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Chadwick SG, Schuyler JA, Vermitsky JP, Adelson ME, Mordechai E, Gygax SE. X-Plate Technology: a new method for detecting fluconazole resistance in Candida species. J Med Microbiol 2013; 62:720-726. [DOI: 10.1099/jmm.0.054445-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Candida species are responsible for many opportunistic fungal infections. Fluconazole is a well-tolerated antifungal drug, commonly used in the treatment of candidiasis. However, with fluconazole resistance ever increasing, rapid detection and antifungal susceptibility testing of Candida is imperative for proper patient treatment. This paper reports a cost-effective, simple and rapid chromogenic agar dilution method for simultaneous Candida species identification and fluconazole susceptibility testing. The results obtained by X-Plate Technology were in absolute concordance with standard microbroth dilution assays. Analysis of 1383 clinical patient samples with suspected vulvovaginal candidiasis revealed that this technology was able to detect and speciate the Candida isolate and determine the fluconazole susceptibility. The prevalence and susceptibility profiles of the clinical isolates using this method were highly similar to published reports using the microbroth dilution method.
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Affiliation(s)
- Sean G. Chadwick
- Femeris Women’s Health Research Center, Medical Diagnostic Laboratories, LLC, A Member of Genesis Biotechnology Group, 2439 Kuser Road, Hamilton, NJ 08690, USA
| | - Jessica A. Schuyler
- Femeris Women’s Health Research Center, Medical Diagnostic Laboratories, LLC, A Member of Genesis Biotechnology Group, 2439 Kuser Road, Hamilton, NJ 08690, USA
| | - John-Paul Vermitsky
- Femeris Women’s Health Research Center, Medical Diagnostic Laboratories, LLC, A Member of Genesis Biotechnology Group, 2439 Kuser Road, Hamilton, NJ 08690, USA
| | - Martin E. Adelson
- Femeris Women’s Health Research Center, Medical Diagnostic Laboratories, LLC, A Member of Genesis Biotechnology Group, 2439 Kuser Road, Hamilton, NJ 08690, USA
| | - Eli Mordechai
- Femeris Women’s Health Research Center, Medical Diagnostic Laboratories, LLC, A Member of Genesis Biotechnology Group, 2439 Kuser Road, Hamilton, NJ 08690, USA
| | - Scott E. Gygax
- Femeris Women’s Health Research Center, Medical Diagnostic Laboratories, LLC, A Member of Genesis Biotechnology Group, 2439 Kuser Road, Hamilton, NJ 08690, USA
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Noake T, Kuriyama T, White PL, Potts AJC, Lewis MAO, Williams DW, Barnes RA. Antifungal susceptibility of Candida species using the Clinical and Laboratory Standards Institute disk diffusion and broth microdilution methods. J Chemother 2007; 19:283-7. [PMID: 17594923 DOI: 10.1179/joc.2007.19.3.283] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
There are conflicting reports on the agreement between the Clinical and Laboratory Standards Institute disk diffusion (M44-A) and reference broth microdilution (M27-A) methods for determination of antifungal susceptibility of yeasts. The antifungal susceptibility of 541 yeasts, the majority of which were from the oral cavity, was determined using these two methods and the accuracy of the disk diffusion method assessed for clinical testing of various Candida species. Of the strains tested, Candida albicans predominated (390 out of 541). The classification of susceptibility determined by the disk diffusion method was largely in concordance with that obtained using the broth dilution method, regardless of species within Candida genus. The overall observed agreement between these two methods was 94.7% for fluconazole and 96.7% for voriconazole was with a 'very major' discrepancy level of 1.5% and 1.7% respectively. This study demonstrates a strong agreement of the simple disk diffusion method with the more labour intensive 'gold standard' broth microdilution method. These findings would support the use of the disk diffusion method in a routine mycology service.
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Affiliation(s)
- T Noake
- Department of Medical Microbiology, amd NPHS Cardiff, University Hospital of Wales, Cardiff, UK
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