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School of Molecular & Biomedical Science |
Microsporum fulvumTeleomorph: Arthroderma fulvum Colonies are fast growing, flat, suede-like, tawny-buff to pinkish-buff in colour and frequently have a fluffy white advancing edge. A dark red undersurface is occasionally seen, otherwise it is colourless to yellow brown. Abundant thin-walled, elongate, ellipsoidal macroconidia are formed which closely resemble those of M. gypseum, except they are longer and more bullet-shaped (clavate) with 3 to 6 septa. Numerous spiral hyphae, which are often branched are seen. Numerous pyriform to clavate microconidia are also produced but these are not diagnostic. RG-1 organism.
Clinical significance:Microsporum fulvum is a geophilic fungus of world-wide distribution which may cause occasional infections in humans and animals. Clinical disease is similar to M. gypseum but less common and usually not separated from it in the literature. Invaded hairs show a sparse ectothrix infection but do not fluoresce under Wood's ultra-violet light. Mycosis: DermatophytosisFurther reading:Rippon, J.W. 1988. Medical Mycology. 3rd Edition. W.B. Saunders Co., Philadelphia, USA.
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