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Antimicrobial Agents and Chemotherapy, August 2003, p. 2655-2658, Vol. 47, No. 8
0066-4804/03/$08.00+0 DOI: 10.1128/AAC.47.8.2655-2658.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
Efficacy of Linezolid plus Rifampin in an Experimental Model of Methicillin-Susceptible Staphylococcus aureus Endocarditis
Charlene F. Dailey,1 Paul J. Pagano,1 Lewis V. Buchanan,1 Jennifer A. Paquette,1 Joseph V. Haas,2 and John K. Gibson1*
Pharmacology,1
Non-Clinical Statistics, Pfizer, Kalamazoo, Michigan 490012
Received 14 January 2003/
Returned for modification 3 March 2003/
Accepted 7 May 2003
The efficacy of linezolid, alone or in combination with rifampin, against methicillin-susceptible Staphylococcus aureus in rabbits with experimental endocarditis was investigated. Linezolid (50 or 75 mg/kg of body weight), rifampin, and linezolid (25, 50, or 75 mg/kg) plus rifampin produced statistically significant reductions in bacterial counts compared with those in untreated controls. Plasma or valvular vegetation levels of linezolid in the groups treated with the linezolid-rifampin combination were similar to those in the respective linezolid-only treatment groups. At therapeutic levels of linezolid, rifampin resistance was not observed. The results from this experimental model of endocarditis suggest that while rifampin did not provide synergy to the linezolid dosing, it did not antagonize the efficacy of linezolid.
* Corresponding author. Mailing address: Pfizer, 700 Chesterfield Pkwy, AA4A, Chesterfield, MO 63017. Phone: (636) 247-7078. Fax: (636) 247-6987. E-mail:
John.K.Gibson{at}pfizer.com.
Antimicrobial Agents and Chemotherapy, August 2003, p. 2655-2658, Vol. 47, No. 8
0066-4804/03/$08.00+0 DOI: 10.1128/AAC.47.8.2655-2658.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
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