In vitro antifungal resistance profile of Candida strains isolated from Saudi women suffering from vulvovaginitis

Abstract

Background: Vulvovaginal candidiasis (VVC) represents a universal health hazard that contributes to significant morbidity in women. Resistance of Candida to antifungal therapy has been reported as a public health problem. So, the objective of our current study is to detect resistance profile of different candidal strains. Methods: In this study, isolated Candida strains were identified by conventional methods, confirmed by internal transcribed spacer (ITS) sequencing, and phylogenetically analyzed with reference strains in GenBank. Also, sensitivity of different Candida strains to common antifungal agents was evaluated by disc diffusion method. Results: Candida albicans was identified as the most frequent strain (63%) followed by non-albicans strains, such as C. glabrata (20%), C. tropicalis (13%), and C. krusei (4%). Sensitivity of Candida strains (C. albicans, C. tropicalis and C. glabrata) to commonly used antifungal agents was evaluated through the disc diffusion method. C. glabrata was the most resistant strain and considered to be a multidrug-resistant pathogen, while both, C. albicans and C. tropicalis showed high susceptibility to terbinafine. In contrast, C. albicans showed resistance to fluconazole, clotrimazole, and nystatin, while C. tropicalis, considered as the most sensitive strain, was susceptible to all the antifungal agents tested except nystatin. Terbinafine was the most effective antifungal agent against both C. tropicalis and C. albicans, and hence its minimum inhibitory concentration (MIC) and minimum fungicidal concentration (MFC) for C. albicans and C. tropicalis were evaluated. MICs of terbinafine against C. albicans and C. tropicalis were 5 μg/ml and 2.5 μg/ml, while their MFCs were 10 μg/ml and 5 μg/ml, respectively. Conclusion: The emergence of resistant Candida strains necessitates conduction of the antifungal susceptibility test prior to deciding the medication regime.