Rev Esp Quimioter 2012:25(4):256-260

Evaluation of the Sensititre Yeast One microdilution method for susceptibility testing of Candida species to anidulafungin, caspofungin, and micafungin                    


Introduction. Echinocandins represent a new antifungal group with potent activity against Candida species. The purpose of our study was to evaluate the utility of the Sensititre Yeast One method to determine the in vitro activity of anidulafungin, micafungin, and caspofungin against Candida species isolated from clinical specimens.
Methods. A total of 131 Candida strains were tested using Sensititre Yeast One colorimetric microdilution method. They belonged to the following species: 42 C. albicans, 36 C. glabrata, 21 C. parapsilosis, 12 C. tropicalis, 10 C. krusei, 3 C. guilliermondii, 2 C. famata, 3 C. kefyr, 1 C. lusitaniae, 1 C. zeylanoides, and 1 C. lipolytica. For being considered susceptible the strains had to be inhibited by concentrations ≤2 mg/L of anidulafungin, caspofungin or micafungin.
Results. The 80.1% of the strains tested were inhibited by concentrations ≤0.25 mg/L of anidulafungin and micafungin. The activity of caspofungin was slightly lower (78.6% of strains inhibited by concentrations ≤0.25 mg/L). The 96.9% of strains turned out susceptible to concentrations ≤2 mg/L against the three echinocandins. Two strains of C. parapsilosis (9.5%), one of C. guilliermondii, and two of C. famata showed non-susceptible to one or more echinocandins.
Conclusions. In our series, anidulafungin, micafungin, and caspofungin were effective against C. albicans, C. glabrata, C. tropicalis, C. krusei, C. kefyr, C. lusitaniae and C. lipolytica. The 96.9% of strains were susceptible to all three echinocandins. Thus, echinocandins are proved to exhibit excellent activity to the Candida species most frequently involved in human infections, except Candida parapsilosis.  


Rev Esp Quimioter 2012:25(4):256-260 [pdf]