TABLE 1.

MICs of antibiotics for S. marcescens SCH909, E. coli C600 transconjugant, and control E. coli ATCC 25922

AntibioticMIC (μg ml−1) for:
E. coli C600S. marcescens SCH909E. coli C600 transconjugant
Gentamicin164128
Tobramycin0.5128128
Amikacin122
Netilmicin0.588
Streptomycin1642
Neomycin0.56464
Ampicillin4>256>256
Cefoxitin2416
Imipenem0.250.50.5
Cephalothin4256256
Cefotaxime0.061616
Cefoperazone0.1288
Ceftazidime0.251616
Piperacillin1.0>128>128
Azthreonam0.1244
Norfloxacin0.1250.250.125
Ciprofloxacin0.06250.06250.0625
Nalidixic acid>644>64
Chloramphenicol43232
Trimethoprim11616
Sulfamethoxazole16>512>512