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Comparative Study
. 2002 Sep;46(9):3084-7.
doi: 10.1128/AAC.46.9.3084-3087.2002.

Comparative evaluation of disk diffusion with microdilution assay in susceptibility testing of caspofungin against Aspergillus and Fusarium isolates

Sevtap Arikan  1 , Victor Paetznick, John H Rex
Affiliations
Comparative Study

Comparative evaluation of disk diffusion with microdilution assay in susceptibility testing of caspofungin against Aspergillus and Fusarium isolates

Sevtap Arikan et al. Antimicrob Agents Chemother. 2002 Sep.

Abstract

We compared the disk diffusion and broth microdilution methods for susceptibility testing of caspofungin against Aspergillus (n = 78) and Fusarium (n = 22) isolates. Microdilution testing followed the NCCLS M-38P guidelines but was performed in antibiotic medium 3 supplemented to 2% glucose (AM3). Disk diffusion assays were performed on AM3 agar plates with a 2- micro g caspofungin disk. By both methods, caspofungin showed favorable activity against Aspergillus isolates and no activity against Fusarium isolates. In the disk-based format, intrazonal growth that was not influenced by the drug concentration gradient was consistently observed for all of the Aspergillus isolates tested.

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Figures

FIG. 1.
FIG. 1.
Aspergillus growth pattern obtained by the disk diffusion test method. Note the clear zone edges and the microcolonies inside the IZ. The disk contained 2 μg of caspofungin.
See this image and copyright information in PMC

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