Trichophyton verrucosum
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| Trichophyton verrucosum | ||||||||||||
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Trichophyton verrucosum is askin fungus that colonizesthe horny substance and primarily affects animals ( zoophilic dermatophyte ). The main host for the pathogen is cattle , in which it triggers bovine trichophytia . But it can also be transmitted to other animals and humans, so it belongs to the zoonotic pathogens . Like all dermatophytes feeds T. verrucosum of keratin . The transmission occurs through direct or indirect contact. The teleomorph , i.e. the sexual stage of T. verrucosum , is still unknown.
On nutrient media is T. verrucosum very slow growing, cartilaginous brain-like, grayish-yellowish colonies with cream-colored back. Micro conidia are rare and can often be only after the addition of thiamine and inositol for Agar evidence. Macroconidia are extremely rare. They are small and consist of 3–5 chambers. The spores are arranged at the end, the hyphae are strongly branched.
T. verrucosum is the only dermatophyte whose growth optimum is at temperatures above 35 ° C. It therefore usually causes dermatophytoses that penetrate deeply into the skin and involve regional lymph nodes . The skin shows weeping pustules with severe reddening. People who have close contact with cattle (farmers, veterinarians, agrotourists ) are more frequently affected .
literature
- H.-J. Tietz, H. Ulbricht: Human pathogenic fungi of the skin and mucous membranes . Schlütersche, Hannover 1999. ISBN 3-87706-540-6
- Irene Weitzman and Richard S. Summerbell: 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. ( 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.