Diversity and distribution of commensal fecal Escherichia coli bacteria in beef cattle administered selected subtherapeutic antimicrobials in a feedlot setting.

Applied and Environmental Microbiology
Ranjana SharmaTim A McAllister

Abstract

Escherichia coli strains isolated from fecal samples were screened to examine changes in phenotypic and genotypic characteristics including antimicrobial susceptibility, clonal type, and carriage of resistance determinants. The goal of this 197-day study was to investigate the influence of administration of chlortetracycline alone (T) or in combination with sulfamethazine (TS) on the development of resistance, dissemination of defined strain types, and prevalence of resistance determinants in feedlot cattle. Inherent tetracycline resistance was detected in cattle with no prior antimicrobial exposure. Antimicrobial administration was not found to be essential for the maintenance of inherently ampicillin-resistant and tetracycline-resistant (Tet(r)) E. coli in control animals; however, higher Tet(r) E. coli shedding was observed in animals subjected to the two treatments. At day 0, high tetracycline (26.7%), lower sulfamethoxazole-tetracycline (19.2%), and several other resistances were detected, which by the finishing phase (day 197) were restricted to ampicillin-tetracycline (47.5%), tetracycline (31.7%), and ampicillin-tetracycline-sulfamethoxazole (20.8%) from both treated and untreated cattle. Among the determinants, bla(TEM...Continue Reading

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Citations

Aug 1, 2009·Foodborne Pathogens and Disease·Ranjana SharmaKaren A Beauchemin
Oct 7, 2011·Clinical Microbiology Reviews·Bonnie M Marshall, Stuart B Levy
Mar 13, 2012·International Journal of Environmental Research and Public Health·A Mark IbekweAlexandria K Graves
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Jul 28, 2012·Journal of the Science of Food and Agriculture·Sónia RamosPatrícia Poeta
Jan 18, 2014·Preventive Veterinary Medicine·E BurowA Käsbohrer
Oct 30, 2014·Frontiers in Public Health·Leon Cantas, Kaya Suer
Jan 24, 2019·Foodborne Pathogens and Disease·Serajus SalaheenJo Ann S Van Kessel
Feb 23, 2019·Frontiers in Microbiology·Sarah MarklandKwangCheol Casey Jeong

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