Comparative In Vitro Activities of Fluconazole, Voriconazole, and MXP-4509 Against Romanian Blood Yeast Isolates

The aim of the study was to evaluate the antifungal activity of a new triazole formulation against 182 clinical isolates of yeasts recovered from blood cultures in three tertiary hospitals in Romania and to compare its activity with those of fluconazole and voriconazole. In vitro susceptibility was assessed by following the guidelines of AFST-EUCAST E. Def. 7.1. The distribution of minimum inhibitory concentrations (MICs) of MXP-4509 was very similar to that of voriconazole (MIC 50 : 0.0312 mg/l vs. 0.0156 mg/l; MIC 90 : 0.25 mg/l vs. 0.25 mg/l), but significantly different from that of fluconazole (MIC 50 : 0.0312 mg/l vs. 0.5 mg/l; MIC 90 : 0.25 mg/l vs. 32 mg/l). The new triazole MXP-4509 proved to have a good in vitro antifungal activity raising the interest for further pharmacological and microbiological investigations in order to assess its potential advantages for therapy.