Use of a nonmedicated dietary supplement correlates with increased prevalence of streptomycin-sulfa-tetracycline-resistant Escherichia coli on a dairy farm

Applied and Environmental Microbiology
Artashes R KhachatryanDouglas R Call

Abstract

We examined how a dietary supplement affects the prevalence of antibiotic-resistant Escherichia coli on a dairy farm in Washington State. Between 2001 and 2004 the prevalence of fecal E. coli strains resistant to streptomycin, sulfadiazine, and tetracycline (SSuT strains) declined from 59.2% to 26.1% in the calf population. In 2003 the dairy discontinued use of a dietary supplement, and we hypothesized that the decline in prevalence of SSuT strains was related to this change in management. To test this we established three treatments in which calves received no supplement, the dietary supplement with oxytetracycline, or the dietary supplement without oxytetracycline. Calves receiving either dietary supplement had a significantly higher prevalence of SSuT E. coli than the no-supplement control group (approximately 37% versus 20%, respectively; P = 0.03). Importantly, there was no evidence that oxytetracycline contributed to an increased prevalence of fecal SSuT E. coli. We compared the growth characteristics of SSuT and non-SSuT E. coli in LB broth enriched with either the complete dietary supplement or its individual constituents. Both the complete dietary supplement and its vitamin D component supported a significantly higher ...Continue Reading

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Citations

Aug 1, 2009·Foodborne Pathogens and Disease·Ranjana SharmaKaren A Beauchemin
Sep 30, 2008·Applied and Environmental Microbiology·Randall S SingerRichard L Wallace
Oct 7, 2011·Clinical Microbiology Reviews·Bonnie M Marshall, Stuart B Levy
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Aug 27, 2011·The Journal of Veterinary Medical Science·Masaru SugawaraMasato Akiba
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Nov 11, 2018·Applied and Environmental Microbiology·Elizabeth A MillerKimberly VanderWaal
Feb 6, 2019·Journal of Medical Microbiology·Jonas Fernandes MacielAgueda Castagna de Vargas
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Sep 29, 2019·Nature Communications·Jinxin LiuDavid A Mills
Dec 31, 2009·Nature Reviews. Microbiology·Cristina LanzasYrjö T Gröhn

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