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Onychomycosis in Hong Kong
International Journal of Dermatology
|December 31, 1997
Summary
Dermatophytes are the primary cause of onychomycosis (nail fungal infections) in Hong Kong, more so than yeasts. Climate changes significantly impact dermatophyte prevalence, influencing nail infection patterns.
Area of Science:
- Medical Mycology
- Epidemiology
- Dermatology
Background:
- Onychomycosis epidemiology is well-documented in temperate regions, but data from tropical areas are scarce.
- This study investigates the prevalence and characteristics of onychomycosis in Hong Kong, a subtropical region.
Purpose of the Study:
- To determine the etiological agents of onychomycosis in Hong Kong.
- To analyze demographic and seasonal variations in onychomycosis cases.
- To assess the impact of climatic conditions on fungal prevalence.
Main Methods:
- A retrospective analysis of mycology laboratory records from January 1987 to December 1994.
- Examination of nail samples (clippings, scrapings, drillings) using microscopy and culture.
- Identification of causative fungi, including dermatophytes, yeasts, and molds.
Main Results:
- Of 2382 nail samples, 14.3% were microscopy positive, with 48.5% of these being culture positive.
- Dermatophytes and yeasts accounted for 97% of culture-positive cases; dermatophytes (29.1%) were more common than yeasts (19.4%).
- Trichophyton rubrum was the most common dermatophyte; Candida spp. (non-albicans) were the most frequent yeasts. Peak incidence occurred in summer months.
Conclusions:
- Dermatophytes are the predominant cause of onychomycosis in Hong Kong.
- Climatic factors influence the prevalence of dermatophytes more significantly than yeasts.
- Understanding these epidemiological patterns is crucial for effective management of nail fungal infections.