these are the increasing number of infections due to enterobacter spp. , which constitutively produce large amounts of a beta-lactamase that hydrolyzes cephalosporins , and the recent appearance of klebsiella spp . in many parts of the world that possess new plasmid-mediated beta-lactamases that destroy cefotaxime , ceftazidime , and related third-generation parenteral cephalosporins .
C3536856
cephalosporins
C0007559
ceftazidime