Biochemical typing and evaluation of pathogenicity in vulvovaginal isolates of Candida albicans complex
Abstract
Introduction. Candida albicans, C. dubliniensis, and C. africana form the Candida albicans complex.
Objective. To identify the phenotypic and pathogenic characteristics of isolates of the C. albicans complex preserved in a collection.
Materials and methods. Three hundred presumptive strains of the C. albicans complex were evaluated using CHROMagarTM Candida. Germ tube production was determined by
three methods, chlamydospores formation was assessed and colonies were characterized in artisanal agars (Rosmarinus officinalis and Nicotiana tabacum). MALDI-TOF was used as the gold standard identification test. To detect pathogenicity factors, we evaluated the hemolytic activity of each isolate and cocultured with Staphylococcus aureus, coagulase enzyme production, and biofilm formation.
Results. Out of the 300 isolates, 43.7% produced germ tube in the heart-brain infusion broth and 47% of the isolates produced chlamydospores. In the artisan media, 6% of the isolates produced brown colonies on rosemary agar and 5% did so on tobacco agar. None of the strains hemolyzed the blood agar alone or cocultured with S. aureus. However, 50% of the isolates hemolyzed the potato dextrose agar supplemented with blood. All strains were coagulase producers, and biofilm production was variable. For germ tube production, the human serum method showed the same positivity as the milk broth method. All isolates were identified as C. albicans by MALDI-TOF.
Conclusions. The use of proteomics, molecular tests or a combination of methods is required for species identification.
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References
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Funding data
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Ministerio de Ciencia y Tecnología
Grant numbers 891 de 2020
