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Published on: May 28, 2014
Direct Identification of Yeasts from Blood Cultures and Body Fluids Using MALDI-TOF MS with Concurrent Antifungal
Arpita Khamrai1, Snigdha Reddy1, Saikat Paul1,2
1Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India.
Abstract:
The rising incidence of invasive fungal infections has been accompanied by an increasing prevalence of antifungal resistance among fungal pathogens. Rapid identification of causative agents and their antifungal susceptibility profiles is critical for initiating timely, species-specific targeted therapy. In this context, we evaluated a MALDI-TOF MS-based method for the rapid identification of clinically relevant yeast species directly from blood cultures and body fluids, coupled with direct antifungal susceptibility testing (Direct-AFST). Our study evaluated over 700 yeast isolates, encompassing diverse Candida and non-Candida species, using MALDI-TOF MS. Additionally, antifungal susceptibility was assessed for 250 isolates, demonstrating excellent categorical agreement between Direct-AFST and conventional culture-based AFST (Culture-AFST). Our findings highlight the clinical utility of MALDI-TOF MS for accurate and rapid yeast identification directly from positive blood cultures, irrespective of microbial load or sample preparation method. Furthermore, the successful application of Direct-AFST underscores its potential for early detection of antifungal resistance, significantly reducing diagnostic turnaround times and improving patient management.
Insights
Rapidly identifying fungal infections using MALDI-TOF MS and direct antifungal susceptibility testing (Direct-AFST) improves patient care. This method accurately detects yeast species and resistance, enabling faster, targeted antifungal therapy.
Area of Science:
- Clinical Microbiology
- Infectious Diseases
- Diagnostic Technology
Background:
- Invasive fungal infections are increasing, alongside antifungal resistance.
- Timely, targeted antifungal therapy requires rapid pathogen identification and susceptibility testing.
- Current methods can be time-consuming, delaying appropriate treatment.
Purpose of the Study:
- To evaluate a MALDI-TOF MS-based method for rapid yeast identification from clinical samples.
- To assess the performance of direct antifungal susceptibility testing (Direct-AFST) coupled with MALDI-TOF MS.
- To determine the clinical utility of this combined approach for improving patient management.
Main Methods:
- MALDI-TOF MS was used to identify over 700 yeast isolates from blood cultures and body fluids.
- Direct-AFST was performed on 250 isolates and compared to conventional culture-based AFST (Culture-AFST).
- Evaluation included diverse Candida and non-Candida species, assessing method performance across different sample types.
Main Results:
- MALDI-TOF MS provided accurate and rapid yeast identification directly from positive blood cultures.
- Direct-AFST demonstrated excellent categorical agreement with Culture-AFST.
- The combined method proved effective irrespective of microbial load or sample preparation.
Conclusions:
- MALDI-TOF MS is clinically valuable for rapid yeast identification from blood cultures.
- Direct-AFST shows significant potential for early antifungal resistance detection.
- This integrated approach can substantially reduce diagnostic turnaround times, optimizing patient management.
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