Colistin-daptomycin, colistin-linezolid, colistin-vancomycin combination effects on colistin in multi-resistant acinetobacter baumannii strains
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Abstract
Objective: The most important problem in the treatment of nosocomial Acinetobacter baumannii (A. baumannii) infections which is increasingly seen in recent years is that almost all strains are resistant to many antibiotics, including carbapenems, and that the extinction of antibiotic options to be used in treatment. This leads the clinicians to new treatment options and suggests the use of combined antibiotics to achieve success in both the treatment of multi-drug-resistant A. baumannii (MDRAB) infections as well as to prevent resistance development. We investigated the in vitro activity of colistin in combination with vancomycin, linezolid or daptomycin against MDRAB to determine whether these combinations would be considered for clinical use. .
Methods: The fractional inhibitory concentration (FIC) index was used to determine the antibiotic combination effects and to evaluate the effect of antibiotic combinations on the bacteria.
Results: MIC values of colistin/vancomycin, colistin/linezolid, and colistin/daptomycin in 10 strains (33.3%) gave similar results. Twenty strains gave different MIC results according to antibiotics. The colistin/daptomycin antagonistic ratio was high when the colistin/vancomycin synergy ratio was high compared to the others.
Conclusion: Antibiotic combinations can be used as an alternative treatment approach in multi-drug resistant A. baumannii infections.
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