TABLE 1

Antibacterial activities of various agents inhibiting 50% and 90% of strains isolated from CF patients a

OrganismConcn (mg/liter)
CPX LVX Tobramycin Amikacin Aztreonam Colistin
MIC50MIC90MIC50MIC90MIC50MIC90MIC50MIC90MIC50MIC90MIC50MIC90
P. aeruginosa 1–281–280.5–88–2568–16>1284–864–1280.5–20.5–8
S. maltophilia 41628>32>32128>128>128>12828
B. cepacia 432432>32>32128>12832>128IRIR
A. xylosoxidans 416416>32>32>128>12864>1288>16
MRSA16>324>32128>128816>512>512IRIR
  • a Data were derived from references 59 70. CPX, ciprofloxacin; LVX, levofloxacin; IR, intrinsically resistant.