the antibacterial activity and pharmacokinetics of the beta-lactamase-stable cephalosporin cefuroxime and the gram-negative beta-lactamase-susceptible cephalosporin cefazolin were compared in two contrasting infection models in which proteus morganii 82 , which produces chromosomally mediated beta-lactamase , was the pathogen .
C0728805
beta-lactamase
C0597979
beta-lactamase