the majority of the strains were resistant to ampicillin and cephalothin , moderately susceptible to carbenicillin ( 70 % to 100 microgram/ml ) and highly susceptible to piperacillin ( 100 % to 25 microgram/ml , 88 % to 6.25 microgram and 60 % to 3.12 microgram/ml ) .
C0002680
ampicillin
C0031955
piperacillin