Table 1.

Strains used in this study

Strainβ-Lactamase producedSource or reference
Serratia marcescensMKDM17IMP-117
Serratia marcescens HKY414AmpC (hyperproduction)This study
Klebsiella pneumoniaeMKD115IMP-117
Klebsiella pneumoniaeHKY402SHV-12This study
Pseudomonas aeruginosaMKAM12IMP-117
Pseudomonas aeruginosa Pa9AmpC (hyperproduction)This study
Pseudomonas putida MSGD1IMP-117
Acinetobacter sp.IMP-1This study
Alcaligenes xylosoxidans MNG10131IMP-117
Enterobacter cloacaeIMP-1This study
Enterobacter aerogenesIMP-1This study
Citrobacter freundiiIMP-1This study
Escherichia coliIMP-1This study
Proteus vulgarisIMP-1This study