Multilaboratory Evaluation of In Vitro Antifungal Susceptibility Testing of Dermatophytes for ME1111
Autor: | Robert Rennie, Mahmoud A. Ghannoum, Luis Ostrosky-Zeichner, Daniel J. Diekema, Nathan P. Wiederhold, Vishnu Chaturvedi, Thomas J. Walsh, Nancy L. Wengenack, Annette W. Fothergill |
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Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
Microbiology (medical) Antifungal Susceptibility testing Antifungal Agents medicine.drug_class Epidermophyton floccosum 030106 microbiology Mycology Microbial Sensitivity Tests Trichophyton rubrum Microbiology 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine Phenols medicine Dermatomycoses Humans Trichophyton Reproducibility biology Arthrodermataceae Reproducibility of Results biology.organism_classification In vitro Pyrazoles |
Zdroj: | Journal of Clinical Microbiology. 54:662-665 |
ISSN: | 1098-660X 0095-1137 |
Popis: | ME1111 is a novel small molecule antifungal agent under development for the topical treatment of onychomycosis. Standardization of the susceptibility testing method for this candidate antifungal is needed. Toward this end, 8 independent laboratories determined the interlaboratory reproducibility of ME1111 susceptibility testing. In addition, we subsequently identified 2 strains as quality control (QC) isolates for the method. In the reproducibility study, 5 blinded clinical strains each of Trichophyton rubrum , Trichophyton mentagrophytes , and Epidermophyton floccosum were tested, while the QC study tested 6 blinded T. rubrum or T. mentagrophytes ATCC strains. Testing was performed in frozen microtiter panels according to the Clinical and Laboratory Standards Institute (CLSI) M38-A2 methodology. In the reproducibility study, 9 of 15 clinical strains showed interlaboratory agreement of >90% at the 80% inhibition endpoint, with a range of agreement of 76.2% to 100%. In the QC study, 4 of the 6 ATCC strains showed interlaboratory agreement of >90%. ME1111 demonstrated excellent interlaboratory agreement when tested against dermatophytes. Based on this data, the CLSI Subcommittee on Antifungal Susceptibility Tests approved the susceptibility testing of ME1111 against dermatophytes according to M38-A2 methodology, which stipulates RPMI 1640 as the test medium, an inoculum size of 1 to 3 × 10 3 CFU/ml, and an incubation time and temperature of 96 h at 35°C. The MIC endpoint should be 80% inhibition compared with the growth control. T. rubrum ATCC MYA-4438 and T. mentagrophytes ATCC 28185 were selected as QC isolates, with an acceptable range of 0.12 to 1 μg/ml for the two strains. |
Databáze: | OpenAIRE |
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