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ACS Biomaterials Science & Engineering

ACS Biomaterials Science & Engineering

IF: 5.4
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Hepatic phaeohyphomycosis due to a novel dematiaceous fungus, Pleurostoma hongkongense sp. nov., and importance of antifungal susceptibility testing

Published:1 December 2021 DOI: 10.1080/22221751.2020.1866955 PMID: 33337289
Chi-Ching Tsang,?Ka-Fai Chan,?Walton Chan,?Jasper F W Chan,?Rex K H Au-Yeung,?Antonio H Y Ngan,?Ken P K Lin,?Susanna K P Lau,?Patrick C Y Woo

Abstract

Pleurostoma species are wood-inhabiting fungi and emerging opportunistic pathogens causing phaeohyphomycosis. In this study, we isolated a dematiaceous fungus, HKU44T, from the subhepatic abscess pus and drain fluids of a liver transplant recipient with post-transplant biliary and hepatico-jejunostomy bypass strictures. Histology of the abscess wall biopsy showed abundant fungal hyphae. The patient survived after a second liver transplant and antifungal therapy. On SDA, HKU44T grew initially as white powdery colonies which turned beige upon maturation. Hyphae were septate and hyaline. Phialides were monophialidic and laterally located, generally closely associated to a cluster of conidia which were usually reniform. Phylogenetic analyses showed that HKU44T is most closely related to, but distinct from, Pleurostoma ootheca and Pleurostoma repens. These suggested that HKU44T is a novel Pleurostoma species, for which the name Pleurostoma hongkongense sp. nov. is proposed. Antifungal susceptibility testing showed that Pleurostoma species possessed high MICs/MECs for fluconazole, 5-flucytosine and the echinocandins; whereas they exhibited a high strain-to-strain variability to the susceptibilities to the other triazoles. As for amphotericin B, ~65% of the Pleurostoma strains had low MICs (≤1?μg/mL). DNA sequencing should be performed to accurately identify fungi with Pleurostoma/Phialophora-like morphologies, so is antifungal susceptibility testing for patients with Pleurostoma infections.

Substances (34)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Fluconazole 86386-73-4 C13H12F2N6O 1187 suppliers $5.00-$1504.50
Fluconazole 86386-73-4 C13H12F2N6O 1187 suppliers $5.00-$1504.50
Fluconazole 86386-73-4 C13H12F2N6O 1187 suppliers $5.00-$1504.50
Fluconazole 86386-73-4 C13H12F2N6O 1187 suppliers $5.00-$1504.50
Itraconazole 84625-61-6 C35H38Cl2N8O4 881 suppliers $4.00-$1504.50
Itraconazole 84625-61-6 C35H38Cl2N8O4 881 suppliers $4.00-$1504.50
Itraconazole 84625-61-6 C35H38Cl2N8O4 881 suppliers $4.00-$1504.50
Itraconazole 84625-61-6 C35H38Cl2N8O4 881 suppliers $4.00-$1504.50
Voriconazole 137234-62-9 C16H14F3N5O 749 suppliers $9.00-$2744.01
Voriconazole 137234-62-9 C16H14F3N5O 749 suppliers $9.00-$2744.01

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