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Research Article


Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results

Andrea Núñez, Rodrigo Castro, Pamela Thomson.


Abstract
Background:
The microbiota of the external ear of cats comprises different types of bacteria that can change due to intrinsic or extrinsic factors. Coagulase-negative Staphylococcus (CoNS) is predominant in the external ear of cats. Antibiotic-resistant CoNS associated with infectious pathologies has been reported in humans. The presence of antibiotic-resistant CoNS acting as reservoirs in the ears of healthy cats could represent a zoonotic risk. This has not yet been studied in Talca, Chile.

Aim:
This study aimed to determine the antimicrobial susceptibility of CoNS strains obtained from the external ear of healthy cats in Talca, Chile, as a possible zoonotic risk.

Methods:
Ear swabs were obtained from 31 healthy cats. Bacterial culture and morphological analysis were performed on the samples. MALDI-TOF was used to identify CoNS strains, which were tested against a panel of 11 antibiotics using the Kirby-Bauer disk diffusion method. Fisher’s exact test was used to determine the association between the epidemiological variables of the patients and the antimicrobial susceptibility of CoNS strains.

Results:
Nine CoNS strains were isolated from the ear of seven healthy cats (prevalence 22.58%). Staphylococcus simulans and Staphylococcus felis were the main species identified. Antimicrobial resistance was observed in 55.5% of the strains, mainly to oxacillin. Resistance to more than two antibiotics was observed in 22.2% of the strains. No association was found between the epidemiological variables of the patients and the antimicrobial susceptibility of the CoNS strains.

Conclusion:
The ears of healthy cats can act as a reservoir for antibiotic-resistant CoNS, with a potential risk of transmission to humans. These preliminary results are the first to be reported in Talca, Chile.

Key words: Staphylococcus; Healthy cat; Ear; Antimicrobial resistance.


 
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How to Cite this Article
Pubmed Style

Núñez A, Castro R, Thomson P. Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. Open Vet. J.. 2025; 15(9): 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11

Web Style

Núñez A, Castro R, Thomson P. Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. https://www.openveterinaryjournal.com/?mno=258568 [Access: October 06, 2025]. doi:10.5455/OVJ.2025.v15.i9.11

AMA (American Medical Association) Style

Núñez A, Castro R, Thomson P. Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. Open Vet. J.. 2025; 15(9): 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11


Vancouver/ICMJE Style

Núñez A, Castro R, Thomson P. Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. Open Vet. J.. (2025), [cited October 06, 2025]; 15(9): 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11


Harvard Style

Núñez, A., Castro, . R. & Thomson, . P. (2025) Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. Open Vet. J., 15 (9), 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11


Turabian Style

Núñez, Andrea, Rodrigo Castro, and Pamela Thomson. 2025. Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. Open Veterinary Journal, 15 (9), 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11


Chicago Style

Núñez, Andrea, Rodrigo Castro, and Pamela Thomson. "Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results." Open Veterinary Journal 15 (2025), 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11


MLA (The Modern Language Association) Style

Núñez, Andrea, Rodrigo Castro, and Pamela Thomson. "Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results." Open Veterinary Journal 15.9 (2025), 4075-4081. Print. doi:10.5455/OVJ.2025.v15.i9.11


APA (American Psychological Association) Style

Núñez, A., Castro, . R. & Thomson, . P. (2025) Antimicrobial resistance of coagulase-negative Staphylococcus isolated from the external ear canal of healthy cats in Talca, Chile, South América: Preliminary results. Open Veterinary Journal, 15 (9), 4075-4081. doi:10.5455/OVJ.2025.v15.i9.11


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