Effect of increasing inoculum sizes of pathogenic filamentous fungi on MICs of antifungal agents by broth microdilution method

A. Gehrt, J. Peter, P. A. Pizzo, T. J. Walsh

Research output: Contribution to journalArticlepeer-review

Abstract

Inoculum size is a critical variable in development of methods for antifungal susceptibility testing for filamentous fungi. In order to investigate the influence of different inoculum sizes on MICs of amphotericin B, 5-fluorocytosine, itraconazole, and miconazole, 32 clinical isolates (8 Aspergillus fumigatus, 8 Aspergillus flavus, 5 Rhizopus arrhizus, 8 Pseudallescheria boydii, and 3 Fusarium solani isolates) were studied by the broth microdilution method. Four inoculum sizes were studied: 1 x 102 to 5 x 102, 1 x 103 to 5 x 103, 1 x 104 to 5 x 104, and 1 x 105 to 5 x 105 CFU/ml. The National Committee for Clinical Laboratory Standards reference method for antifungal susceptibility testing in yeasts was modified and applied to filamentous fungi. The inoculum was spectrophotometrically adjusted, and all tests were performed in buffered medium (RPMI 1640) at pH 7.0 with incubation at 35°C for 72 h. MICs were read at 24, 48, and 72 h. Amphotericin B showed a minimum effect of inoculum size on MICs for all species with the exception of P. boydii (P < 0.05). A significant effect of inoculum size on MICs was observed with 5-fluorocytosine, for which there was an increase of more than 10-fold in MICs against all Aspergillus spp. between inoculum concentrations of 102 and 104 CFU/ml (P < 0.001). For itraconazole, the results showed a more species-dependent increase of MICs, most strikingly for R. arrhizus and P. boydii. Miconazole, which was tested only with P. boydii, did not demonstrate a significant effect of inoculum size on MICs. In summary, the effect of inoculum size on MICs for filamentous fungi was dependent upon the organism and antifungal compound tested. Thus, among antifungal compounds, itraconazole and 5-fluorocytosine demonstrated significant inoculum effects, while amphotericin B and miconazole showed comparatively minimum inoculum effects against pathogenic filamentous fungi. Moreover, among filamentous fungi, P. boydii and R. arrhizus exhibited the greatest inoculum effect.

Original languageEnglish (US)
Pages (from-to)1302-1307
Number of pages6
JournalJournal of clinical microbiology
Volume33
Issue number5
DOIs
StatePublished - 1995

ASJC Scopus subject areas

  • Microbiology (medical)

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