BMS-284756, a novel des-fluoro(6)-quinolone, was used to select for in vitr
o mutants of Staphylococcus aureus ISP794. Step mutants were obtained, and
the quinolone resistance-determining regions of four target genes, gyrA, gy
rB, grlA, and grlB, were sequenced. The data suggest that DNA gyrase is the
primary target for BMS-284756 in S. aureus.