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In vitro interactions between amphotericin B and other antifungal agents and rifampin against Fusarium spp

T B Spader1, T P Venturini, A S Cavalheiro

  • 1Departamento de Microbiologia e Parasitologia, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.

Mycoses
|September 29, 2009
PubMed

Insights

Investigating synergistic drug interactions for Fusarium infections revealed that amphotericin B combined with caspofungin or rifampin showed the highest synergy. These findings offer new therapeutic possibilities for fusariosis treatment.

Area of Science:

  • Medical Mycology
  • Infectious Diseases
  • Pharmacology

Background:

  • Fusarium species are common soil fungi and plant pathogens.
  • They are opportunistic pathogens causing infections in immunocompromised individuals.
  • Current treatments for fusariosis have uncertain outcomes, necessitating novel therapeutic strategies.

Purpose of the Study:

  • To evaluate the in vitro synergistic interactions of amphotericin B with various antifungal agents against Fusarium species.
  • To identify effective drug combinations for potential fusariosis treatment.

Main Methods:

  • The study utilized the chequerboard method to assess drug interactions.
  • Fractional inhibitory concentration indices were employed to quantify synergy.
  • Multiple antifungal drugs were tested in combination with amphotericin B against Fusarium isolates.

Main Results:

  • High percentages of synergistic interactions were observed for amphotericin B combined with caspofungin (68.7%) and rifampin (68.7%).
  • Synergy was also noted for amphotericin B plus 5-flucytosine (59.3%) and amphotericin B with voriconazole (37.5%).
  • Variations in susceptibility patterns among Fusarium species influenced combination effects.

Conclusions:

  • Combinations of amphotericin B with caspofungin, rifampin, 5-flucytosine, and voriconazole demonstrate significant in vitro synergy.
  • These synergistic interactions represent promising avenues for developing improved therapeutic regimens for fusariosis.

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