Microsporum gypseum

Species of fungus

Microsporum gypseum is a species of fungus in the genus Microsporum, which is part of the family Arthrodermataceae. This fungus is known for causing dermatophytosis, a type of fungal infection of the skin, commonly referred to as ringworm.

Morphology

Microsporum gypseum colony on culture medium

Microsporum gypseum is characterized by its distinctive colony morphology. The colonies are typically flat, spreading, and powdery in texture. They exhibit a cinnamon-brown color on the surface, with a yellowish-brown reverse. Microscopically, M. gypseum produces numerous macroconidia, which are large, spindle-shaped spores with thick walls and a rough surface. These macroconidia are typically 4-6 celled and are a key feature in the identification of this species.

Habitat and Ecology

Microsporum gypseum is a geophilic fungus, meaning it is commonly found in soil. It thrives in warm, humid environments and is often isolated from soil samples around the world. This species plays a role in the decomposition of keratinous materials in the environment, such as hair and feathers, contributing to nutrient cycling in soil ecosystems.

Pathogenicity

Microsporum gypseum infection on human skin

Microsporum gypseum is an opportunistic pathogen that can infect humans and animals, leading to dermatophytosis. In humans, it primarily causes infections of the skin, hair, and nails. The infection is characterized by circular, scaly patches on the skin, often with a raised, red border. In animals, particularly domestic animals like dogs and cats, it can cause similar skin infections.

Diagnosis and Treatment

Diagnosis of Microsporum gypseum infections is typically made through clinical examination and laboratory testing. Skin scrapings, hair samples, or nail clippings can be examined microscopically for the presence of fungal elements. Culture on specific media can confirm the diagnosis by allowing the fungus to grow and be identified based on its morphological characteristics.

Treatment of infections caused by M. gypseum involves the use of antifungal medications. Topical antifungals are often effective for mild infections, while systemic antifungal therapy may be required for more severe or widespread infections.

Prevention

Preventing infections caused by Microsporum gypseum involves maintaining good hygiene and avoiding contact with contaminated soil or infected animals. Regular cleaning and disinfection of areas where animals are housed can help reduce the risk of transmission.

Related pages

• Dermatophyte
• Ringworm
• Fungal infection