Interaction between Fluconazole and Amphotericin B in Mice with Systemic Infection Due to Fluconazole-Susceptible or -Resistant Strains of Candida albicans

Author:

Louie Arnold12,Banerjee Partha12,Drusano George L.13,Shayegani Mehdi2,Miller Michael H.13

Affiliation:

1. Division of Infectious Diseases1 and

2. Wadsworth Center, New York State Department of Health, Albany, New York 122012

3. Clinical Pharmacology,3 Department of Medicine, Albany Medical College, Albany, New York 12208, and

Abstract

ABSTRACT The interaction between fluconazole (Flu) and amphotericin B (AmB) was evaluated in a murine model of systemic candidiasis for one Flu-susceptible strain (MIC, 0.5 μg/ml), two strains with intermediate Flu resistance (Flu mid-resistant strains) (MIC, 64 and 128 μg/ml), and one highly Flu-resistant strain (MIC, 512 μg/ml) of Candida albicans . Differences in fungal densities in kidneys of infected mice after 24 h of therapy and in survival rates at 62 days of mice treated with an antifungal drug or a combination of antifungal drugs for 4 days were compared. For the Flu-susceptible and Flu mid-resistant strains, the combination of Flu and AmB was antagonistic, as shown by both quantitative culture results and survival. The interaction was additive for the highly Flu-resistant strain. These results suggest that the combination of Flu and AmB should be used with caution in infections due to fungi that are usually susceptible to both antifungal agents and as empirical antifungal drug therapy.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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