Mechanisms of resistance to beta-lactam antibiotics in Acinetobacter calcoaceticus.

Abstract excerpt

Examination of 12 strains of Acinetobacter calcoaceticus revealed that the strains expressed different constitutive levels of beta-lactamase. Mutants resistant to cefoxitin, cefoperazone or ceftazidime were selected from a strain producing a low level of beta-lactamase. All the mutants showed no change in expression of beta-lactamase, but produced penicillin-binding proteins with altered expression and/or...

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