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Table 1 Carbapenem β-lactamases

From: The role of carbapenems in initial therapy for serious Gram-negative infections

β-Lactamase Organisms
Class A: KPC 1 to 4 Klebsiella, Escherichia coli, Enterobacter, Salmonella, Pseudomonas
Class B: metallo-β-lactamases Pseudomonas, Acinetobacter, Enterobacter, E. coli, Shigella, Serratia
Class C: AmpC-like Klebsiella, E. coli, Enterobacter, Pseudomonas, Acinetobacter
Class D: oxacillinases Pseudomonas, Acinetobacter, Enterobacter, Serratia
  1. KPC, Klebsiella pneumoniae carbapenemase.