<xhtml:span xmlns:xhtml="http://www.w3.org/1999/xhtml" xml:lang="en">Antibacterial activity of&#160;Cinnamomum verum&#160;and Thymus vulgaris&#160;essential oils on multidrug-resistant zoonotic bacteria isolated from dogs in southern Benin </xhtml:span>

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Abstract

Objective Antibiotic resistance is a major public health problem. The search for new therapeutic alternatives is becoming urgent. Essential oils are a promising alternative. This study aimed to evaluate the antibacterial activities of essential oils from selected plants on multidrug-resistant zoonotic strains isolated from dogs. Methods Essential oils from dried Thymus vulgaris leaves, Cinnamomum verum bark, and Cuminum cyminum seeds were extracted and tested on five multidrug-resistant Escherichia coli and four S. aureus isolated from dogs in southern Benin. Results The study showed that Thymus vulgaris essential oil was bacteriostatic, with a Minimum Inhibitory Concentration (MIC) equal to 2.5 μl/ml and a Minimum Bactericidal Concentration (MBC) of 17 μl/ml for E. coli strains and 11.25 μl/ml for S. aureus strains. Regarding Cinnamomum verum essential oil, its bacteriostatic power was characterized by an MIC of 1.25 μl/ml for the isolates tested and an average MBC of 11.50 μl/ml for E. coli and 12.19 μl/ml for S. aureus. On the other hand, Cuminum cyminum essential oil was ineffective on the strains investigated. Additionally, T. vulgaris essential oil contained predominantly thymol (36.57%), p-cymene (30.51%), and carvacrol (7.62%), while C. verum essential oil contained cinnamaldehyde (88.76%). Conclusion This study reveals the antibacterial activity of T. vulgaris dry leaf and C. verum bark essential oils on multi-resistant E. coli and S. aureus isolated from dogs. These two essential oils may be alternative candidates for combating antibiotic-resistant E. coli and S. aureus infections.

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