In Vitro Activities of 13 Fluoroquinolones againstStaphylococcus aureus Isolates with Characterized Mutations in gyrA, gyrB, grlA, andnorA and against Wild-Type Isolates

J. L. Muñoz Bellido, M. A. Alonso Manzanares, G. Yagüe Guirao, M. N. Gutiérrez Zufiaurre, M. C. M. Toldos, M. Segovia Hernández, J. A. García-Rodríguez
1999 Antimicrobial Agents and Chemotherapy  
The in vitro activities of 13 fluoroquinolones (FQs) were tested against 90 Staphylococcus aureus clinical isolates: 30 wild type for gyrA, gyrB, grlA andnorA and 60 with mutations in these genes. Clinafloxacin (CI-960), sparfloxacin, and grepafloxacin were the most active FQs against wild-type isolates (MICs at which 90% of isolates were inhibited, 0.06 to 0.1 μg/ml). Mutations in grlA did not affect the MICs of newer FQs. grlA-gyrA double mutations led to higher MICs for all the FQs tested.
more » ... flux mechanisms affected the newer FQs to a much lesser extent than the less recently developed FQs.
doi:10.1128/aac.43.4.966 fatcat:zcj4smwownecphkfehc62zvf6q