although ampicillin plus gentamicin were superior to ampicillin alone ( p less than 0.01 ) in reducing the number of organisms in the spleens , rifampin was superior to all regimens in this regard ( p less than 0.0005 vs piperacillin , ampicillin , tmp/smz ; p less than 0.05 vs ampicillin + gentamicin , erythromycin ) .
C0031955
piperacillin
C0002680
ampicillin