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DESCRIPTIONS OF MEDICAL FUNGI

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Descriptions of Medical Fungi 177<br />

Saprochaete clavata (de Hoog et al.) de Hoog & M.Th. Smith<br />

Synonmy: Geotrichum clavatum de Hoog, M.Th. Smith & Guého.<br />

Saprochaete clavata (formerly known as Geotrichum clavatum), which is also closely<br />

related to Magnusiomyces capitatus (formerly known as Geotrichum capitatum or<br />

Saprochaeta capitata), has only very infrequently been described as involved in invasive<br />

human infection. However, an outbreak of invasive infections caused by Saprochaete<br />

clavata in haematology patients has been reported (Vaux et al. 2013).<br />

RG-1 organism.<br />

Morphological Description: Colonies are moderately fast growing, flat, whitish and<br />

butyrous. True hyphae are abundant, soon breaking up into rectangular arthroconidia<br />

of variable size, 2.8-4 3 x 6-20 μm. Sympodial conidiogenesis is occasionally present.<br />

Terminal parts of hyphae may swell and become thick-walled.<br />

Note: Saprochaete clavata and Magnusiomyces capitatus are human pathogens that<br />

are closely related and are frequently mistaken for each other.<br />

Molecular Identification: ITS sequencing is recommended for accurate species<br />

identification.<br />

MALDI-T<strong>OF</strong> MS: reliably identifies S. clavata, M. capitatus and Geotrichum candidum<br />

to the species level (Desnos-Ollivier et al. 2014).<br />

Physiological Tests: + Positive, - Negative, v Variable, w Weak, s Slow, nd No Data<br />

Germ Tube - L-Sorbose + L-Arabinose - D-Glucitol -<br />

Fermentation Sucrose - D-Arabinose - M-D-glucoside -<br />

Glucose - Maltose - D-Ribose - D-Gluconate -<br />

Galactose - Cellobiose + L-Rhamnose - DL-Lactate +,w<br />

Sucrose - Trehalose - D-Glucosamine - myo-Inositol -<br />

Maltose - Lactose - N-A-D-glucosamine nd 2-K-D-gluconate -<br />

Lactose - Melibiose - Glycerol + D-Glucuronate nd<br />

Trehalose - Raffinose - Erythritol - Nitrate -<br />

Assimilation Melezitose - Ribitol - Urease -<br />

Glucose + Soluble Starch - Galactitol - 0.1% Cycloheximide -<br />

Galactose + D-Xylose - D-Mannitol - Growth at 37 O C +<br />

Antifungal Susceptibility: Saprochaete clavata (Vaux et al. 2013); MIC µg/mL.<br />

Note: S. clavata is intrinsically resistant to echinocandins.<br />

Antifungal Range Median Antifungal Range Median<br />

AmB 0.125-1 0.5 POSA 0.125-1 0.5<br />

5FC

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