Table 1.

Strains used in this study

Strainβ-Lactamase producedSource or reference
Serratia marcescensMKDM17IMP-1 17
Serratia marcescens HKY414AmpC (hyperproduction)This study
Klebsiella pneumoniaeMKD115IMP-1 17
Klebsiella pneumoniaeHKY402SHV-12This study
Pseudomonas aeruginosaMKAM12IMP-1 17
Pseudomonas aeruginosa Pa9AmpC (hyperproduction)This study
Pseudomonas putida MSGD1IMP-1 17
Acinetobacter sp.IMP-1This study
Alcaligenes xylosoxidans MNG10131IMP-1 17
Enterobacter cloacae IMP-1This study
Enterobacter aerogenes IMP-1This study
Citrobacter freundii IMP-1This study
Escherichia coli IMP-1This study
Proteus vulgaris IMP-1This study