#
Contact with dead animal 1 (7) 0 UD 1.000#
Contact with pet reptile 0 (0) 7 (7) 0 0.002#

*Salmonella Newport–multidrug-resistant AmpC (MDRAmpC) is resistant to at least chloramphenicol, streptomycin, sulfamethoxazole/sulfisoxazole, tetracycline, amoxicillin-clavulanic acid, ampicillin, cefoxitin, ceftiofur, and cephalothin and shows decreased susceptibility to ceftriaxone. Table includes case-patients with Newport-MDRAmpC and pansusceptible infections only. UD, undefined.
†A specific exposure period was not assessed except for travel. Other exposures reported for case-patients included eating raw ground beef (1 MDRAmpC), eating raw cookie dough (1 MDRAmpC and 1 pansusceptible), preparing a raw chicken pet diet (1 pansusceptible), contact with an ill family member (1 MDRAmpC and 1 pansusceptible), and attending a pig roast (6 MDRAmpC and 1 pansusceptible).
‡At least MDRAmpC resistant.
§Mantel-Haenszel χ2.
¶Exposure to farms and petting zoos was not explicitly assessed by the case reporting form. In all, 14 case-patients reported this exposure; all associated isolates were Newport-MDRAmpC.
#Fisher exact test.

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1Current affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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