Penicillin-tobramycin synergism against enterococci: a comparison with penicillin and gentamicin

Combinations of penicillin plus tobramycin have been compared with penicillin plus gentamicin against 27 strains of enterococci isolated from blood cultures. Penicillin plus gentamicin was synergistic against all strains. The combination of penicillin plus tobramycin was equally effective against strains of Streptococcus facalis, but was ineffective against all four strains of S. faecium tested.