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Peer-reviewed veterinary case report

Antibiotic resistance and genetic links in dogs and owners bacteria

By Martins, Christina Resende et al.·Published in Frontiers in veterinary science·2025·Department of Veterinary Sciences, Brazil·View original on PubMed

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Original publication title: Genetic connections and antimicrobial resistance in dogs and ownersisolates.

Species:
dog

Plain-English summary

A group of dogs with skin infections (superficial pyoderma) and ear infections (otitis) were found to share antibiotic-resistant bacteria with their owners. About 76% of the dogs had some level of antibiotic resistance, particularly to drugs like oxacillin and cefovecin, which are used to treat infections. The study showed that dogs living with infected humans were more likely to carry these resistant bacteria. This highlights the importance of good hygiene and monitoring for infections in both pets and their owners.

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Abstract

The study's objective was to isolatefrom dogs with superficial pyoderma and/or recurrent otitis, and their guardians, to determine oxacillin, cefovecin, and gentamicin resistance, associated risk factors for infection, and genetic similarity between isolates from dogs and guardians. Prevalence ofin dogs was 76% and in humans was 56%, with concurrent identification in 44%. Oxacillin resistance occurred in 6.38% of dog isolates and 11.36% of isolates from guardians, with relatively strong (disk diffusion test) or moderate (Minimum Inhibitory Concentration) association between phenotypic testing andgene presence. For cefovecin, dog isolates presented resistance in 8.15% disk diffusion and 23.40% broth microdilution. In humans, 6.81 and 36.36% showed cefovecin resistance in disk diffusion and Minimum Inhibitory Concentration tests. Gentamicin resistance in dogs was identified in broth microdilution testing in 2.12%.was identified in 4.39% of isolates with relatively strong association between results of dogs and humans. Dogs sleeping with-positive humans were 6 times more likely to test positive, and dogs attending grooming sessions were 4 times more likely positive for. The whole genome sequencing revealed transmission between dogs and humans in 3 cases. Resistance genes for 8 antibiotic classes were found in chromosomal and plasmid genomes.

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Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/41487482/