Please use this identifier to cite or link to this item:
Title: In Vitro Interactions of Amphotericin B Combined with Non-antifungal Agents Against Rhodotorula mucilaginosa Strains
Authors: Borba Spader, Tatiana
Ramírez Castrillón, Mauricio
Valente, Patricia
Hartz Alves, Sydney
Severo, Luiz Carlos
Keywords: Rhodotorula mucilaginosa;Combination test;Synergism;Resistance;Amphotericin B
Issue Date: 10-Jan-2019
Publisher: Springer Netherlands
Abstract: Rhodotorula species are emerging as opportunistic pathogens, causing catheter-associated fungemia in patients with compromised immunity. R. mucilaginosa is considered the most common species involved in human infections. Correct identification and susceptibility testing of Rhodotorula isolates recovered from the blood stream or central nervous system are essential to determine the best management of this unusual infection. The antifungal susceptibility tests showed that Rhodotorula was susceptible to low concentrations of amphotericin B (AMB) but was less susceptible to voriconazole. Combinations of AMB plus several non-antifungal medications were evaluated against 35 susceptible (Rm AMB-S) and resistant (Rm AMB-R) clinical Rhodotorula isolates using the broth microdilution checkerboard technique. We showed that in vitro exposure to increasing concentrations of AMB changed the susceptibility profile to these strains, which were named the Rm AMB-R group. The most synergistic interactions were AMB + simvastatin, followed by AMB + amlodipine and AMB + warfarin. Synergism and antagonism were observed in both groups for the combination AMB + cyclosporine A. AMB combined with a fluoroquinolone (AMB + levofloxacin) also demonstrated antagonism for the Rm AMB-S strains, but a high percentage of synergistic interactions was observed for the Rm AMB-R group. A combination drug approach can provide a different strategy to treat infections caused by AMB-resistant R. mucilaginosa.
ISSN: 0301486X
Appears in Collections:Artículos Científicos

Files in This Item:
File Description SizeFormat 
In Vitro Interactions of Amphotericin B Combined.jpg301,83 kBJPEGView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.