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Biochemicals
Photo not available
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Colonial Morphology
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Microscopic Morphology Phase Contrast
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Biochemical Reactions: BCP, SDA and Urease
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- Growth rate: rapid
- Texture: silky to coarsely fluffy, radial grooves
- Thallus color: white
- Reverse: deep yellow
- Variants: slow growing, heaped and folded, yellow surface, no reverse pigment, macroconidia absent; reverts to typical colony on rice grains
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- long, rough, thick-walled macroconidia with asymmetrical knob on end
- few pyriform microconidia, lateral
- raquet hyphae, nodular bodies, and chlamydospores may be present
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- BCP: profuse, no change
- Urease: positive
- Hair perforation: positive
- Rice: good growth, yellow pigment, conidia produced
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Compare to and Differentiate from:
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Etiology & Ecology
- zoophilic - cats and dogs, less commonly monkeys, guinea pigs, horses, mice, cows, rabbits
- worldwide, less common in North America, UK , and Scandinavia than the rest of the world
- body in adults, scalp in children, rarely nails
- etiology of other dermatophytes
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