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Assessing the accuracy of the DERMAGENIUS® 3.0 complete multiplex real-time PCR kit in dermatophyte species identification compared to culture-based methods
University of Skövde, School of Bioscience.
2025 (English)Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Dermatophytosis, a common fungal infection in humans, is traditionally diagnosed using culturing and microscopy, methods that can be labor-intensive, time-consuming, and can have limitations in accuracy. Other methods have been suggested in recent years to potentially reduce hands-on time and improve turnaround. This study aimed to evaluate the effectiveness of one of those methods, real-time PCR, specifically the DermaGenius® 3.0 Complete Multiplex real-time PCR kit in accurately distinguishing dermatophyte species compared to microscopy and MALDI- TOF mass spectrometry. Fourteen samples, including known dermatophytes and non- dermatophyte species, were analyzed using all three methods. Culturing on Sabouraud dextrose agar was necessary for microscopy and MALDI-TOF, while real-time PCR was performed directly on DNA extracted from quality control samples saved in sterile water. The DermaGenius® 3.0 kit demonstrated high sensitivity and a high negative predictive value. The overall agreement was found to be 85.7% for MALDI-TOF and 64.3% for real-time PCR when compared to microscopy. The McNemar’s test revealed a statistical significance in the agreement of species identification between real-time PCR and microscopy (p = 0.025), and between MALDI-TOF and real-time PCR (p = 0.008). However, no statistical significance was found between MALDI-TOF and microscopy (p = 0.157). The culture-dependent methods were limited by non-growth or contamination in several samples, a limitation that did not apply to real-time PCR since the DNA was extracted directly from the samples that had been saved in sterile water. The results suggest that while real-time PCR offers a sensitive approach for dermatophyte species identification, particularly because it can overcome limitations associated with culturing, further studies should be conducted to better understand how well PCR performs as a diagnostic method, especially in clinical settings.

Place, publisher, year, edition, pages
2025. , p. 45
National Category
Microbiology in the Medical Area
Identifiers
URN: urn:nbn:se:his:diva-25562OAI: oai:DiVA.org:his-25562DiVA, id: diva2:1985326
External cooperation
Unilabs Skövde
Subject / course
Bioscience
Educational program
Molekylär biodesign 180 hp
Supervisors
Examiners
Available from: 2025-07-23 Created: 2025-07-23 Last updated: 2025-09-29Bibliographically approved

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Microbiology in the Medical Area

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Citation style
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