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


Arikan S., Paetznick V., Rex J.

ANTIMICROBIAL AGENTS AND CHEMOTHERAPY, vol.46, no.9, pp.3084-3087, 2002 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 9
  • Publication Date: 2002
  • Doi Number: 10.1128/aac.46.9.3084-3087.2002
  • Title of Journal : ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
  • Page Numbers: pp.3084-3087

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-mug 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.