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In vitro susceptibility and multilocus sequence typing of Fusarium isolates causing keratitis.

P Dallé da Rosa1, A Nunes2, R Borges2

  • 1Programa de Pós-graduação em Medicina: Ciências Médicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.

Journal De Mycologie Medicale
|May 22, 2018
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Summary
This summary is machine-generated.

Molecular identification of Fusarium species causing fungal keratitis in Brazil revealed Fusarium solani and Fusarium oxysporum complexes. Amphotericin B and natamycin showed the highest antifungal effectiveness against these serious eye infections.

Keywords:
Antifungal resistanceEpidemiologyFungal keratitisFusariumRPB2TEF1

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Area of Science:

  • Ophthalmology
  • Mycology
  • Molecular Biology

Background:

  • Fungal keratitis is a major cause of vision loss, particularly in developing nations.
  • Accurate identification of fungal pathogens is crucial for effective treatment of fungal eye infections.

Purpose of the Study:

  • To perform molecular identification of Fusarium species responsible for fungal keratitis.
  • To determine the antifungal susceptibility profiles of these Fusarium isolates.

Main Methods:

  • Molecular identification using RNA polymerase gene (RPB2) and translation elongation factor 1-alpha (TEF1).
  • Antifungal susceptibility testing via broth microdilution according to Clinical and Laboratory Standards Institute (CLSI) guidelines.

Main Results:

  • Fusarium solani species complex (including F. solani, F. keratoplasticum, F. falciforme) and Fusarium oxysporum species complex were the predominant isolates.
  • Amphotericin B and natamycin demonstrated the highest efficacy against all tested Fusarium isolates.
  • Voriconazole showed significant antifungal activity, though less potent than amphotericin B and natamycin.

Conclusions:

  • Molecular identification is vital for understanding Fusarium epidemiology in fungal keratitis.
  • Distinct antifungal susceptibility patterns were observed among different Fusarium complexes.
  • Effective treatment of fungal keratitis requires targeted antifungal selection based on species identification and susceptibility testing.