The ability of beta-lactam antibiotics to select mutants with derepressed beta-lactamase synthesis from Citrobacter freundii.

Abstract excerpt

The ability of beta-lactam compounds to induce synthesis of the class C beta-lactamase of Citrobacter freundii was assessed both directly and indirectly, the latter by measurement of the different susceptibilities of strains with inducible and depressed beta-lactamase synthesis and those of a beta-lactamase-negative strain. Most beta-lactam compounds were poor inducers but ampicillin, amoxycillin and cephalexin...

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