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Increase in Resistance to Fluconazole and Itraconazole in Trichophyton rubrum Clinical Isolates by Sequential Passages In Vitro under Drug Pressure

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Abstract

Trichophyton rubrum, an anthropophilic dermatophyte fungus, is the predominant causative agent of superficial skin infections in human population. There are only scanty reports on drug susceptibility profiling of T. rubrum. Neither mechanisms for drug resistance development nor correlation between in vitro drug susceptibility and in vivo response to treatment is known for that species. In this study, changes in the in vitro susceptibilities to fluconazole (FLZ) and itraconazole (ITZ) among thirty T. rubrum clinical strains subjected to sequential passages in the presence or absence of the azoles were investigated. Each strain was passaged 12 times at 4-week intervals as three parallel cultures, maintained on a drug-free medium (1), and a medium containing FLZ (2) or ITZ (3) at subinhibitory concentrations. Susceptibility to FLZ and ITZ of the original strain and its 3 subcultures was determined by microdilution method. The MIC values of the two azoles remained unaltered for all T. rubrum strains tested, after 12 passages on a drug-free medium. Among the strains grown with FLZ, an increase in the MICs of FLZ and ITZ was noted in 17 (56.7 %) and 19 (63.3 %) strains, respectively. Increased MICs of ITZ and FLZ were demonstrated for 24 (80 %) and 20 (66.7 %) strains that were propagated with ITZ. The results indicate the capacity of T. rubrum to develop resistance toward the azoles after prolonged exposure to these drugs. Resistance of T. rubrum to azoles plays an important role in therapy failures and consequently contributes to persistence and chronicity of the infections.

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Authors and Affiliations

  1. Department of Dermatology, Venereology and Allergology, Wrocław Medical University, Wrocław, Poland

    Anita Hryncewicz-Gwóźdź, Katarzyna Kalinowska & Ewa Plomer-Niezgoda

  2. Department of Applied Microbiology, Faculty of Biology, Institute of Microbiology, University of Warsaw, 1, I. Miecznikowa, 02-096, Warsaw, Poland

    Jacek Bielecki & Tomasz Jagielski

Authors
  1. Anita Hryncewicz-Gwóźdź
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  2. Katarzyna Kalinowska
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  3. Ewa Plomer-Niezgoda
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  4. Jacek Bielecki
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  5. Tomasz Jagielski
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Correspondence to Tomasz Jagielski.

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Hryncewicz-Gwóźdź, A., Kalinowska, K., Plomer-Niezgoda, E. et al. Increase in Resistance to Fluconazole and Itraconazole in Trichophyton rubrum Clinical Isolates by Sequential Passages In Vitro under Drug Pressure. Mycopathologia 176, 49–55 (2013). https://doi.org/10.1007/s11046-013-9655-y

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  • DOI: https://doi.org/10.1007/s11046-013-9655-y

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