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Article

Escherichia coli Antibiotic Resistance Patterns from Co-Grazing and Non-Co-Grazing Livestock and Wildlife Species from Two Farms in the Western Cape, South Africa

1
Centre for Food Safety, Department of Food Science, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
2
Department of Animal Sciences, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
3
Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Digital Agricultural Building, 8115, Office 110, Gatton 4343, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Antony T. Vincent
Antibiotics 2021, 10(6), 618; https://doi.org/10.3390/antibiotics10060618
Received: 21 April 2021 / Revised: 14 May 2021 / Accepted: 17 May 2021 / Published: 22 May 2021
Although limited, studies have found conflicting results on whether co-grazing results in significant antibiotic resistance transfer between species. This type of farming system can act as a vector in the geographical spread of antibiotic-resistant bacteria in the environment. The aim of this study was to determine the antibiotic-resistant patterns between co-grazing and non-co-grazing livestock and wildlife species in South Africa. Escherichia coli was isolated from the faeces of various wildlife and livestock species from two farms in South Africa and was tested for antibiotic resistance using the Kirby–Bauer disk diffusion method against chloramphenicol, nalidixic acid, ampicillin, streptomycin, sulphafurazole, and tetracycline. A selection of some common antibiotic-resistant genes (blaCMY, aadA1, sul1, sul2, tetA, and tetB) were detected using PCR. The E. coli isolates from wildlife and livestock that co-grazed showed no significant differences in antibiotic resistance patterns. However, this was not the case for tetracycline resistance as the livestock isolates were significantly more resistant than the co-grazing wildlife isolates. The E. coli isolates from the non-co-grazing livestock and wildlife had significant differences in their antibiotic susceptibility patterns; the wildlife E. coli isolates were significantly more resistant to sulphafurazole and streptomycin than the livestock isolates, whilst those isolated from the cattle were significantly more resistant to ampicillin than the wildlife and sheep isolates. The results of this study suggest that there could be an exchange of antibiotic-resistant bacteria and genes between livestock and wildlife that co-graze. View Full-Text
Keywords: antimicrobial resistance; disc diffusion; game; ungulate; wildlife; livestock; cattle; sheep antimicrobial resistance; disc diffusion; game; ungulate; wildlife; livestock; cattle; sheep
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MDPI and ACS Style

van den Honert, M.S.; Gouws, P.A.; Hoffman, L.C. Escherichia coli Antibiotic Resistance Patterns from Co-Grazing and Non-Co-Grazing Livestock and Wildlife Species from Two Farms in the Western Cape, South Africa. Antibiotics 2021, 10, 618. https://doi.org/10.3390/antibiotics10060618

AMA Style

van den Honert MS, Gouws PA, Hoffman LC. Escherichia coli Antibiotic Resistance Patterns from Co-Grazing and Non-Co-Grazing Livestock and Wildlife Species from Two Farms in the Western Cape, South Africa. Antibiotics. 2021; 10(6):618. https://doi.org/10.3390/antibiotics10060618

Chicago/Turabian Style

van den Honert, Michaela S., Pieter A. Gouws, and Louwrens C. Hoffman 2021. "Escherichia coli Antibiotic Resistance Patterns from Co-Grazing and Non-Co-Grazing Livestock and Wildlife Species from Two Farms in the Western Cape, South Africa" Antibiotics 10, no. 6: 618. https://doi.org/10.3390/antibiotics10060618

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