Mould Identification: A Virtual Self Assessment
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Unknown 47 = Nannizzia nana
|A 53-year-old male abattoir worker presented with an erythematous, scaly and pustular lesion on his wrist. Direct microscopy showed the presence of fungal hyphae and the culture shown below was isolated.|
Colonies are flat, cream to buff in colour with a suede-like to powdery surface texture. Young colonies have a brownish-orange pigment which deepens into a dark reddish-brown with age.
Cultures produce numerous small ovoid to pyriform macroconidia with 1-3 cells, but mostly 2 cells, with relatively thin, finely echinulate (rough) walls, and broad truncate bases. Many macroconidia are borne on conidiophores (stalks) which do not stain readily. Occasional clavate microconidia are present, which distinguishes N. nana from some species of Chrysosporium. RG-2 organism.Nannizzia nana infection of pigs.
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