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Infectious Diseases of the Skin I: Dermatophytosis/Onychomycosis

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Molecular Diagnostics in Dermatology and Dermatopathology

Part of the book series: Current Clinical Pathology ((CCPATH))

Abstract

Dermatophytes are a unique group of fungi that infect keratinous tissue, including skin, hair, and nails, resulting in cutaneous mycoses called dermatophytoses, tinea, or ringworm infections. This closely-related group of organisms can be categorized into one of three genera: Trichophyton, Microsporum, and Epidermophyton. Species within these genera that do not invade keratinous ­tissue are, by definition, not regarded as dermatophytes. As with a number of fungi, dermatophytes may exhibit two phases in their life cycle: the anamorph state (imperfect or asexual phase), which is isolated in the laboratory; and the teleomorph state (perfect or sexual phase). Not all of the teleomorphs for dermatophyte species have been identified, but the generic name for both Trichophyton and Microsporum is Arthroderma [1]. Dermatophyte infections are generally named according to the anatomic locations involved. For example, infection of the feet, nails, scalp/eyebrows/eyelashes, groin, and other body sites are termed tinea pedis, tinea unguium, tinea capitis, tinea cruris (intertrigo), and tinea corporis, respectively. A single dermatophyte species may infect several anatomic sites, and different species can result in clinically identical lesions.

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Mukherjee, P.K., Isham, N., Ghannoum, M.A. (2011). Infectious Diseases of the Skin I: Dermatophytosis/Onychomycosis. In: Murphy, M. (eds) Molecular Diagnostics in Dermatology and Dermatopathology. Current Clinical Pathology. Humana Press. https://doi.org/10.1007/978-1-60761-171-4_15

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