Anti-Infective AgentsCephalosporinsAnti-Bacterial AgentsMicrobial Sensitivity TestsGram-Negative Bacteriabeta-LactamasesDrug Resistance, Multiple, BacterialDrug Resistance, BacterialContraceptives, Oral, SyntheticDesogestrelNorpregnenesContraceptives, Oral, CombinedAntimicrobial Cationic PeptidesUreterolithiasisCephalosporin ResistanceContraceptives, OralBacteriaThromboembolismCephaloridineCefotaximeCephalosporinasebeta-LactamsDrug Resistance, MicrobialGram-Positive BacteriaCephalexinPenicillinsCeftriaxoneCefiximeEnterobacteriaceaeHepatitis C AntibodiesCephalothinBacterial InfectionsEscherichia coliAromatase InhibitorsCefmenoximeTime Factorsbeta-Lactam ResistanceKlebsiella pneumoniaeRisk FactorsCeftazidimeMolecular Sequence DataHepatitis CCeftizoximeEnterobacterCefotiamCefazolinTreatment OutcomeStaphylococcus aureusPedigreeEnterobacteriaceae InfectionsCephradinePenicillin ResistanceAztreonamStructure-Activity RelationshipPrevalencePenicillinaseAmino Acid SequenceAmpicillinCarbapenemsGram-Negative Bacterial InfectionsInfant, NewbornLactamsCefoxitinPseudomonas aeruginosa