Failure of time-kill synergy studies using subinhibitory antimicrobial concentrations to predict in vivo antagonism of cephalosporin-rifampin combinations against Staphylococcus aureus

Author:

Brandt C M1,Rouse M S1,Tallan B M1,Wilson W R1,Steckelberg J M1

Affiliation:

1. Infectious Diseases Research Laboratory, Mayo Clinic, Rochester, Minnesota 55905.

Abstract

Results of in vitro time-kill synergy studies using subinhibitory, inhibitory, or suprainhibitory concentrations of bactericidal agents were compared with treatment outcomes of experimental infective endocarditis due to a methicillin-susceptible strain of Staphylococcus aureus. For rifampin-cephalosporin combinations, in vitro synergy testing using recommended fractions of the MIC failed to predict antagonism in vivo while concentrations above the MIC corresponded with antagonism in vivo.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

Reference22 articles.

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2. In-vitro activity of vancomycin, teicoplanin, daptomycin, ramoplanin, MDL 62873 and other agents against staphylococci, enterococci and Clostridium difficile;Bartoloni A.;J. Antimicrob. Chemother.,1990

3. Efficacy of vancomycin plus rifampin in experimental aortic-valve endocarditis due to methicillin-resistant Staphylococcus aureus: in vitro-in vivo correlations;Bayer A. S.;J. Infect. Dis.,1985

4. Eliopoulos G. M. and R C. Moellering Jr. 1991. Antimicrobial combinations p. 432-492. In V. Lorian (ed.) Antibiotics in laboratory medicine 3rd ed. Williams & Wilkins Co. Baltimore.

5. Garrison P. and L. Freedman. 1970. Experimental endocarditis. NOTES 2193

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