Abstract
The main objective of this study was to compare prevalence and antimicrobial resistance of Salmonella isolated from swine reared in antimicrobial-free (ABF) and conventional production systems in North Carolina. Among the two production systems, prevalence was significantly higher among the ABF (15%) than the conventional system (5.2%) (P<0.001). There was no significant difference in the resistance against tetracycline between the two production system at the farm level (P=0.22). The AMP CHL STR SUL TET (R-type ACSSuT) MDR pattern was the most common seen in 73 (10.4%) of the isolates. Among the two production systems, this pentaresistance pattern was observed significantly higher in the ABF (20.6%) than the conventional (2.4%) herds at the farm level (P<0.001). The common finding of highly MDR resistant strains in ABF farms may indicate that specific MDR strains may remain persistent in swine production units regardless of antimicrobial use levels.
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