Journal
MEDICAL MYCOLOGY
Volume 50, Issue 1, Pages 33-42Publisher
OXFORD UNIV PRESS
DOI: 10.3109/13693786.2011.582890
Keywords
Candida albicans; drug resistance; essential oils; synergy; fluconazole; amphotericin B
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Funding
- Indian Council of Medical Research, New Delhi
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Therapy for candidiasis is becoming problematic due to the toxicities of currently available antifungal agents and the increasing prevalence of resistance among the etiologic agents. Therefore, new antifungals and alternative approaches are needed. In this study, 20 fluconazole-resistant strains of Candida albicans were found to have varying levels of resistance to other azoles, i.e., itraconazole (MIC of 4-128 mu g/ml) and ketoconazole (2-256 mu g/ml). In addition, 13 of these isolates appeared resistant to amphotericin B (32-128 mu g/ml). A total of 21 plant essential oils were screened for their antifungal activity against these multi-drug resistant isolates. The oils of Cymbopogon martini, i.e., citral and cinnamaldehyde, exhibited strong inhibitory activity with minimum inhibitory concentrations (MIC 50) ranging from 90-100 mu g/ml. The test oils were more effective than fluconazole and amphotericin B in inhibiting azole- and amphotericin B-resistant, as well as amphotericin B-susceptible isolates. The test oils and especially eugenol, exhibited significant synergy with fluconazole or amphotericin B against the test isolates. These findings suggest the possible effective use of certain oils alone or in combination with fluconazole or amphotericin B, against multi-drug resistant isolates of C. albicans
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