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Paraphyton cookei

Synonymy:
Microsporum cookei; Microsporum racemosum.

Based on a recent taxonomic revision of the dermatophytes the genus Paraphyton has been created for three species (de Hoog et al. 2016).  Paraphyton cookei is a geophilic fungus which has been isolated from the hair of small mammals showing no clinical lesions. Infection has been reported in rodents, dogs and rarely in humans. It is not known to invade hair in vivo, but produces hair perforations in vitro.

RG-1 organism.

Morphological Description:
Colonies are flat, spreading, buff to pale brown, powdery to suede-like, with a slightly raised and folded centre and some radial grooves. Reverse pigment dark reddish-brown. Numerous large, very thick-walled, echinulate (rough) elliptical macroconidia with predominantly five to six septa but may be from two to eight septa. Occasional spiral hyphae may be seen. Moderate numbers of mainly slender clavate with some pyriform microconidia are present.

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