CephalosporinsCephalosporin Resistancebeta-LactamasesAnti-Bacterial AgentsMicrobial Sensitivity TestsCephaloridineCephalosporinaseCefotaximeCephalexinCefiximebeta-LactamsPenicillinsCeftriaxoneCephalothinCefmenoximebeta-Lactam ResistanceCeftazidimeCefotiamEnterobacteriaceaeBacteriaCeftizoximeCephradineEnterobacterCefazolinKlebsiella pneumoniaeDrug Resistance, MicrobialPenicillinaseAztreonamEnterobacteriaceae InfectionsCefoxitinGram-Negative BacteriaCefamandolePenicillin ResistanceCephamycinsDrug Resistance, BacterialKlebsiellaCefaclorCefoperazoneCarbapenemsCefmetazoleCefadroxilEscherichia coliAmpicillinKlebsiella InfectionsMoxalactamBacterial InfectionsDrug Resistance, Multiple, BacterialIsoelectric FocusingEnterobacter cloacaePenicillin GCefotetanStructure-Activity RelationshipCefuroximeCephaloglycinClavulanic AcidCross InfectionCefatrizineLactamsGonorrheaPenicillanic AcidCloxacillinImipenemNeisseria gonorrhoeaeGram-Positive BacteriaCefsulodinGram-Negative Bacterial InfectionsDrug UtilizationPenicillin-Binding ProteinsChemistryChemical PhenomenaEscherichia coli InfectionsMonobactamsHydrolysisThienamycinsCitrobacterProteusClavulanic AcidsBacterial ProteinsAdministration, OralProteus vulgarisProteus mirabilisAminoglycosidesKineticsPlasmidsCitrobacter freundiiPenicillin VDNA, BacterialPiperacillinPseudomonas aeruginosaProvidenciaConjugation, GeneticSalmonella paratyphi ADrug StabilityTreatment OutcomeStreptococcus pneumoniaeFluoroquinolonesSulbactamCephapirinMolecular Sequence DataDrug Therapy, Combination