Comparative in-vitro activities of quinupristin-dalfopristin against Gram-positive bloodstream isolates.

The in-vitro activity of quinupristin-dalfopristin was compared with those of vancomycin, teicoplanin, erythromycin, clarithromycin, rifampicin, imipenem, meropenem, ciprofloxacin and sparfloxacin against 414 bloodstream isolates of Gram-positive cocci. Quinupristin-dalfopristin inhibited strains of Streptococcus pyogenes and Streptococcus agalactiae at 0.12 mg/L, methicillin- and/or erythromycin-resistant Staphylococcus aureus and Staphylococcus epidermidis at 0.5 mg/L, Staphylococcus haemolyticus, Enterococcus faecium, Streptococcus pneumoniae, Streptococcus mitis, Streptococcus bovis, Streptococcus sanguis and Streptococcus anginosus at 1 mg/L and Enterococcus faecalis at 8 mg/L.