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  • In vitro activities of amphotericin B deoxycholate and liposomal amphotericin B against 604 clinical yeast isolates.

In vitro activities of amphotericin B deoxycholate and liposomal amphotericin B against 604 clinical yeast isolates.

Journal of medical microbiology (2014-09-12)
Maria Teresa Montagna, Grazia Lovero, Caterina Coretti, Osvalda De Giglio, Domenico Martinelli, Andrea Bedini, Mario Delia, Antonio Rosato, Mauro Codeluppi, Giuseppina Caggiano
ABSTRACT

We determined the in vitro antifungal activity of liposomal amphotericin B (L-AmB) against 604 clinical yeast isolates. Amphotericin B deoxycholate (D-AmB) was tested in parallel against all the isolates. Susceptibility testing was performed according to the Clinical and Laboratory Standards Institute (CLSI) M27-A3 method. Overall, L-AmB was highly active against the isolates (mean MIC, 0.42 µg ml(-1); MIC90, 1 µg ml(-1); 97.2 % of MICs were ≤1 µg ml(-1)) and comparable to D-AmB (mean MIC, 0.48 µg ml(-1); MIC90, 1 µg ml(-1); 97.3 % of MICs were ≤1 µg ml(-1)). The in vitro activity of D-AmB and L-AmB was correlated (R(2) = 0.61; exp(b), 2.3; 95 % CI, 2.19-2.44, P<0.001). Candida albicans (mean MICs of D-AmB and L-AmB, 0.39 µg ml(-1) and 0.31 µg ml(-1), respectively) and Candida parapsilosis (mean MICs of D-AmB and L-AmB, 0.38 µg ml(-1) and 0.35 µg ml(-1), respectively) were the species most susceptible to the agents tested, while Candida krusei (currently named Issatchenkia orientalis) (mean MICs of D-AmB and L-AmB, 1.27 µg ml(-1) and 1.13 µg ml(-1), respectively) was the least susceptible. The excellent in vitro activity of L-AmB may have important implications for empirical treatment approaches and support its role in treatment of a wide range of invasive infections due to yeasts.

MATERIALS
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