Evaluation of a flow cytofluorometric method for rapid determination of amphotericin B susceptibility of yeast isolates.

Abstract:

:A rapid-flow cytofluorometric susceptibility test for in vitro amphotericin B testing of yeasts was evaluated and compared to the National Committee for Clinical Laboratory Standards (NCCLS) M27-T reference broth macrodilution method. The flow cytofluorometric method is based on the detection of decreased green fluorescence intensity of cells stained with DiOC5(3), a membrane potential-sensitive cationic dye, after drug treatment. Testing was performed on 134 clinical isolates (Candida spp. and Torulopsis glabrata). From the dose-response curve obtained for each isolate, three endpoints were calculated by computer analysis (the concentrations at which the fluorescence intensity was reduced by 50, 80, and 90%, i.e., 50% inhibitory concentration [IC50], IC80, and IC90, respectively). A regression analysis correlating these endpoints with the M27-T MICs showed that the best agreement was obtained with IC80. The flow cytofluorometric method showed good reproducibility with control strains. These initial results suggest that the flow cytofluorometric method is a valid alternative to the NCCLS reference method.

authors

Peyron F,Favel A,Guiraud-Dauriac H,El Mzibri M,Chastin C,Dumenil G,Regli P

doi

10.1128/AAC.41.7.1537

subject

Has Abstract

pub_date

1997-07-01 00:00:00

pages

1537-40

issue

7

eissn

0066-4804

issn

1098-6596

journal_volume

41

pub_type

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