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The incidence of the various mutations in the genes encoding topoisomerase IV and DNA gyrase in fluoroquinolone-resistant clinical isolates of Staphylococcus aureus is not known. Using restriction fragment length polymorphism analysis and DNA sequencing, we found that in fluoroquinolone- and methicillin-resistant strains, mutations in grlA and gyrA are quite likely to be present together. For fluoroquinolone-resistant but methicillin-susceptible strains, mutations in grlA alone are more common.

Topoisomerase Mutations in Fluoroquinolone-Resistant and Methicillin-Susceptible and -Resistant Clinical Isolates of Staphylococcus aureus