Synergy of penicillin and decreasing concentration of aminoglycosides against enterococci from patients with infective endocarditis.

Abstract:

:To determine whether low concentrations of aminoglycosides in combination with penicillin could effectively kill enterococci in vitro, we tested penicillin (20 micrograms/ml) in combination with decreasing concentrations of either streptomycin (20, 10, 5, and 1 micrograms/ml) or gentamicin (5, 3, 1, and 0.5 micrograms/ml) against 13 strains of streptomycin-susceptible and 7 strains of streptomycin-resistant enterococci isolated from patients with infective endocarditis. At 24 h, penicillin plus each increment in streptomycin concentration resulted in a statistically significant increase in killing of streptomycin-susceptible enterococci, compared with the next lower streptomycin concentration (P less than 0.01). At 24 h, against streptomycin-susceptible and streptomycin-resistant enterococci, there were no statistically significant differences in killing between combinations containing 5 micrograms of gentamicin per ml and those containing 3 micrograms/ml. Against streptomycin-susceptible enterococci, there were statistically significant differences in killing between combinations containing 3 micrograms of gentamicin per ml and those containing 1 micrograms/ml. Against streptomycin-resistant enterococci, statistically significant differences in killing were detected with combinations containing 5 micrograms of gentamicin per ml and those containing 1 microgram/ml.

authors

Matsumoto JY,Wilson WR,Wright AJ,Geraci JE,Washington JA 2nd

doi

10.1128/aac.18.6.944

subject

Has Abstract

pub_date

1980-12-01 00:00:00

pages

944-7

issue

6

eissn

0066-4804

issn

1098-6596

journal_volume

18

pub_type

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