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Favus pathogen (Trichophyton schoenleinii)
Last reviewed: 08.07.2025
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Favus (synonym: scab) is a rare chronic disease, mainly of children, caused by Trichophyton schoenleinii.
The skin, hair and nails are affected. Yellow crusts (scutula) with clusters of spores and mycelium of the fungus, epidermal cells and fat are formed. Branching septate mycelium with arthrospores is observed in the scales. Gas bubbles and fungal elements are found inside the affected hair: septate mycelium, clusters of spores (favus type).
A pure culture of T. schoenleinii is represented by septate mycelium with thickenings and branches ("candelabra", "deer antlers"), as well as arthrospore mycelium, chlamydospores and macroconidia (8x50 µm).