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  • Title: Turbidimetric and visual criteria for in vitro susceptibility testing of Cryptococcus neoformans clinical isolates.
    Author: Del Poeta M, Barchiesi F, Arzeni D, Marinucci G, Scalise G.
    Journal: Mycoses; 1994; 37(11-12):411-6. PubMed ID: 7659128.
    Abstract:
    The drug concentration which inhibited 50% of growth (IC50), the lowest drug concentration at which growth was less than 30% of that in a positive control well (IC30), the visual minimal inhibitory concentration (MIC visual), were applied to study the effects of fluconazole, itraconazole, amphotericin B and flucytosine against 27 isolates of Cryptococcus neoformans by a broth microdilution technique. When the recommendations established by NCCLS Subcommittee on Antifungal Susceptibility Test were applied for the visual reading of the microplates, the results were comparable with those obtained by the turbidimetric method. No statistically significant differences between MIC visual and IC30 readings were observed with the azoles. There were, however, differences with amphotericin B and flucytosine. In absolute terms MICs of amphotericin B and flucytosine showed higher values than IC30s and IC50s.
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