Determination of susceptibility/resistance to antifungal drugs of Trichophyton mentagrophytes isolates by a macrodilution method.
Onychomycosis is a common adult human mycosis, and dermatophytes of the Trichophyton genera are the most frequently isolated microorganism. Globally, from 3% to 10% of the human population is attacked by ony cho mycosis, and many cases involve toenails. The aim of this work was to determine the minimal inhibitory concentrations (MICs) of antifungal drugs (fluconazole, ketoconazole, itraconazole, terbinafine, and griseofulvin) often used for the treatment of ungueal dermatophytosis caused by Trichophyton mentagrophytes. The MICs were determined by the broth medium macrodilution method. The results showed that activities of terbinafine and itraconazole were significantly higher (MIC <0.007-0.015 microg.mL -1 and MIC = 0.062-1.000 microg.mL -1, respectively). All isolates had reduced susceptibility to fluconazole (MIC = 16 to >64 microg.mL -1). The MICs of ketoconazole and griseofulvin varied among strains, ranging from 0.125 to 2.000 microg.mL -1 for ketoconazole and from 0.25 to 2.00 microg.mL -1 for griseofulvin. These MICs were higher than those of other studies cited, possibly because of differences in culture medium used in the other studies.
Barros
Maria Elisabete da Silva
ME
Dept. of Microbiology, Institute of Biological Sciences, Federal University of Minas Gerais, Av. Antonio Carlos 6627, PO Box 486, CEP: 31.270-901, Belo Horizonte, Minas Gerais, Brazil. betebarros@ef.ufop.br
Hamdan
Júnia Soares
JS
D000935:Antifungal Agents / Q000494:pharmacology*; D006801:Humans; D008826:Microbial Sensitivity Tests / Q000379:methods; D014009:Onychomycosis / Q000382:microbiology*; D014249:Trichophyton / Q000187:drug effects* / Q000302:isolation & purification
D000935:Antifungal Agents