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Journal of Clinical Microbiology, 04 1995, 915-917, Vol 33, No. 4
RN Tiballi, X He, LT Zarins, SG Revankar and CA Kauffman
We examined the reliability and accuracy of a colorimetric assay using
Alamar Blue reagent in the performance of susceptibility tests for Candida
albicans. We compared the broth macrodilution method recommended by the
National Committee for Clinical Laboratory Standards (NCCLS) with a
macrodilution method modified with the Alamar reagent and a microdilution
method modified with the Alamar reagent. The MICs of fluconazole and
itraconazole for 97 isolates of C. albicans and 3 control isolates were
tested. For fluconazole, the Alamar-modified broth macrodilution method
yielded 94% (91 of 97) concordance within 2 dilutions compared with the
NCCLS method, while the microdilution method yielded 95% (92 of 97)
concordance. With Alamar-modified methods for itraconazole, broth
macrodilution yielded 97% (94 of 97) concordance within 2 dilutions. MICs
obtained by the microdilution method, although tightly nested, were shifted
to a higher value when compared with those obtained by the NCCLS method;
there was only 77% (75 of 97) concordance within 2 dilutions but 97%
concordance (94 of 97) within 3 dilutions. Tests by all methods with
quality control strains showed excellent reproducibilities. For
fluconazole, the methods modified with the Alamar reagent yielded clear
endpoints and excellent correlation for the broth macrodilution and
microdilution methods. For itraconazole, the methods modified with the
Alamar reagent yielded clear endpoints and were reproducible, but higher
MICs were obtained by the microdilution methods compared with those
obtained by the NCCLS methods.
Copyright © 1995 by the American Society for Microbiology. All rights reserved.
Use of a colorimetric system for yeast susceptibility testing
Department of Internal Medicine, Veterans Affairs Medical Center, Ann Arbor, Michigan, USA.
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