Current Microbiology

, Volume 62, Issue 4, pp 1139–1146 | Cite as

Dairy Farm Age and Resistance to Antimicrobial Agents in Escherichia coli Isolated from Dairy Topsoil

  • Suzanna E. Jones
  • Jonathan M. Burgos
  • Marvin M. F. Lutnesky
  • Johnny A. Sena
  • Sanath Kumar
  • Lindsay M. Jones
  • Manuel F. Varela
Article

Abstract

Antimicrobial agent usage is common in animal agriculture for therapeutic and prophylactic purposes. Selective pressure exerted by these antimicrobials on soil bacteria could result in the selection of strains that are resistant due to chromosomal- or plasmid-derived genetic components. Multiple antimicrobial resistances in Escherichia coli and the direct relationship between antimicrobial agent use over time has been extensively studied, yet the relationship between the age of an animal agriculture environment such as a dairy farm and antibiotic resistance remains unclear. Therefore, we tested the hypothesis that antimicrobial-resistance profiles of E. coli isolated from dairy farm topsoil correlate with dairy farm age. E. coli isolated from eleven dairy farms of varying ages within Roosevelt County, NM were used for MIC determinations to chloramphenicol, nalidixic acid, penicillin, tetracycline, ampicillin, amoxicillin/clavulanic acid, gentamicin, trimethoprim/sulfamethoxazole, cefotaxime, and ciprofloxacin. The minimum inhibitory concentration values of four antibiotics ranged 0.75 to >256 μg/ml, 1 to >256 μg/ml, 12 to >256 μg/ml, and 0.75 to >256 μg/ml for chloramphenicol, nalidixic acid, penicillin, and tetracycline, respectively. The study did not show a direct relationship between antibiotic resistance and the age of dairy farms.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Suzanna E. Jones
    • 1
  • Jonathan M. Burgos
    • 1
    • 2
  • Marvin M. F. Lutnesky
    • 1
  • Johnny A. Sena
    • 1
    • 3
  • Sanath Kumar
    • 1
  • Lindsay M. Jones
    • 1
  • Manuel F. Varela
    • 1
  1. 1.Department of BiologyEastern New Mexico UniversityPortalesUSA
  2. 2.Laboratory of Respiratory and Special Pathogens, Division of Bacterial, Parasitic, and Allergenic ProductsCenter for Biologics Evaluation and Research, Food and Drug AdministrationBethesdaUSA
  3. 3.Department of Molecular BiologyUniversity of Colorado Health Sciences, Anschutz Medical CampusAuroraUSA

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