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Dermatophytes and Fungal Infections Among Athletes

Dermatophytes under fluorescent microscopyJoseph Bikowski, MD
Clinical Assistant Professor of Dermatology at Ohio State University in Columbus, OH.

Image: Filamentous Fungi (Dermatophytes) / MicrobeLibrary.org

Dermatophytoses are prevalent, prompting well over four million physician visits annually in the US.1 In the general population of the US, data suggest that onychomycosis is most common (23.2 percent of all dermatophytoses), followed by tinea corporis (20.4 percent), tinea pedis (18.8 percent), tinea capitis (15 percent), and tinea cruris (8.4 percent).1

Reliable recent data for disease prevalence among athletes are not available, though it seems from clinical experience that superficial cutaneous infections—tinea pedis, tinea cruris or “jock itch,” tinea corporis, tinea faciale, and tinea manus—are more common complaints among athletes than is onychomycosis.

Consider that the term “tinea gladiatorum” has been applied specifically to tinea corporis caused by the dermatophyte Trichophyton tonsurans in competitive wrestlers.2 And in one recent survey, 69 percent of professional soccer players, 69 percent of male college soccer players, and 43 percent of female college soccer players were found to have tinea pedis, compared to just 20 percent of male non-athletes and none of the female non-athletes.3

Several factors contribute to the increased incidence of dermatophytoses in athletes. Dermatophytes thrive in the moist environments that perspiration creates in skin folds and interdigital skin spaces or athletic equipment. Furthermore, there may be enhanced opportunity for the spread of infection between sport enthusiasts: Athletic shower rooms are a confirmed source of dermatophyte infections.4 Additionally, dermatophytes may colonize footwear or other athletic equipment that may be shared by individuals. Improperly laundered towels, socks, or other items may harbor dermatophytes and facilitate infection spread.5 Rarely does the diagnosis of tinea pose challenges for the clinical dermatologist. Treatment, however, can be a different matter. Most cases of dermatphytosis can be managed with topical antifungals (Table 1). Oral antifungals typically are reserved for extensive or chronic involvement or when application of a topical agent is physically challenging for the patient.6 Treatment must be selected that is expected to address the causative organism and in a vehicle formulation that the patient can easily apply to the treatment site. A broad-spectrum antifungal is preferred and is especially important in the case of inflammatory, malodorous presentations of tinea pedis, because the conversion from a scaling, erythematous presentation to a more macerated, malodorous, symptomatic process indicates that bacteria have proliferated.7

Allergic contact dermatitis of the feet or hands may mimic tinea pedis or manuum, respectively, and must be considered in the differential diagnosis. Of note, a dermatitis that develops on both hands and both feet is more likely to have a systemic cause rather than to be an allergic contact dermatitis.8 Conversely, involvement of two feet and one hand suggests a primary fungal infection of the foot that has been transferred to one hand only.9 Why the other hand is not involved is still a puzzlement.

Strategies to prevent recurrence or subsequent infection are as important as medically treating the dermatophytosis, though some proposed strategies may be unrealistic for patients. (See sidebar.) Simple preventive strategies have been shown effective. Wearing clean socks (but not stockings) was shown to prevent passage of dermatophytes from colonized shoes to the feet.10 In addition to wearing shower shoes, individuals with healthy feet who use public showers should wash the feet with soap and carefully wipe and dry the feet to remove any adherent dermatophytes. Laundering at temperatures of 140 degrees F or higher can remove or kill T. rubrum and C. albicans.11 This is a standard temperature for home water heaters, so residential washing machines can achieve this temperature. Permitting shoes to dry thoroughly before wearing them again may also be effective for reducing dermatophyte transmission.

Prophylactic topical antifungal therapy applied at intervals may be indicated for those at high risk for or with a history of recurrence of dermatophytosis.

Tinea pedis or manuum may provide a reservoir of dermatophytes leading to onychomycosis, though in some cases nail involvement is a primary presentation. Development of topical therapies for onychomycosis has proven challenging, due to the difficulty of penetrating the nail plate to deliver drugs to the nail bed, the site of infection. Therefore, systemic antifungal therapy has been the mainstay of treatment. Although systemic terbinafine and itraconazole are shown to be effective and generally safe for the management of onychomycosis,12 there are potential risks associated with therapy.13 Given this albeit very low risk, some patients prefer to avoid or postpone systemic therapy.

For distal subungual onychomycosis, a topically applied, low-viscosity, alcohol-based antifungal solution (sulconazole nitrate 1%, Exelderm, Ranbaxy Laboratories) may offer benefit when properly applied. Therapeutic success requires that the patient deliver the solution directly into the nail bed by placing the toe or fingernail in an upright position then instilling one to two drops subungually between the nail plate and nail bed. The patient should hold the toe or finger in an upright position for 30 seconds, to allow gravity to pull the active agent into the nail bed. Treatment should be applied twice daily. Coexistent tinea pedis or manuum must be managed to minimize the risk of re-infection of the nail.

Superficial cutaneous yeast infections may be predominantly caused by Candida. Among immunocompetent individuals, candidiasis may be especially common in the inframammary folds or genital crease region (more so for women than men). Culture can be used to distinguish Candidiasis from dermatophytosis. Topical antimycotics are standard treatment for candidiasis, particularly clotrimazole or ketoconazole. Oral fluconazole is the primary systemic agent with anti-Candida activity.

Another yeast infection that may affect athletes is Malassezia folliculitus (previously called pityrosporum follicultius). Papulopustules are found in a follicular pattern on the back, chest, upper arms, and, occasionally the neck, and face into the scalp. Monomorrphous erythematoid papulpustules measure 1-2mm in diameter and are frequently misdiagnosed as acne vulgaris. The yeast is ubiquitous on the skin and its growth is encouraged by heat. Moisture, friction, occlusion, sweating and increased oil production appear to contribute to exacerbation.


 

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  11. Gupta AK, Konnikov N, Lynde CW. Single-blind, randomized, prospective study on terbinafine and itraconazole for treatment of dermatophyte toenail onychomycosis in the elderly. J Am Acad Dermatol. 2001 Mar;44(3):479-84.
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  13. http://emedicine.medscape.com/article/1091037-overview

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