EnterobacteriaceaeEnterobacteriaceae Infectionsbeta-LactamasesMicrobial Sensitivity TestsAnti-Bacterial Agentsbeta-Lactam ResistanceEnterobacterCarbapenemsProteusSerratiaBacteriological TechniquesKlebsiellaEscherichiaKlebsiella pneumoniaebeta-LactamsCephalosporinsGram-Negative BacteriaDrug Resistance, MicrobialBacteriaCitrobacterDrug Resistance, BacterialEscherichia coliDrug Resistance, Multiple, BacterialBacterial ProteinsDNA, BacterialSalmonellaEnterobacter cloacaeGram-Negative Bacterial InfectionsSerratia marcescensKlebsiella InfectionsCefotaximeCeftazidimeVibrionaceae