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Species identification, antifungal susceptibility profiles and biofilm formation attributes of Rhodotorula isolates from ocular infections
Ist Teil von
Mycoses, 2021-10, Vol.64 (10), p.1183-1196
Ort / Verlag
Germany: Wiley Subscription Services, Inc
Erscheinungsjahr
2021
Quelle
Wiley Online Journals
Beschreibungen/Notizen
Background
Members of genus Rhodotorula are widely distributed in nature and have been traditionally considered non‐pathogenic. Last few decades have seen the yeast as an emerging pathogen. We observed increase in numbers of Rhodotorula isolates from ocular infections in last few years, thus this prospective study was planned.
Objectives
To identify the species of Rhodotorula isolates from ocular infections.
To know the antifungal susceptibilities and study the biofilm formation attributes of the isolates.
Materials and Methods
Rhodotorula isolates were speciated using conventional methods, Matrix Assisted Laser Desorption and Ionisation – Time of Flight (MALDI‐ TOF) and sequencing of ITS region of ribosomal DNA. Antifungal susceptibility testing (AFST) was done using disc diffusion and E‐test. Biofilm formation was studied using XTT [2,3‐bis (2‐methoxy‐4‐nitro‐5‐sulfo‐phenyl)‐2H‐tetra‐zolium‐5‐carboxanilide] assay.
Results
Twenty four isolates (92.3%) were identified as R. mucilaginosa and two as R. Minuta. AFST showed high MICs against Fluconazole, Amphotericin‐B, Caspofungin, Micafungin and Flucytosine; MIC distribution from low to very high against Voriconazole, Itraconazole and Natamycin; and very low MICs against Posaconazole 57.7% of isolates were strong biofilm producers, 23.1% were moderate, and 19.2% were non producers.
Conclusions
This is the first prospective study on species distribution, antifungal susceptibility and biofilm production attributes of Rhodotorula isolates from ocular infections; also first time demonstrating the utility of proteomics based MALDI‐TOF in diagnosing Rhodotorula up to species level. The study has shown high MICs against the conventional azoles, Amphotericin‐B and Flucytosine. However, low MICs against Posaconazole and Natamycin give a hope for their possible therapeutic use.