Antimicrobial resistance in Salmonella enterica serovar Dublin isolates from beef and dairy sources |
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Authors: | Davis Margaret A Hancock Dale D Besser Thomas E Daniels Joshua B Baker Katherine N K Call Douglas R |
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Institution: | Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA. madavis@vetmed.wsu.edu |
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Abstract: | Salmonella enterica serovar Dublin (S. Dublin) is a cattle-adapted Salmonella serovar, so if antimicrobial resistance in S. Dublin arises as a result of antimicrobial use this most likely occurs within the cattle reservoir without impact from antimicrobial use in humans. We tested the antimicrobial resistance of bovine-origin S. Dublin isolates from 1986 through 2004 using a standard disk diffusion method. High proportions of isolates throughout the time period were resistant to one or more antimicrobials, and a marked increase in resistance to ceftazidime occurred between 2000 and 2004. Dairy-origin isolates were more likely to be resistant to several antibiotics than were isolates from beef operations where exposure to antimicrobials is likely to be less frequent. Plasmid analysis of a subset of isolates also supported the hypothesis that antimicrobial resistance traits in the cattle-adapted serovar Dublin were acquired within the bovine host environment. |
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