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What does Microsporum look like?

What does Microsporum look like?

Microsporum distortum is a zoophilic dermatophyte that rarely infects humans. It has been isolated from ringworm in dogs, cats, horses, swine, guinea pigs, monkeys, rabbits, and humans (4,6). It produces a yellow-greenish fluorescence in hair, where it is associated with small ectothrix spores.

How do you identify a Microsporum?

Their shape, size and cell wall features are important characteristics for species identification. Microconidia are hyaline, single-celled, pyriform to clavate, smooth-walled, 2.5–3.5 by 4–7 um in size and are not diagnostic for any one species.

What is Microsporum canis in humans?

Microsporum canis is a dermatophyte fungus of which cats and dogs are recognized as the natural hosts. M. canis is also easily transmitted to humans, causing lesions to the glabrous skin (tinea corporis) and to the head (tinea capitis).

Does Microsporum affect nail?

Infection was limited to nails only and disease duration ranged from 1 month to 20 years (mean = 6.55 years). The toenails were affected in all cases except for a single M.

How does Microsporum grow?

Spores are very resistant, attach to the skin and germinate producing hyphae, which will then grow in the dead, superficial layers of the skin, hair or nails. Similar to other fungal dermatophytes, M. canis also secretes keratinolytic protease and gains energy from keratin in nails, hair, and skin.

How would you describe a fungal rash on a physical exam?

On physical exam, single or multiple lesions are usually circular or ovoid in appearance with patches and plaques. These annular lesions demonstrate sharp marginations with a raised erythematous scaly edge which may contain vesicles.

What does Microsporum Gypseum cause?

Dermatophytosis caused by M. gypseum usually manifests as an inflammatory mycosis that typically affects the glabrous skin and scalp, especially in children. Rarely, it can present as onychomycosis.

Does microsporum affect hair?

Microsporum canis infections are noninflammatory and characterized by scaling and patchy hair loss. The infected areas are round, oval, or irregular and 1 to 6 cm in diameter, and multiple patches are common (Fig. 126-6). “Black dots,” which are short (1- to 3-mm), broken-off hairs, may be noted in areas of alopecia.

What is the treatment for microsporum?

A variety of oral and topical antifungal agents is available and drugs such as griseofulvin (Gri), terbinafine (TER), itraconazole (IT), and fluconazole (FLZ) are used to cure severe infections in humans and animals [2,13,14].

What is Microsporum audouinii?

Trichophyton tonsurans, Microsporum canis, and Microsporum audouinii are most common. The condition presents with hair loss (alopecia), usually with scale. Patchy areas of broken hairs covered by white scales can resemble seborrheic dermatitis.

How can Microsporum audouinii infection in children be prevented?

To prevent this, contacts of children infected with Microsporum audouinii can be examined for infected fluorescent hairs with Wood’s light (ultraviolet light filtered through nickel oxide glass).

Can Microsporum audouinii cause tinea capitis?

Microsporum audouinii often found in soil that is rich in keratinous material. causing epidemic juvenile tinea capitis in humans. 1. Two colony types may be observed. The first type is glabrous, heaped, wrinkled and often has furrows and folds. color is yellow to rust from the front and a dull orange pigmentation is observed from the reverse. 2.

What is Microsporum spp?

Microsporum spp is a genus of fungi, which is responsible for different types of skin infection such as, tinea capitis, tinea corporis, ringworm, and other dermatophytosis (fungal infections of the skin) They only affect all keratinized areas of the body (hair, skin and nails)