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A new method combining automatic turbidimetry and sequential viable count determinations was developed to evaluate the in vitro activity of various antifungal agents alone and in combination against three clinical isolates of Candida spp. (two Candida albicans and one C. tropicalis) at two inocula (10(-5) and 10(-6) CFU/ml). Specific parameters were derived from the time-kill curves: the maximal rate of killing, the lowest biomass, and the overnight biomass. Their intra-assay and between-assay reproducibilities were high, with respective standard deviations of 0.4 and 0.25 to 1.4 log CFU/ml. Amphotericin B alone showed a linear relationship between rate of killing or lowest biomass and the log of concentration from 0.03 to 4 mg/liter that was similar for the three strains tested. 5-Fluorocytosine (flucytosine) alone showed a dose-related reduction of overnight biomass for concentrations up to 8 mg/liter with no further increase at higher concentrations for one strain of C. albicans and a paradoxical decrease for one strain of C. tropicalis. Ketoconazole alone was found to be only fungistatic with no increased activity at concentrations up to 16 mg/liter. Amphotericin B plus flucytosine interacted synergistically in 46 to 60% of the combinations tested against C. tropicalis depending on the initial inoculum. Indifference was observed for the two strains of C. albicans. Amphotericin B or flucytosine plus ketoconazole was usually indifferent against the three tested strains.

antimicrobial agents and chemotherapy

In vitro evaluation of various antifungal agents alone and in combination by using an automatic turbidimetric system combined with viable count determinations