Antimicrobial resistance of fecal coliforms from pigs in a herd not exposed to antimicrobial agents for 126 months

Bruce E. Langlois, Karl A. Dawson, Irene Leak, Debra K. Aaron

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Patterns of antimicrobial resistance were determined for lactose-fermenting fecal coliforms obtained during a 20-month period from pigs in a herd without exposure to antimicrobial drugs for 126 months. Mean percent resistance to cephalothin, chloramphenicol, kanamycin, naladixic acid, streptomycin and tetracycline was lower (P < 0.01) for isolates obtained during the 20-month period (Group 2) than for isolates obtained during the first 13 months (Group 1) after the withdrawal of antibiotics. Mean tetracycline resistance was 40.5% for Group 2 isolates. Approximately 44% of the Group 2 isolates were resistant to the 10 antimicrobial agents compared with 74.9% for the Group 1 isolates (P < 0.01). Multiple resistance was lower (P < 0.01) in the Group 2 isolates than in the Group 1 isolates. Four resistance patterns (tetracycline, tetracycline-streptomycin, tetracycline-sulfisoxazole, tetracycline-streptomycin-sulfisoxazole) accounted for 74% of the resistant isolates.

Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalVeterinary Microbiology
Volume18
Issue number2
DOIs
StatePublished - Oct 1988

ASJC Scopus subject areas

  • Microbiology
  • General Veterinary

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