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Antifungal Pharmacodynamic Characteristics of Amphotericin B against Trichosporon asahii , Using Time‐Kill Methodology
Author(s) -
Toriumi Yoshimi,
Sugita Takashi,
Nakajima Masamitsu,
Matsushima Toshiharu,
Shinoda Takako
Publication year - 2002
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.2002.tb02663.x
Subject(s) - amphotericin b , trichosporon , microbiology and biotechnology , pharmacodynamics , biology , minimum inhibitory concentration , pharmacology , antibiotics , antifungal , pharmacokinetics , yeast , biochemistry
We determined the MIC of amphotericin B against 45 Trichosporon asahii isolates from various clinical and environmental sources, and used in vitro time‐kill methods to characterize the relationship between amphotericin B concentrations and MIC for four representative T. asahii isolates. Amphotericin B had concentration‐dependent antifungal activity. MICs ranged from 0.5 to 16 μg/ml, and most T. asahii isolates (76%, 34/45) were inhibited at safely achievable amphotericin B serum concentrations (≤ 2 μg/ml). However, 40% (18/45) of isolates were not killed at these concentrations (MFCs from 1.0 to 32 μg/ml). At concentrations ≥ 2 × MIC, amphotericin B exhibited fungicidal activity (< 99.9% reduction in CFU) over a 12‐hr time‐period; the maximal effect was achieved at ≥ 4 × MIC. Susceptibility testing confirmed the resistance of T. asahii to amphotericin B, and in vitro pharmacodynamic results also suggest that amphotericin B is not suitable therapy for T. asahii infection.