Abstract
Ciprofloxacin or rifampin was significantly (P less than 0.05) more effective than vancomycin or the combination of vancomycin plus gentamicin for the treatment of Staphylococcus epidermidis experimental endocarditis. There were no significant differences in efficacy among any of the combinations of antimicrobial agents that included ciprofloxacin or rifampin. One animal treated with rifampin alone and one treated with the combination of vancomycin, rifampin, and gentamicin were found to be infected with rifampin-resistant strains of S. epidermidis during therapy. Resistant subpopulations of S. epidermidis were not detected during therapy with any other antimicrobial agent used alone or in combination. Ciprofloxacin alone or in combination with rifampin was effective therapy against S. epidermidis experimental endocarditis.
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