PCR enables rapid detection of dermatophytes in practice

Area of Science:

• Medical Mycology
• Clinical Diagnostics
• Molecular Biology

Background:

• Superficial fungal infections, like dermatophytosis, are common globally, affecting up to 25% of the population.
• Traditional culture-based methods for diagnosing dermatophytosis are slow, leading to delayed treatment.
• Rapid and accurate diagnostic tools are crucial for effective management of these widespread infections.

Purpose of the Study:

• To evaluate the transition from culture-based to nucleic acid-based detection (PCR) for dermatophyte infections in Northern Finland.
• To assess the performance and efficiency of a commercial real-time PCR assay in a large population.
• To determine the impact of PCR adoption on diagnostic turnaround time.

Main Methods:

• Analysis of 14,330 samples collected between 2019 and 2022 in Northern Finland.
• Comparison of results from culture-based methods with a commercial real-time PCR assay (DermaGenius 2.0 complete multiplex test).
• Evaluation of diagnostic turnaround time before and after the implementation of PCR.

Main Results:

• The PCR-based method has become the diagnostic standard for dermatophytosis in the studied region.
• The DermaGenius 2.0 assay detected more positive cases than culture and identified key dermatophytes and Candida albicans.
• Mean turnaround time decreased dramatically from 19 days to 16 hours with the PCR method.

Conclusions:

• PCR represents a significant advancement in diagnosing superficial fungal infections, offering speed and accuracy.
• The adoption of PCR in Northern Finland has streamlined diagnostics and improved patient care pathways.
• Faster diagnosis through PCR can help prevent unnecessary antifungal treatments and improve clinical decision-making.