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

Trichophyton violaceum

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Colonial Morphology	Microscopic Morphology Phase Contrast	Biochemical Reactions: BCP, SDA and Urease
Growth rate: slow Texture: glabrous, wrinkled, heaped Thallus color: purplish red with white sectors Reverse: lavender to purple Subcultures become more downy and lose pigmentation	pyriform microconidia on thiamine agar rare, irregularly shaped macroconidia on thiamine agar chains of asymmetrical chlamydospores on BCP at 35°C	BCP: slowly alkaline, hydrolysis Urease: slow positive, after 7 days Vitamin requirement: thiamine Hair perforation: negative
Compare to and Differentiate from: T. rubrum T. raubitscheckii: thiamine requirement T. soudanense: pigmentation, BCP, reflexive branching	Etiology & Ecology anthrophilic Near and Middle East, Eastern Europe, North Africa, occasionally Latin America and Mediterranean, imported to North America and Western Europe Scalp, body "shower sites", rarely feet and nails Endothrix Institutional outbreaks etiology of other dermatophytes