with gram-negative aerobic bacteria , cefoxitin , which is known to be more resistant to beta-lactamases from gram-negative bacteria than any cephalosporin , was found to be more effective than cefuroxime and cephaloridine against ampicillin-resistant strains of escherichia coli and indole-positive strains of proteus .
C3536856
cephalosporin
C0007562
cefuroxime