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Life SciencesMicrobiologyPharmacologyAntimicrobial ResistanceBacteriologyMedical MicrobiologyAntibiotic ResistanceAntibiotic Resistance MechanismsBacterial InfectionsBacterial PathogenesisBeta-lactam ResistanceResistance In Gram-negative BacteriaBeta-lactamase GenesCephalosporin TherapyResistance Mechanisms In Gram-negative Bacteria