Enterobacter cloacaeEnterobacterEnterobacteriaceae InfectionsEnterobacteriaceaeEnterobacter aerogenesCloacabeta-LactamasesMicrobial Sensitivity TestsCephalosporinsCronobacter sakazakiiAnti-Bacterial Agentsbeta-LactamsCephalosporinaseGram-Negative BacteriaCitrobacter freundiiCephalosporin ResistanceKlebsiellaBacteriaDrug Resistance, MicrobialCeftazidimeMolecular Sequence DataSequence Analysis, DNAPythiumDNA, BacterialKlebsiella pneumoniaeSerratiaCitrobacterPlasmidsCefotaximeSerratia marcescensbeta-Lactam ResistanceEscherichiaDrug Resistance, BacterialBacterial ProteinsImipenemEscherichia coliCarbapenemsGenes, BacterialNitroreductasesBase SequenceCross InfectionGram-Positive BacteriaQuinolonesCefoperazoneCeftizoximePenicillanic AcidAztreonamSerratia InfectionsCloning, MolecularPhylogenyMonobactamsLactamsCefoxitinCucumis sativusThienamycinsAmino Acid SequenceProteusPolymerase Chain ReactionTrinitrotolueneElectrophoresis, Gel, Pulsed-FieldGram-Negative Bacterial InfectionsIsoelectric FocusingKlebsiella oxytocaParabensSulfacetamideConjugation, GeneticAlgeriaDrug Resistance, Multiple, BacterialBacterial Typing TechniquesIntegronsDatabases, Nucleic AcidBacterial InfectionsCephalexinCefmenoximeAntibiosisPiperacillinCiprofloxacinPenicillinsCefotiamPenicillinaseAnti-Infective AgentsBacterial Outer Membrane ProteinsAmpicillinCephaloridineBacteriological Techniques