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In Vitro Activity of Caspofungin (MK-0991) against Candida albicans Clinical Isolates Displaying Different Mechanisms of Azole Resistance

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American Society for Microbiology
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PMC
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Abstract

Caspofungin inhibits the synthesis of 1,3-β-d-glucan, a key step in fungal cell wall biosynthesis. Here we report on its potent in vitro activity (MIC at which 90% of the isolates tested are inhibited = 1 μg per ml of RPMI medium) against 32 Candida albicans fluconazole-susceptible and -resistant clinical isolates irrespective of the underlying resistance mechanism (alterations in ERG11 and/or upregulation of MDR and CDR genes encoding efflux pumps) and provide further evidence that caspofungin is not a substrate for multidrug transporters.

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