Skip to content

Mould Identification: A Virtual Self Assessment

Excellent you have really done well.

Please find additional information below

Unknown 47 = Nannizzia nana

Case History
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.
Clinical Presentation
scaly, pustular lesions on a wrist

Culture
Culture

Culture

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.
Microscopy
microscopic view

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.

infection on pigs

Nannizzia nana infection of pigs.
Comment: Nannizzia nana is a geophilic and zoophilic fungus frequently causing chronic non-inflammatory lesions in pigs and a rare cause of tinea in humans. Also present in soil of pig-yards. Infections in man usually contacted directly from pig or fomites. Invaded hairs may show a sparse ectothrix or endothrix infection but do not fluoresce under Wood's ultra-violet light. The geographical distribution is world-wide.

About Nannizzia Back to Virtual Assessment

What is your identification?

Trichophyton mentagrophytes
Nannizzia nana
Arthroderma unicinatum

Sorry, that answer is incorrect. Please try again.
School of Biological Sciences
Address

THE UNIVERSITY OF ADELAIDE
SA 5005 AUSTRALIA

Contact

Dr David Ellis
Email