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School of Biological Sciences
The University of Adelaide
AUSTRALIA 5005

Contact:
Dr David Ellis
Email


Microsporum

Based on a recent multilocus phylogenetic study the taxonomy of the dermatophytes has been reviewed. Trichophyton now contains 15 species, Epidermophyton one species, Nannizzia 7 species, Microsporum 3 species, Lophophyton 5 species, and Arthroderma 20 species (de Hoog et al. 2016).

The genus Microsporum is now restricted to just three species: M. audouinii, M. canis and M. ferrugineum. The remaining geophilic and zoophilic species, previously considered Microsporum species, have been transferred to the genera Lophophyton and Nannizzia.

Microsporum species may form both macro- and microconidia, although they are not always present. Cultures are mostly granular to cottony, yellowish to brownish, with a cream-coloured or brown colony reverse. Macroconidia are hyaline, multiseptate, with thick rough cell walls, and are clavate, fusiform or spindle-shaped. Microconidia are single-celled, hyaline, smooth-walled, and are predominantly clavate in shape.

Note: Strains of M. canis often do not produce macroconidia and/or microconidia on primary isolation media and subcultures onto polished rice grains or lactritmel agar are recommended to stimulate sporulation. These non-sporulating strains of M. canis are often erroneously identified as M. audouinii and it is surprising just how many laboratories have difficulty in differentiating M. canis and M. audouinii.

Molecular Identification: ITS sequencing is recommended (Gräser et al. 1998, 2000, Brillowska-Dabrowska et al. 2013).

References: Rebell and Taplin (1970), Rippon (1988), McGinnis (1980), Domsch et al. (1980), Ajello (1977), Weitzman et al. (1986), Mackenzie et al. (1986), Kane et al. (1997), de Hoog et al. (2000, 2015), Gräser et al. (1999a, 2008). Cafarchia et al. (2013).

Microsporum audouinii

Microsporum canis

Microsporum ferrugineum

 

MIC data is limited.  Antifungal susceptibility testing of individual strains is recommended.

Antifungal MIC ug/mL Antifungal
MIC ug/mL
Range
MIC90
Range
MIC90
Griseofulvin
0.125-2
1
Amphotericin B
0.03-8
1-2
Itraconazole
0.01-4
0.125
Fluconazole
0.05->64
>64
Terbinafine
0.01-16
0.06
Voriconazole
0.007-1
0.5