posaconazole and isavuconazole

The in vitro activities of eight antifungal drugs against clinical isolates of Fonsecaea pedrosoi (n = 21), Fonsecaea monophora (n = 25), and Fonsecaea nubica (n = 9) were tested. The resulting MIC(90)s for all strains (n = 55) were as follows, in increasing order: posaconazole, 0.063 microg/ml; itraconazole, 0.125 microg/ml; isavuconazole, 0.25 microg/ml; voriconazole, 0.5 microg/ml; amphotericin B, 2 microg/ml; caspofungin, 2 microg/ml; anidulafungin, 2 microg/ml; and fluconazole, 32 microg/ml.

Topics: Amphotericin B; Anidulafungin; Antifungal Agents; Ascomycota; Caspofungin; Chromoblastomycosis; Drug Resistance, Fungal; Echinocandins; Fluconazole; Humans; In Vitro Techniques; Itraconazole; Lipopeptides; Microbial Sensitivity Tests; Nitriles; Pyridines; Pyrimidines; Triazoles; Voriconazole

We compared the in vitro activities of isavuconazole, posaconazole, voriconazole, and fluconazole against Dipodascus capitatus (n = 21), Saccharomyces cerevisiae (n = 20), Rhodotorula mucilaginosa (n = 18), and Trichosporon spp. (n = 15). The MIC(50)s, MIC(90)s, and MIC ranges (in microg/ml) obtained using the CLSI M27-A3 procedure were as follows: isavuconazole, 0.125, 0.5, and < or = 0.015 to 2; posaconazole, 0.5, 2, and < or = 0.015 to > 16; voriconazole, 0.125, 2, and < or = 0.015 to 8; and fluconazole, 4, > 128, and < or = 0.125 to > 128. Isavuconazole showed potent activity against the isolates studied.

Topics: Antifungal Agents; Dipodascus; Fluconazole; Microbial Sensitivity Tests; Nitriles; Pyridines; Pyrimidines; Rhodotorula; Saccharomyces cerevisiae; Triazoles; Trichosporon; Voriconazole

We measured antifungal activity against 128 cryptococcal isolates (86 of C. neoformans and 42 of C. gattii) to determine if differences in serotype susceptibility exist. Contrary to previous results, we found no serotype susceptibility differences. Isavuconazole, posaconazole, and voriconazole demonstrated excellent potency against each isolate and serotype, including isolates with reduced fluconazole susceptibilities.

Topics: Antifungal Agents; Cryptococcus; Cryptococcus neoformans; Fluconazole; Microbial Sensitivity Tests; Nitriles; Pyridines; Pyrimidines; Serotyping; Triazoles; Voriconazole

We evaluated the MICs of isavuconazole (ISAV) against 96 isolates of Aspergillus species and 36 zygomycetes according to the methodology of the European Committee on Antimicrobial Susceptibility Testing. In addition, the in vitro activity was obtained for hyphal inocula. ISAV exhibited good antifungal activity against the tested isolates with the exception of Aspergillus niger and Mucorales. The in vitro activity of ISAV was comparable to that of voriconazole aside from Mucorales.

Topics: Antifungal Agents; Aspergillus; Microbial Sensitivity Tests; Mucorales; Nitriles; Pyridines; Triazoles

Cuban Cryptococcus isolates (n = 165) were tested in vitro against amphotericin B, flucytosine, fluconazole, itraconazole, voriconazole, posaconazole, and isavuconazole, giving MIC90 values of 0.25, 8, 4, 0.25, 0.125, 0.016, and 0.016 microg/ml, respectively. Isavuconazole and posaconazole seem to be potentially active drugs for treating cryptococcal infections.

Topics: Antifungal Agents; Azoles; Cryptococcosis; Cryptococcus neoformans; Cuba; Humans; Microbial Sensitivity Tests; Nitriles; Pyridines; Triazoles