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Antimicrobial activity of organic acids against canine skin bacteria

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Abstract

Canine skin is often a source of bacterial strains that are characterized by the presence of important virulence factors and a high antimicrobial resistance. These bacteria are involved in the pathogenesis of infectious skin diseases, which are very frequent in dogs. Moreover, canine skin isolates are easily spread to other animals and humans. The aim of this study was to evaluate the inhibitory and bactericidal activity of eight organic acids (L-lactic, acetic, propionic, butyric, citric, succinic, glycolic, L-ascorbic acid) against 14 canine skin isolates (11 Gram-positive and three Gram-negative species). The advantages of the tested organic acids are their gentleness to the skin and their affordability. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined by the broth microdilution method. All tested acids showed a bactericidal effect against the selected bacteria, with the exception of their bacteriostatic effect against the Bacillus cereus strain. The lowest MIC showed acetic acid (MIC between 0.5 and 2.0 mg/mL) and propionic acid (MIC 0.8 – 3.3 mg/mL), whereas L-ascorbic acid (MIC 4.0 – 16.0 mg/mL) seems to be weaker among the tested acids. Two Staphylococcus aureus strains and a strain of Escherichia coli were observed to be more resistant compared to coagulase-negative staphylococci.

Highlights

  • The canine skin is common source of multiresistant and biofilm-forming bacteria

  • Organic acids could represent alternative antimicrobial means for skin

  • Acetic and propionic acids were showed lowest MIC among tested acids

  • The higher minimal inhibitory concentrations were observed for S. aureus and E. coli

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All data generated or analysed during this study are included in this published article.

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Acknowledgements

This work was financed by the Slovak scientific agency VEGA (Vedecká grantová agentúra Ministerstva školstva, vedy, výskumu a športu Slovenskej republiky a Slovenskej akadémie vied; project no. 2/0006/20 and no. VEGA 2/0010/21).

Funding

This work was financed by the Slovak scientific agency VEGA (Vedecká grantová agentúra Ministerstva školstva, vedy, výskumu a športu Slovenskej republiky a Slovenskej akadémie vied; project no. 2/0006/20 and no. VEGA 2/0010/21).

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Contributions

Viola Strompfová conceived the study design. Lucia Štempelová, Viola Strompfová, Dobroslava Bujňáková and Ivana Kubašová performed the analysis of the MIC and testing of bacterial properties. Lívia Karahutová detected the virulence factors of the strains by the PCR method. Canine skin samples provided Jana Gálová and Erik Kužma. The first draft of the manuscript was written by Lucia Štempelová, and all the authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.

Corresponding author

Correspondence to Viola Strompfová.

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All procedures involving dogs were in accordance with standard veterinary practices according Slovak legislation (no. 377/2012 and 436/2012).

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The authors declare no conflict of interest.

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Štempelová, L., Kubašová, I., Bujňáková, D. et al. Antimicrobial activity of organic acids against canine skin bacteria. Vet Res Commun 47, 999–1005 (2023). https://doi.org/10.1007/s11259-022-10056-z

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  • DOI: https://doi.org/10.1007/s11259-022-10056-z

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