Introduction Clinical Presentation Definition Distribution Etiology Index of Names Media & Methods Glossary Case Study References

Trichophyton mentagrophytes

Granular form on Phy (above) Velvety form on PYE(above) Downy form on PYE (above)	.	.
Colonial Morphology	Microscopic Morphology Phase Contrast	Biochemical Reactions: BCP, SDA and Urease
Granular form: Growth rate: moderate Texture: granular, flat Thallus color: buff to tan Reverse: pale yellow, tan, or reddish brown Velvety form: Growth rate: moderate Texture: velvety, flat, thin, with fine powder Thallus color: white to sandy to butter yellow Reverse: white to tan, rarely reddish brown Downy form: Growth rate: moderate Texture: deep, cottony Thallus color: white Reverse: pale yellow to tan	Velvety and granular forms: round microconidia in grape-like clusters spiral hyphae +/- cigar shaped, thin walled macroconidia, narrowly attached to hyphae Downy form: pyriform microconidia indistinguishable from T. rubrum	BCP: profuse/alkaline Urease: positive Vitamin requirement: none Hair perforation: positive
Compare to and Differentiate from: M. persicolor: growth at 35°C, BCP T. rubrum: BCP, urease, hair perforation, lack of red pigment on PDA T. equinum: no vitamin requirements, hair perforation T. terrestre: growth at 35°C, uniform conidia size	Etiology & Ecology anthrophilic and zoophilic - rodents, small and large mammals worldwide found in soil feet, body, nails, beard, scalp, hand, groin zoophilic are ectothrix; anthrophilic do not infect hair etiology of other dermatophytes