Table 2.

β-Lactam antibiotics on microdilution panels examined for their ability to discriminate β-lactamases

β-Lactam antibioticRange of concn (μg/ml) for:
N + 2 panelNU 7 panel
Aztreonam1–32a
Cefamandole4–32
Cefonicid2–16
Cefoperazone4–324–32
Cefotaxime2–64
Cefotetan4–32
Cefoxitin2–16
Cefpodoxime0.5–4
Ceftazidime1–322–16
Ceftizoxime2–32
Ceftriaxone2–644–32
Cefuroxime2–16
Cephalothin2–16
  • a —, not included on panel.