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Culturing dermatophytes rapidly from each toe web by fingertip.
Takao Sano1, Takuro Katoh, Kiyoshi Nishioka
1Department of Dermatology, Tokyo Medical and Dental University, School of Medicine, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
The Journal of Dermatology
|May 24, 2005
Summary
A new finger-sampling method effectively cultures dermatophytes from toe webs, aiding tinea pedis diagnosis. This technique offers a reliable and efficient alternative to traditional skin scraping cultures for identifying fungal infections.
Area of Science:
- Medical Mycology
- Dermatology
- Infectious Diseases
Background:
- Tinea pedis diagnosis relies on microscopy and fungal culture.
- Traditional fungal culture is accurate but time- and cost-intensive.
- A need exists for a more efficient diagnostic method.
Purpose of the Study:
- To introduce and evaluate a novel 'finger-sampling method' for dermatophyte culture.
- To compare the efficacy of the finger-sampling method with traditional techniques.
- To assess the method's utility in detecting early-stage or subclinical infections.
Main Methods:
- Development of the 'finger-sampling method' using an examiner's fingertip for sample collection.
- Application of the method to 50 patients with untreated tinea pedis.
- Comparison of results with KOH microscopy and traditional slant cultures.
Main Results:
- Dermatophytes were isolated from 78% of KOH-positive toe webs using the finger-sampling method.
- Isolation rates were comparable to traditional methods.
- The method detected infections in KOH-negative and even normal-appearing toe webs (36% and 16% positivity, respectively).
- Efficacy was confirmed in detecting dermatophyte attachment on healthy skin after exposure.
Conclusions:
- The finger-sampling method is a viable and efficient alternative for diagnosing tinea pedis.
- This technique can identify infections missed by traditional methods.
- It holds potential for early detection and public health interventions against fungal infections.