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Background: The prevalence and antimicrobial resistance of Campylobacter were exammed from swine reared in conventional and ant1m1crobial-free (ABF) production systems m three geographical locations: North Carolina (NC), Ohio (OH) and Wisconsin (WI). Methods: A total of 1500 p1gs and 1930 carcass swab samples were evaluated for the prevalence of Campylobacter. Fecal samples from 662 pigs from NC (370 conventional farms and 292 ABF farms), 379 from OH (268 conventional and 111 ABF) and 459 from WI (160 conventional and 299 ABF) were included. Antimicrobial susceptibility testing was performed using agar dilution method against a panel of six antimicrobials. Results: Campylobacter was commonly found in swine herds 1n all the three states w1th a prevalence of 54.2% (NC), 54.1% {OH) and 58.2% (WI). The prevalence of Campylobacter in conventional farms (56.1 %) was not Significantly different from ABF farms (54.6%) (p > 0 05) However, the prevalence of Campylobacter m WI farms was higher m conventional farms (70 6%) th an ABF (51 .5%) (p 4 mg/L} was h1gher among OH and WI isolates than NC Erythromycin and tetracycline resistance was significantly higher in conventional farms than ABF Farms (p<0.05). Cipronoxacin and Nalidixic acid res1stance was more common 1n ABF farms (p<0.05). The predominant resistance patterns were erythromycin­ tetracycline (Ery-Tet) and tetracycline only (Tel}. Discussion· Th1s study showed h1gh prevalence of Campylobacter among sw1ne herds m the three states with no s1gn1ficant difference by geographical locations and product1on systems (regardless of the antimicrobial use status). The h1gh proport1on of c1pronoxacm res1stant 1solates from ABF herds may have important Implications on the potential role of risk factors other than mere ant1m1crob1al use for production purposes and probably producer compliance.

international conference on the epidemiology and control of biological, chemical and physical hazards in pigs and pork

Prevalence and antimicrobial resistance profile of Campylobacter isolated from conventional and antibiotic free swine farms in three geographic locations