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[Fungal nail infections--an update: Part 1--Prevalence, epidemiology, predisposing conditions, and differential
P Nenoff1, G Ginter-Hanselmayer, H-J Tietz
1Haut- und Laborarzt/Allergologie, Andrologie, Labor für medizinische Mikrobiologie, Strasse des Friedens 8, 04579, Mölbis, Deutschland. nenoff@mykologie-experten.de
Abstract:
Onychomycosis describes a chronic fungal infection of the nails most frequently caused by dermatophytes, primarily Trichophyton rubrum. In addition, yeasts (e. g. Candida parapsilosis), more rarely molds (Scopulariopsis brevicaulis), play a role as causative agents of onychomycosis. However, in every case it has to be decided if these yeasts and molds are contaminants, or if they are growing secondarily on pathological altered nails. The point prevalence of onychomycosis in Germany is 12.4%, as demonstrated within the "Foot-Check-Study", which was a part of the European Achilles project. Although, onychomycosis is rarely diagnosed in children and teens, now an increase of fungal nail infections has been observed in childhood. More and more, diabetes mellitus becomes important as significant disposing factor both for tinea pedis and onychomycosis. By implication, the onychomycosis represents an independent and important predictor for development of diabetic foot syndrome and foot ulcer. When considering onychomycosis, a number of infectious and non-infectious nail changes must be excluded. While psoriasis of the nails does not represent a specific risk factor for onychomycosis, yeasts and molds are increasing isolated from patients with psoriatic nail involvement. In most cases this represents secondary growth of fungi on psoriatic nails. Recently, stigmatization and impairment of quality of life due to the onychomycosis has been proven.
Insights
Onychomycosis, a chronic fungal nail infection, is increasingly seen in children and linked to diabetes. Early diagnosis and treatment are crucial for preventing complications like diabetic foot syndrome.
Area of Science:
- Medical Mycology
- Dermatology
Context:
- Onychomycosis is a prevalent chronic fungal nail infection, predominantly caused by dermatophytes like Trichophyton rubrum.
- While less common, yeasts and molds can also cause onychomycosis, necessitating differentiation between causative agents and contaminants.
- The point prevalence in Germany is 12.4%, with a notable increase in childhood cases.
Purpose:
- To review the epidemiology, risk factors, and clinical significance of onychomycosis.
- To highlight the association between onychomycosis and diabetes mellitus, including its role as a predictor for diabetic foot syndrome.
- To discuss differential diagnoses and the impact of onychomycosis on quality of life.
Summary:
- Dermatophytes are the primary cause of onychomycosis, but yeasts and molds can also be involved.
- An increasing incidence in children and a strong link with diabetes mellitus are significant epidemiological trends.
- Onychomycosis is an independent predictor of diabetic foot syndrome and foot ulcers, underscoring its clinical importance.
Impact:
- Onychomycosis diagnosis requires excluding other nail conditions, with psoriasis noted as a factor for secondary fungal growth.
- The condition significantly impacts patients' quality of life, causing stigmatization.
- Understanding these aspects is vital for effective patient management and public health strategies.
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