DESCRIPTIONS OF MEDICAL FUNGI

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198 Descriptions of Medical Fungi Trichophyton eriotrephon Papegaaij, Nederl. Tijdschr. Geneesk Synonymy: Trichophyton mentagrophytes var. erinacei J.M.B. Smith & Marples. Trichophyton erinacei (Smith & Marples) Quaife. Trichophyton eriotrephon is a zoophilic fungus associated with hedgehogs and the epidermal mites, harboured by hedgehogs. Human infections occur most frequently on the exposed parts of the body, but tinea of the scalp and nails can also occur. Invaded hairs show an ectothrix infection but do not fluoresce under Wood’s ultra-violet light. The distribution of this fungus is New Zealand and Europe. RG-2 organism. Morphological Description: Colonies are white, flat, powdery, sometimes downy to fluffy with a brilliant lemon-yellow reverse. Numerous large clavate microconidia are borne on the sides of hyphae. Macroconidia are smooth-walled, two to six-celled, clavate, variable in size, and may have terminal appendages. Macroconidia are much shorter than those seen in T. mentagrophytes. Confirmatory Tests: Lactritmel Agar: White suede-like to powdery colony with brilliant yellow reverse. Numerous large slender clavate microconidia. Hydrolysis of Urea: Negative at 7 days. Vitamin Free Agar (Trichophyton Agar No.1): Good growth indicating no special nutritional requirements. Colonies are white suede-like to powdery with no reverse pigment. Hair Perforation Test: Positive. Key Features: Include microscopic morphology and culture characteristics; slender clavate microconidia and brilliant lemon-yellow reverse pigment on SDA; and negative hydrolysis of urea. Positive “in vitro” hair perforation test.
Descriptions of Medical Fungi 199 Trichophyton eriotrephon Papegaaij, Nederl. Tijdschr. Geneesk a c b 20 µm Trichophyton eriotrephon (a) culture, (b) microconidia and (c) macroconidia. Trichophyton eriotrephon is generally distinguished from T. mentagrophytes by: (a) its microscopic morphology showing numerous large slender clavate microconidia borne on the sides of hyphae and its smooth, thin-walled clavate macroconidia; (b) its brilliant lemon yellow reverse pigment on SDA and lactritmel agar; (c) its lack of reverse pigment on Sabouraud’s salt agar; and (d) its negative hydrolysis of urea.
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DESCRIPTIONS OF MEDICAL FUNGI

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