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