Cephamycinsbeta-LactamasesCephalosporinsCefoxitinCephalosporin Resistancebeta-LactamsMicrobial Sensitivity TestsAnti-Bacterial AgentsKlebsiella pneumoniaeDrug ResistanceDrug Resistance, MicrobialIsoelectric FocusingDrug Resistance, BacterialPlasmidsDrug Resistance, NeoplasmDrug Resistance, MultipleDisease ResistanceVascular ResistanceDrug Resistance, ViralDrug Resistance, Multiple, BacterialTetracycline ResistanceMutationPlant DiseasesPenicillin Resistance