Section 4
Chapter 3,689

Comparison of the Sensititre YeastOne colorimetric antifungal panel and Etest with the NCCLS M38-A method to determine the activity of amphotericin B and itraconazole against clinical isolates of Aspergillus spp

Martín-Mazuelos, E.; Pemán, J.; Valverde, A.; Chaves, M.ón.; Serrano, M.C.; Cantón, E.

Journal of Antimicrobial ChemoTherapy 52(3): 365-370


ISSN/ISBN: 0305-7453
PMID: 12917236
DOI: 10.1093/jac/dkg384
Accession: 003688364

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The evaluation of the Sensititre YeastOne and Etest methods for determining susceptibility to amphotericin B and itraconazole by comparing the MICs obtained by these methods at different times of reading with those of the M38-A broth microdilution method. Sixty-three clinical isolates of Aspergillus spp. (23 Aspergillus flavus, 24 Aspergillus fumigatus, nine Aspergillus niger, three Aspergillus glaucus, two Aspergillus terreus and two Aspergillus flavipes) were assayed. Two itraconazole-resistant strains (NCPF7100 and 7099) were also included. Itraconazole MICs for the two resistant strains were >4 mg/L by the three methods. The overall agreement (+/-2 log2) between M38-A (48 h) and colorimetric (48 h) method was 93.4% for amphotericin B and 90.2% for itraconazole. By the Etest, the best agreement with M38-A was obtained when readings were made at 24 h: 88.5% for amphotericin B and 67.2% for itraconazole. Etest MICs were higher for all species except A. niger. The colorimetric method appears to be a suitable alternative procedure for antifungal susceptibility testing of Aspergillus spp. and is able to detect resistance to itraconazole. The range of MICs for amphotericin B by Etest is wider and for some strains is >16 mg/L, suggesting that this method could be useful for detecting resistant strains as occur in yeasts.

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