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Original Article

Tinea versicolor and Pityrosporum orbiculare: A mycological investigation

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Pages 171-179 | Published online: 09 Jul 2009
 

Abstract

It has generally been accepted that the cause of tinea versicolor is the dimorphic lipophilic fungus Pityrosporum orbiculare. In this investigation the fungus was cultured from all patients with tinea versicolor. It was also isolated from normal-looking skin and apparently healed lesions in a high proportion of patients with tinea versicolor; from patients with seborrheic dermatitis, and from healthy volunteers.

Isolation of P. orbiculare was most satisfactorily achieved on a peptone-glucose-yeast extract medium containing glycerol monostearate, overlaid with olive oil. Germ tubes were produced when P. orbiculare was incubated in an atmosphere containing air with 7% CO2. Cultures of P. orbiculare and P. ovale did not show fluorescence in Wood's light.

Résumé

II est généralement admis que l'agent de tinea versicolor est le champignon dimorphique et lipophile Pityrosporum orbiculare.

Dans lá présente étude le champignon a été isolé de tous les malades atteints de tinea versicolor. II a également été isolé de la peau à apparance normale et d'affections apparement guéries d'un grand nombre de malades atteints de tinea versicolor; de plus il a été isolé de malades souffrant de dermatite séborrhéique et des volontaires sains.

L'isolement de P. orbiculare se fait aisément sur milieu solide de Sabouraud contenant du monostérate de glycérol et recouvert d'huile d'olive. Des filaments rudimentaires ont été produits en milieu solide de Sabouraud glucosé, en atmosphère à 7% de CO2. Les cultures de P. orbiculare et de P. ovale, exposées à la lumière de Wood, n'ont pas montré de fluorescence.

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