Evaluation of the correlation of caspofungin MICs and treatment outcome in murine infections by wild type strains of Candida parapsilosis.

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Evaluation of the correlation of caspofungin MICs and treatment outcome in murine infections by wild type strains of Candida parapsilosis.

Diagn Microbiol Infect Dis. 2013 Jun 24;

Authors: Salas V, Pastor FJ, Capilla J, Sutton DA, Mayayo E, Fothergill AW, Rinaldi MG, Guarro J

Abstract
We have evaluated the in vitro activity of caspofungin against 36 wild-type strains of Candida parapsilosis sensu stricto using 3 techniques: broth microdilution, disk diffusion, and the determination of minimal fungicidal concentration (MFC). The first 2 methods showed a good in vitro activity of caspofungin, but the MFCs were ≥2 dilutions above their corresponding MICs. In a murine model of disseminated infection, we evaluated the efficacy of caspofungin at 5 mg/kg against 8 strains of C. parapsilosis representing different degrees of in vitro susceptibility (0.12-1 μg/mL). All the isolates responded to treatment and (1→3)-β-D-glucan levels were reduced in all the cases; however, the study revealed differences among isolates, since caspofungin reduced the tissue burden of mice infected with isolates with MICs ≤0.5 μg/mL but was less effective against those with MICs of 1 μg/mL.

PMID: 23806662 [PubMed - as supplied by publisher]

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