DESCRIPTIONS OF MEDICAL FUNGI

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220 Descriptions of Medical Fungi Trichosporon asahii Akagi ex Sugita et al. a b 20 µm Trichosporon asahii (a) culture and (b) hyphae and arthroconidia. Antifungal Susceptibility: T. asahii (Australian National data); MIC µg/mL. No. 64 AmB 22 4 4 6 4 3 1 FLU 22 1 3 11 7 VORI 20 1 1 7 10 1 POSA 19 1 1 11 4 2 ITRA 22 3 15 3 1 Note: Non-T. asahii isolates appear to be more susceptible than T. asahii isolates to AmB, FLU, and ITRA, while the new triazoles are active against both T. asahii and non-T. asahii isolates (Rodriguez-Tudela et al. 2005). Trichosporon inkin. Colonies are restricted, white, finely cerebriform with a granular covering, without marginal zone, often cracking the media.
Descriptions of Medical Fungi 221 Trichosporon asteroides (Rischin) Ota Morphological Description: Colonies are restricted, dry, cream-coloured, cerebriform, with radial furrows and irregular folds. The meristematic form is punctiform, brownish and consists of hyphae which swell and become multiseptate which may fall apart into smaller packets. Budding cells and lateral conidia are absent. Arthroconidia are elongate and hyphae are often present. Appressoria absent. This species assimilates L-arabinose but not myo-inositol. Growth at 37 O C is variable. Uncommon species usually associated with superficial infections. RG-2 organism. Assimilation Tests: + Positive, - Negative, v Variable, w Weak, s Slow Glucose + Melibiose - L-Rhamnose + D-Glucitol v Galactose + Raffinose - D-Glucosamine v α-M-D-glucoside + L-Sorbose v Melezitose + N-A-D-glucosamine + D-Gluconate + Sucrose + Soluble Starch + Glycerol + DL-Lactate + Maltose + D-Xylose + Erythritol + myo-Inositol - Cellobiose + L-Arabinose + Ribitol v Nitrate - Trehalose + D-Arabinose + Galactitol - 2-K-D-gluconate + Lactose + D-Ribose + D-Mannitol v D-Glucuronate + Trichosporon cutaneum (de Beurmann et al.) Ota Morphological Description: Colonies are cream-coloured, cerebriform, glabrous, with radial furrows and irregular folds. Budding cells abundant in primary cultures; hyphae developing in older cultures. Arthroconidia are cylindrical to ellipsoidal. Appressoria absent. This species assimilates melibiose; not tolerant to 0.1% (variable tolerance to 0.01%) cycloheximide. No growth at 37 O C. Uncommon species usually associated with superficial infections. RG-2 organism. Assimilation Tests: + Positive, - Negative, v Variable, w Weak, s Slow Glucose + Melibiose + L-Rhamnose + D-Glucitol + Galactose + Raffinose + D-Glucosamine v α-M-D-glucoside + L-Sorbose v Melezitose + N-A-D-glucosamine + D-Gluconate + Sucrose + Soluble Starch + Glycerol + DL-Lactate + Maltose + D-Xylose + Erythritol + myo-Inositol + Cellobiose + L-Arabinose + Ribitol + Nitrate - Trehalose + D-Arabinose v Galactitol - 2-K-D-gluconate + Lactose + D-Ribose + D-Mannitol + D-Glucuronate + Trichosporon inkin (Oho ex Ota) do Carmo-Sousa & van Uden Morphological Description: Colonies are restricted, white, finely cerebriform with a granular covering, without marginal zone, often cracking the media. Budding cells and lateral conidia absent. Arthroconidia are long cylindrical. Appressoria present in slide cultures. Sarcinae present on media with high sugar-content. This species assimilates myo-inositol but not melibiose and is tolerant to 0.01% (variable tolerance to 0.1%) cycloheximide. Growth at 37 O C. Usually associated with white piedra on pubic hairs. RG-2 organism.
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DESCRIPTIONS OF MEDICAL FUNGI

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