Table 1.

Characteristics of the isolates of A. baumannii studied

CharacteristicValue for isolate:
122FFC65FFC3625aATCC 19606
Date isolated (mo/yr)4/989/98
MIC (mg/liter)
 Amoxicillin>256>256>256>256
 Amoxicillin-clavulanate816164
 Piperacillin4848>25616
 Ceftazidime>256>256488
 Ceftriaxone>256>256>25632
 Cefepime>256>2562416
 Aztreonam64649616
 Imipenem>32>3220.38
 Meropenem>32>32NDbND
 Ciprofloxacin1.50.5NDND
Hydrolysis by crude extracts (U/mg of protein)c
 Imipenem247.79205.50.950.32
  ZnCl2d273.8229.96NDND
  EDTAe37.3445.32NDND
 Nitrocefin2,087.471,871.7513,4526.15
  • a Clinical strain from laboratory collection.

  • b ND, not determined.

  • c Nanomoles of substrate hydrolyzed per minute per milligram of protein.

  • d Enzyme activity in the presence of 1 mM ZnCl2 solution.

  • e Enzyme activity in the presence of 1 mM EDTA solution after 10 min of preincubation with extract at 30°C.