Subculture on potato dextrose agar as a complement to the broth microdilution assay for Malassezia pachydermatis

J Microbiol Methods. 2008 Oct;75(2):341-3. doi: 10.1016/j.mimet.2008.05.022. Epub 2008 Jul 7.

Abstract

The main aim of this study was to verify the efficacy of subculture on potato dextrose agar (PDA) as a complement to the in vitro susceptibility test for Malassezia pachydermatis strains by a broth microdilution method, as well as to determine the MIC and MFC of azole derivatives, amphotericin B and caspofungin. The microdilution assay was performed in 96-well plates using a modified RPMI 1640 medium. The M. pachydermatis strains were resistant to caspofungin. All strains (n=50) had shown MIC values of <0.03, <0.03, 2.0, 4.0 and 4.0 microg/ml for itraconazole, ketoconazole, voriconazole, fluconazole and amphotericin B, respectively. Thus, the subculture on PDA improved the analysis of the in vitro antifungal susceptibility of M. pachydermatis.

Publication types

  • Evaluation Study

MeSH terms

  • Agar*
  • Amphotericin B / pharmacology
  • Animals
  • Antifungal Agents / pharmacology*
  • Azoles / pharmacology
  • Caspofungin
  • Culture Media
  • Dermatomycoses / microbiology
  • Dermatomycoses / veterinary
  • Dog Diseases / microbiology
  • Dogs
  • Echinocandins / pharmacology
  • Glucose*
  • Lipopeptides
  • Malassezia / drug effects*
  • Malassezia / growth & development*
  • Malassezia / isolation & purification
  • Microbial Sensitivity Tests
  • Microbiological Techniques
  • Solanum tuberosum*

Substances

  • Antifungal Agents
  • Azoles
  • Culture Media
  • Echinocandins
  • Lipopeptides
  • Amphotericin B
  • Agar
  • Caspofungin
  • Glucose