Recent studies have shown that new antimicrobial agents such as linezolid and quinupristin/dalfopristin constitute a potential treatment against multiresistant Gram-positive
bacteria (Karlowsky et al., 1999; Nadler et al., 1999; Ry-back et al., 2000).
Nevertheless, glycopeptide antibiotic are frequently used against enterococcal infections, and resistance against them is seriously increasing.