PMID: 9431939Feb 12, 1998Paper

Interpretation of trailing endpoints in antifungal susceptibility testing by the National Committee for Clinical Laboratory Standards method

Journal of Clinical Microbiology
S G RevankarT F Patterson

Abstract

Trailing endpoints remain a problem in antifungal susceptibility testing using the National Committee for Clinical Laboratory Standards (NCCLS) method. For isolates for which trailing endpoints are found, MICs of < or = 1 microg/ml at 24 h and of > 64 microg/ml at 48 h are usually observed. In a study of human immunodeficiency virus (HIV)-infected patients with oropharyngeal candidiasis, we identified three patients with multiple serial isolates for which trailing endpoints were observed with fluconazole. At 24 h, MICs were generally < or = 1 microg/ml by both broth macro- and microdilution methods. However, at 48 h, MICs were > 64 microg/ml, while the organism remained susceptible by agar dilution testing with fluconazole. Most episodes of oropharyngeal candidiasis with trailing-endpoint isolates responded to doses of fluconazole as low as 100 mg/day. Two patients had both susceptible and trailing-endpoint isolates by NCCLS broth macro- and microdilution testing; these isolates were found to be the same strain by pulsed-field gel electrophoresis using restriction fragment length polymorphisms. Another patient had two different strains, one for which trailing endpoints were observed and one which was susceptible at 48 h. Traili...Continue Reading

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Citations

Aug 25, 1999·The Journal of Antimicrobial Chemotherapy·S MaesakiS Kohno
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