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  • Title: Comparison of different beta-lactam-glycopeptide-gentamicin combinations for an experimental endocarditis caused by a highly beta-lactam-resistant and highly glycopeptide-resistant isolate of Enterococcus faecium.
    Author: Caron F, Pestel M, Kitzis MD, Lemeland JF, Humbert G, Gutmann L.
    Journal: J Infect Dis; 1995 Jan; 171(1):106-12. PubMed ID: 7798650.
    Abstract:
    A synergistic bactericidal effect between penicillin, vancomycin, and gentamicin has been described against enterococci highly resistant to beta-lactams and glycopeptides. Since such a synergy was also observed in vitro between ceftriaxone, teicoplanin, and gentamicin against Enterococcus faecium 70/90, the efficacy of different combinations including penicillin or ceftriaxone, vancomycin or teicoplanin, and gentamicin was compared in vivo in experimental endocarditis. In vitro, all four triple combinations provided a bactericidal effect. In rabbits, after a 5-day treatment, the ceftriaxone-vancomycin-gentamicin combination was the most effective, both in reducing the total bacterial titers and in eradicating the subpopulation resistant to the synergy. Compared with the 5-day regimen, 10- and 20-day regimens of ceftriaxone-vancomycin-gentamicin, each followed by a 3-day antibiotic-free period, increased the number of sterilized animals but failed to avoid the emergence of resistant bacteria, which occurred in 10%-20% of animals.
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