TABLE 2.

Activities of eight β-lactam agents against 195a randomly selected isolates of Acinetobacter spp., using both conservative and liberal MIC readings

Antimicrobial agentReadingcMIC (μg/ml)% Susceptible isolatesb
50%90%Range
Ampicillin-sulbactamCons8>640.12->6463.6
Lib4>640.12->6468.7
PiperacillinCons128>128≤1.0->12830.8
Lib32>128≤1.0->12838.5
Piperacillin-tazobactamCons64>128≤1.0->12843.1
Lib16>128≤1.0->12855.9
Ticarcillin-clavulanateCons32>128≤1.0->12846.7
Lib16>128≤1.0->12854.4
CeftazidimeCons16>64≤0.5->6444.6
Lib8>64≤0.5->6450.8
CefotaximeCons32>64≤0.5->6415.9
Lib32>64≤0.5->6420.5
CeftriaxoneCons32>64≤0.5->6419.0
Lib32>64≤0.5->6422.1
CefepimeCons16>64≤0.5->6448.5
Lib8>64≤0.5->6454.1
  • a One unidentified isolate did not grow in the MIC plate.

  • b According to NCCLS criteria.

  • c Cons, conservative reading, i.e., not ignoring any growth; Lib, liberal reading, i.e., ignoring colonies or subtle growth patterns.