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Malassezia pachydermatis, an important opportunistic secondary pathogen, is often associated with atopic dermatitis or otitis externa in dogs. Recent studies indicate an increase in resistance of this yeast to commonly used antifungal agents. Therefore, the search for new antifungal agents is a challenge. In the present study, the susceptibility of M. pachydermatis strains to 10 plant essential oils—EOs (bergamot, grapefruit, coriander, hyssop, lavender, tea tree, nutmeg, oregano, rosemary, and Spanish sage) was determined using the broth microdilution method. All 15 clinical strains tested were susceptible to coriander (100%). A good antifungal activity was shown for EO from nutmeg (93.33%), bergamot (86.66), Spanish sage and hyssop (73.33%) and rosemary (66.67%). Lower antifungal efficacy was identified in EOs from grapefruit, lavender, tea tree and oregano (53.33%). The obtained results indicate promising prospects for the clinical use of essential oils in the treatment of M. pachydermatis infections.
Čonková et al. (Mon,) studied this question.