Trichophyton rubrum
| Trichophyton rubrum | ||||||||||||
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Macro and micro conidia of Tr. rubrum |
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| Scientific name | ||||||||||||
| Trichophyton rubrum | ||||||||||||
| Sabour. |
Trichophyton rubrum is askin fungus ( anthropophilic dermatophyte )thatcolonizesthe horny substance in humans. It cantriggernumerous dermatophytoses in humans; the pathogen is currently particularly common in foot and nail fungus and tinea inguinalis . Like all dermatophytes feeds Trichophyton rubrum of keratin . The transmission from person to person occurs through direct or indirect contact. Transmission from humans to animals is also rare. The teleomorph , i.e. the sexual stage of T. rubrum , is still unknown.
In the native preparation , T. rubrum shows itself in skin diseases in the form of a widely branched mycelium , in nail fungus as spore chains. On a Sabouraud dextrose agar , the fungus forms white colonies with radial folds that turn greenish or red to purple at the edge; in the Woodlicht diagnosis it shows no fluorescence. A yellow, later red border forms on the Mycosel medium. The underside of the culture is wine-red on both nutrient media. In the microscopic image it is characterized by numerous pear-shaped and spike-shaped microconidia . Macroconidia are rare and cigar-shaped with 3–8 chambers. Spores are rarely visible.
T. rubrum was mainly found in the USA and the Middle East. It now occurs worldwide, and its frequency is also increasing rapidly in Europe.
literature
- Hans-Jürgen Tietz, Horst Ulbricht: Human pathogenic fungi of the skin and mucous membranes . Hanover: Schlütersche, 1999. ISBN 3-87706-540-6
- Irene Weitzman and Richard S. Summerbell: The Dermatophytes . In: Clin. Microbiol. Rev. 8 (1995), pp. 240-259. PMID 7621400 , PMC 172857 (free full text)
- Heinz Seeliger and Theresia Heymer: Diagnostics of pathogenic fungi in humans . Textbook and atlas. Stuttgart, New York 1981, ISBN 3-13-595301-7 , pp. 134-137 ( PDF )
Individual evidence
- ↑ H.-J. Tietz and Renate Hämmerling: The importance of zoophilic dermatophytes for humans and anthropophilic zoonoses for animals. In: Prakt. Tierarzt 88 (2007), pp. 78-86.