Direct In Vitro Comparison of the Prodrug Isavuconazonium Sulfate with the Isavuconazole Active Compound Against Aspergillus spp. and 2 Rare Moulds

Isavuconazonium sulfate is a prodrug of isavuconazole, a broad-spectrum mould-active triazole antifungal drug. We provide a direct comparison of the in vitro activity of the prodrug versus the active metabolite against clinical isolates of Aspergillus spp., Sarocladium kiliense, and Scedosporium apiospermum using CLSI broth microdilution methods. The MIC values obtained for the prodrug were one 2-fold dilution higher than those of isavuconazole for all isolates tested. Using previously defined epidemiological cutoff values for isavuconazole and Aspergillus spp., 96.4% of isolates were wild type (WT) to isavuconazole and only 75% were WT to the prodrug.
Source: Diagnostic Microbiology and Infectious Disease - Category: Microbiology Authors: Source Type: research