Species Distribution, Virulence Factors, and Antifungal Susceptibility Among Candida Parapsilosis Complex Isolates Recovered from Clinical Specimens

Overview

Journal Mycopathologia

Specialties Microbiology
Pharmacology

Date 2015 Jul 4

PMID 26138435

Citations 12

Authors

Beatriz Virginia da Silva

Larissa Beatriz Silva

Diego Batista Carneiro de Oliveira

Paulo Roberto da Silva

Kennio Ferreira-Paim

Leonardo Euripides Andrade-Silva

Mario Leon Silva-Vergara

Anderson Assuncao Andrade

Affiliations

Soon will be listed here.

Abstract

The Candida parapsilosis complex has emerged as an important fungal pathogen. In spite of this, relatively little is known about its characteristics. Thus, the purposes of this study were (1) to determine by BanI-RFLP-assay the occurrence of C. parapsilosis complex species among 81 clinical isolates primarily identified as C. parapsilosis; (2) to evaluate their in vitro production of virulence factors; and (3) to compare their susceptibility profiles, grown as planktonic cells and biofilms, against amphotericin B, fluconazole, voriconazole, and caspofungin by following the Clinical and Laboratory Standards Institute (CLSI) guidelines. Seventy-seven isolates (95%) were identified as C. parapsilosis sensu stricto, 2 (2.5%) as C. orthopsilosis, and 2 (2.5%) as C. metapsilosis. Protease activity was detected in 29 (37.7%) isolates of C. parapsilosis sensu stricto, whereas only 7 (9.1%) exhibited phospholipase activity. None of the C. metapsilosis or C. orthopsilosis was able to produce protease or phospholipase. Biofilm production was detected in 35 (43.2%) isolates, among which 33 were C. parapsilosis sensu stricto and 2 were C. orthopsilosis. Antifungal resistance was uncommon; only one C. metapsilosis was fluconazole resistant. However, biofilm-producing isolates showed a marked resistance to all antifungal agents tested, particularly to voriconazole. This knowledge could be of clinical relevance for guiding therapeutic decisions.

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