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Staphylococcus epidermidis is a frequent cause of device-associated infections. In this study, we compared the efficacy of daptomycin versus vancomycin against biofilm-producing methicillin-resistantS. epidermidis (MRSE) strains in a murine model of foreign-body and systemic infection. Two bacteremic biofilm-producing MRSE strains were used (SE284 and SE385). The MIC of daptomycin was 1 mg/liter for both strains, and the MICs of vancomycin were 4 and 2 mg/liter for SE284 and for SE385, respectively. Thein vitro bactericidal activities of daptomycin and vancomycin were evaluated by using time-kill curves. The model of foreign-body and systemic infection of neutropenic female C57BL/6 mice was used to ascertainin vivo efficacy. Animals were randomly allocated into three groups (n = 15): without treatment (controls) or treated with daptomycin at 50 mg/kg/day or vancomycin at 440 mg/kg/day.In vitro , daptomycin showed concentration-dependent bactericidal activity, while vancomycin presented time-dependent activity. In the experimentalin vivo model, daptomycin and vancomycin decreased liver and catheter bacterial concentrations (P &lt; 0.05) and increased the survival and the number of sterile blood cultures (P &lt; 0.05) using both strains. Daptomycin produced a reduction in the bacterial liver concentration higher than 2.5 log10 CFU/g compared to vancomycin using both strains, with this difference being significant (P &lt; 0.05) for infection with SE385. For the catheter bacterial concentrations, daptomycin reduced the concentration of SE284 3.0 log10 CFU/ml more than did vancomycin (P &lt; 0.05). Daptomycin is more effective than vancomycin for the treatment of experimental foreign-body and systemic infections by biofilm-producing methicillin-resistantS. epidermidis .

antimicrobial agents and chemotherapy

Efficacy of Daptomycin versus Vancomycin in an Experimental Model of Foreign-Body and Systemic Infection Caused by Biofilm Producers and Methicillin-Resistant Staphylococcus epidermidis