the in vitro activity of u-63196e , a new broad-spectrum cephalosporin antibiotic , was studied against various gram-positive and gram-negative bacteria and compared with the in vitro activities of cefotaxime , moxalactam , cefoperazone , ceftazidime , and aztreonam .
C3536856
cephalosporin
C0007559
ceftazidime