High frequency transfer and horizontal spread of apramycin resistance in calf faecal Escherichia coli

The Journal of Antimicrobial Chemotherapy
C M YatesS G B Amyes

Abstract

The aminoglycoside apramycin has been used extensively in animal husbandry in the UK since 1978. This study aimed to determine both whether calves that had never been treated with aminoglycoside antibiotics harboured apramycin-resistant (apr(R)) commensal Escherichia coli, and the mode of spread of the resistance gene. Apr(R) E. coli from weekly calf faecal samples were typed by pulsed-field gel electrophoresis, antibiotic resistance phenotype, plasmid restriction profiles and plasmid transfer frequencies. During 4 months of weekly sampling, six of 11 calves were found to harbour apr(R) E. coli. All apr(R) E. coli (45) were cross-resistant to gentamicin and tobramycin, which are both used in human medicine. Resistance was conferred by the aac(3)IV gene, present on three different conjugative plasmids. Two of these plasmids also mediated tetracycline and streptomycin resistance. One plasmid demonstrated very high transfer frequencies and was found in three different genotypes. We report the presence of apr(R) commensal E. coli in cattle that have never been treated with aminoglycosides. The presence of one conjugative plasmid in three different genotypes is evidence of horizontal spread of this plasmid. This is the first report ...Continue Reading

Citations

Jan 4, 2007·Foodborne Pathogens and Disease·Xiuping JiangMichael P Doyle
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Oct 24, 2007·Applied and Environmental Microbiology·Thi Thu Hao VanPeter J Coloe
Nov 5, 2005·Applied and Environmental Microbiology·Deborah V HoyleSebastian G B Amyes
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Aug 28, 2020·BMC Veterinary Research·Yuqi YangXiuying Zhang

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