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  • Title: Chemotherapy of experimental streptococcal endocarditis. IV. Further observations on prophylaxis.
    Author: Pelletier LL, Durack DT, Petersdorf RG.
    Journal: J Clin Invest; 1975 Aug; 56(2):319-30. PubMed ID: 1150874.
    Abstract:
    The ability of antibiotics to prevent Streptococcus sanguis endocarditis was tested in rabbits. Only vancomycin or a combination of penicillin G plus streptomycin always prevented infection when administered as a single dose. A loading dose of 30 mg/kg of phenoxymethyl penicillin (penicillin V) followed by additional 7.5 mg/kg doses for 48 h proved to be the only successful prophylactic program that could be given orally to man. Cefazolin alone or with streptomycin in multiple doses was also an effective alternative to penicillin or penicillin derivatives. Erythromycin uniformly failed to protect animals from bacterial endocarditis but showed greater prophylactic efficacy when a low inoculum of streptococci was used.
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