the mouse-protection test with intraperitoneal inoculation of streptococcus pneumoniae type 3 was employed to compare the effect in vivo and to correlate with activity in vitro of ampicillin , piperacillin , methicillin , cefuroxime , erythromycin , vancomycin and gentamicin .
C0002680
ampicillin
C0031955
piperacillin