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M9650952.TXT
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1996-03-30
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Document 0952
DOCN M9650952
TI Comparison of two alternative microdilution procedures with the National
Committee for Clinical Laboratory Standards reference macrodilution
method M27-P for in vitro testing of fluconazole-resistant and
-susceptible isolates of Candida albicans.
DT 9505
AU Espinel-Ingroff A; Rodriguez-Tudela JL; Martinez-Suarez JV; Medical
College of Virginia, Virginia Commonwealth University,; Richmond
23298-0049, USA.
SO J Clin Microbiol. 1995 Dec;33(12):3154-8. Unique Identifier : AIDSLINE
MED/96156118
AB The National Committee for Clinical Laboratory Standards has proposed a
reference broth macrodilution method for in vitro antifungal
susceptibility testing of yeasts (the M27-P method). This method is
cumbersome and time-consuming and includes MIC endpoint determination by
the visual and subjective inspection of growth inhibition after 48 h of
incubation. Two alternative microdilution procedures for MIC endpoint
determination, a spectrophotometric MIC endpoint test that evaluates 80%
growth inhibition by the drug and a colorimetric method with an
oxidation-reduction indicator (Alamar Blue), were compared with the
M27-P method for fluconazole susceptibility testing of 45 susceptible
and resistant isolates of Candida albicans. The spectrophotometric
method was performed with RPMI 1640 medium with 2% glucose, and the
other two tests were performed with plain RPMI 1640 medium. All tests
were incubated at 35 degrees C. Excellent agreement was demonstrated
between the M27-P method and both 24-h microdilution tests (97.7%) as
well as between the two microdilution tests (95.5%). Also, there was
agreement in the detection in vivo of fluconazole resistance by the
three methods. These preliminary data indicate that both microdilution
methods may serve as less subjective alternatives to the M27-P method
for the determination of fluconazole MIC endpoints.
DE Antifungal Agents/*PHARMACOLOGY AIDS-Related Opportunistic
Infections/COMPLICATIONS/DRUG THERAPY/ MICROBIOLOGY Candida
albicans/*DRUG EFFECTS/ISOLATION & PURIF Candidiasis,
Oral/COMPLICATIONS/DRUG THERAPY/MICROBIOLOGY Colorimetry Comparative
Study Drug Resistance, Microbial Evaluation Studies
Fluconazole/*PHARMACOLOGY Human Microbial Sensitivity
Tests/*METHODS/STANDARDS Spectrophotometry Support, Non-U.S. Gov't
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).