Dermatophytosis
A common fungal skin infection known as ringworm.
Dermatophytosis, also known as tinea and ringworm, is a fungal infection of the skin, hair, and nails caused by about 40 types of fungus, primarily of the Trichophyton, Microsporum, or Epidermophyton genera. It typically results in a red, itchy, scaly, circular rash and can affect multiple areas of the body simultaneously. The condition has been described since ancient history and is a global health issue, with up to 20% of the world's population possibly infected at any given time.
- field
- Infectious disease (mycology)
- known_for
- Fungal infection causing ring-shaped rashes on skin, hair, and nails
- global_prevalence
- Up to 20% of world population at any time
- incubation_period
- 4 to 14 days
- common_causative_genera
- Trichophyton, Microsporum, Epidermophyton
Lore & Background
Dermatophytosis is caused by dermatophytes that thrive in moist, warm environments such as locker rooms, swimming pools, and skin folds. Transmission occurs through direct contact with infected humans or animals, or via contaminated objects like towels, clothing, and hairbrushes. Risk factors include public shower use, contact sports, excessive sweating, animal contact, obesity, and poor immune function. Diagnosis is often based on appearance and symptoms, and can be confirmed by culturing or microscopic examination of skin scrapings.
Reader's Guide
Dermatophytosis is significant as one of the most widespread fungal infections globally, affecting up to 20% of the population at any time. Its types are named by body site—such as tinea pedis (athlete's foot), tinea capitis (scalp), and tinea cruris (jock itch)—and it can affect both humans and animals, including dogs, cats, and cattle. Treatment typically involves topical antifungal creams like clotrimazole or miconazole, with oral antifungals such as fluconazole for scalp infections. Prevention focuses on keeping skin dry, avoiding barefoot walking in public, and not sharing personal items. The condition has been known since ancient times, and historical treatments included mercury, sulfur, iodine, and even X-rays for scalp infections. No approved human vaccine existed as of 2016, though veterinary vaccines are available for horses, dogs, cats, and cattle.
Did You Know?
- The term 'ringworm' is a misnomer because the condition is caused by fungi, not parasitic worms.
- Dermatophytosis can spread between animals and humans, making it a zoonotic disease.
- Infections of the groin are more common in males, while scalp and body infections occur equally in both sexes.
- A Cretaceous eutriconodont mammal fossil, Spinolestes, shows evidence of dermatophytosis, suggesting a Mesozoic origin for the disease.
More in Common Infections And Diseases 1-21
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