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Journal of Antimicrobial Chemotherapy, Vol 39, 63-66, Copyright © 1997 by The British Society for Antimicrobial Chemotherapy

ORIGINAL ARTICLES

Synergic activity of vancomycin-quinupristin/dalfopristin combination against Enterococcus faecium

V Lorian and F Fernandes
Bronx Lebanon Hospital Center, NY 10457, USA.

Clinical specimens were cultured, and the strains identified by the Vitek system as Enterococcus faecium were characterized by their DNA. The MIC vancomycin, quinupristin/dalfopristin and teicoplanin for each isolate was determined. Ten vancomycin-sensitive and ten vancomycin- resistant strains of E. faecium were tested. Quinupristin/dalfopristin at 0.25 x MIC and vancomycin at 0.5 x MIC separately as well as in combination were added to Trypticase Soy Broth tubes inoculated with a 24 h culture. The results obtained by determining cfu at 2, 4, 8, 12 and 24 h indicated that the combination of subinhibitory concentrations of quinupristin/dalfopristin plus vancomycin produced after 24 h, in vancomycin-resistant strains, a consistent degree of synergy. Synergy was observed up to only 12 h when similar combinations were employed for vancomycin-sensitive strains. Vancomycin-sensitive strains tended to be slightly less susceptible to quinupristin/dalfopristin than vancomycin-resistant strains.
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