Onychomycosis

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Summary of Onychomycosis

Onychomycosis, fungal infection of the nail, can cause disfigurement of the nail, pain, and may increase risk for soft tissue bacterial infection in immunocompromised patients. Dermatophytes, particularly Trichophyton rubrum, are the most common causes of onychomycosis. Yeast (Candida albicans) and nondermatophyte molds can also cause onychomycosis.

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Onychomycosis

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Onychomycosis

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USMLE® Step 1 style questions USMLE

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USMLE® Step 2 style questions USMLE

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Preview

A 21-year-old man comes to the clinic because his toenail has been disfigured for the past few weeks. Physical exam shows a fungal infection of his toenail, as seen below. KOH preparation verifies that it is a distal subungual onychomycosis. Which of the following fungi is the most likely cause of his infection?

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