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Antibacterial Activity of Clove Essential Oil (Syzygium aromaticum) Against Oxacillin-Resistant Staphylococcus
Vanessa Danielle de Freitas1, Edison Lorran Jerdlicka Coelho1, Janaina Marcela Assunção Rosa Moreira1
1Postgraduate Program in Veterinary Sciences, Federal University of Mato Grosso (UFMT), Cuiabá 78060-900, Mato Grosso, Brazil.
Abstract:
Infections caused by oxacillin-resistant Staphylococcus pseudintermedius are increasingly common in veterinary medicine. The indiscriminate use of antibiotics by pet owners worsens this problem, reducing treatment efficacy and creating the need for alternative therapies. This study aimed to evaluate the inhibitory effect of clove essential oil (Syzygium aromaticum) on both oxacillin-resistant and susceptible S. pseudintermedius. Thirty-five isolates from dogs with otitis externa were analyzed. The bacteria were identified by phenotypic tests and tested for susceptibility to 22 antibiotics using disk diffusion. Resistance genes (mecA and blaZ) were detected using conventional PCR. Among the isolates, 34.28% (12/35) were positive for mecA, and 97.14% (34/35) for blaZ. The essential oil's efficacy was assessed using broth microdilution to determine its minimum inhibitory concentration (MIC). Clove oil showed an average MIC and minimum bactericidal concentration (MBC) of 6.4 mg/mL, inhibiting both resistant and susceptible isolates. In conclusion, clove essential oil demonstrated in vitro antimicrobial activity against S. pseudintermedius.
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