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United States Department of Agriculture

Agricultural Research Service

Title: Antimicrobial Susceptibility of Salmonella Isolates from Swine

Authors
item Holcomb, H - IOWA STATE UNIVERSITY
item Cray, Paula
item Bush, E - USDA-APHIS-CEAH
item Dargatz, D - USDA-APHIS-CEAH
item Tollefson, L - FDA-CVM

Submitted to: International Symposium on Epidemiology and Control of Salmonella in Pork
Publication Type: Abstract Only
Publication Acceptance Date: August 22, 1997
Publication Date: N/A

Technical Abstract: Antimicrobial susceptibility patterns to 19 antimicrobics were determined for Salmonella isolates (n=414) from the NAHMS Swine 95 Study. Isolates are representative of pigs who had no signs of clinical illness. Salmonella derby (n=134) was the most common serotype followed by S. agona (n=54), S. typhimurium (copenhagen) (n=47), S. brandenburg (n=32) and S. mbandaka (n=32). No resistance was observed for amikacin, cefotaxime, ceftiofur, nalidixic acid or ciprofloxacin. Percent of isolates susceptible to the following antimicrobics were 99% for cephalothin, 98% for amoxacillin/clavulanic acid, 97% for gentamicin, 95% for apramycin, 93% for trimethoprim/sulfa, 89% for ticarcillin/clavulanic acid, 86% for piperacillin and neomycin, 85% for ampicillin and ticarcillin, 50% for sulfamethoxasole and 28% for tetracycline. Fifteen isolates (3.6%) were resistant to 2 or more antimicrobics (range 2 to 11). Overall, the high degree of susceptibility suggests that most antimicrobics will retain thei usefulness with the exception of sulfamethoxazole and tetracycline. Resistance to sulfamethoxazole and tetracycline may be the result of subtherapeutic use.

Last Modified: 4/16/2014