Effect of pH on the in vitro activities of amphotericin B, itraconazole, and flucytosine against Aspergillus isolates.
The in vitro susceptibilities of 21 Aspergillus isolates were tested against three antifungal agents in RPMI 1640 and yeast nitrogen base at pH 5.0 and 7.0 by a broth microdilution format of the NCCLS method. The MICs of amphotericin B and itraconazole were higher, while those of flucytosine were lower, at pH 5.0 than at pH 7.0. The poor correlation between in vitro results and clinical outcome could be due to a difference in pH between the in vitro susceptibility test and at the site of infection.
Department of Medical Microbiology and Infectious Diseases, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands.
D T A
DT
Te Dorsthorst
J W
JW
Mouton
C J P
CJ
van den Beukel
H A L
HA
van der Lee
J F G M
JF
Meis
P E
PE
Verweij
D000666:Amphotericin B / Q000494:pharmacology*; D000935:Antifungal Agents / Q000494:pharmacology*; D001228:Aspergillosis / Q000382:microbiology; D001230:Aspergillus / Q000187:drug effects*; D002175:Candida / Q000187:drug effects; D005437:Flucytosine / Q000494:pharmacology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017964:Itraconazole / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests
D000935:Antifungal Agents; D017964:Itraconazole; D000666:Amphotericin B; D005437:Flucytosine