Emergence of a Candida krusei isolate with reduced susceptibility to caspofungin during therapy

Clinical failure associated with reduced susceptibility to caspofungin has been described in Candida albicans and C parapsilosis. We report a case of Candida krusei infection that progressed despite caspofungin therapy. Reduced microbial susceptibility to all three echinocandins (caspofungin, anidulafungin, and micafungin) was noted but was not associated with mutations in FKS1.