Mould Identification: A Virtual Self Assessment
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Unknown 61 = Microsporum canis
|An 8 year old child presented with a lesion of the scalp showing hair loss, scaling and advancing erythematous border. Hairs and skin scales were collected for microscopy and culture.|
Early infection of the scalp by M. canis showing hair loss, scaling and advancing erythematous border.
|Direct Microscopy (infected hair in KOH Parker ink preparation).|
Invaded hairs show an ectothrix infection and fluoresce a bright greenish-yellow under Wood's ultra-violet light.
Colonies of M. canis are flat, spreading, white to cream-coloured, with a dense cottony surface which may show some radial grooves. Colonies usually have a bright golden yellow to brownish yellow reverse pigment, but non-pigmented strains may also occur.
Macroconidia of M. canis are typically spindle-shaped with 5-15 cells, verrucose, thick-walled and often have a terminal knob, 35-110 x 12-25µm. A few pyriform to clavate microconidia are also present. Macroconidia and/or microconidia are often not produced on primary isolation media and it is recommended that sub-cultures be made onto Lactritmel Agar and/or boiled polished rice grains to stimulate sporulation. RG-2 organism.
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