Mould Identification: A Virtual Self Assessment
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Unknown 70 = Trichophyton quinckeanum
|A 8 year boy presented with a scaly erythematous lesion on the arm showing numerous thick saucer-shaped scutula. Skin scales were collected for microscopy and culture.|
Human (top) and mouse (bottom) favus showing thick saucer-shaped scutula caused by T. quinckeanum
Cultures of T. quinckeanum are white, downy and dome-shaped when young; becoming heaped, folded and powdery due to the production of numerous microconidia with age. Reverse pigmentation is usually yellow-brown in colour.
Microscopic morphology of T. quinckeanum showing numerous microconidia, which are predominantly slender, clavate when young and borne laterally along the sides of the hyphae. With age the microconidia become broader and pyriform with some subspherical forms. Occasional to moderate numbers of smooth-walled, multiseptate, clavate macroconidia may be present in young cultures. RG-2 organism.
Distribution: Difficult to establish but probably world-wide. Often associated with mice plagues in the Australian Wheat Belt.
Key Features: Culture characteristics, microscopic morphology, contact with mice, odour and rapid urease test.
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