The antibacterial activities of DuP 105 and DuP 721, new oxazolidinone antimicrobial agents, were compared with those of beta-lactams and glycopeptides. Ninety percent of Staphylococcus aureus and Staphylococcus epidermidis isolates, including methicillin-resistant isolates, were inhibited by 4 micrograms of DuP 105 and 1 microgram of DuP 721 per ml. DuP 721 inhibited hemolytic streptococcus gr...