Helicobacter pyloriHelicobacter InfectionsGastritisGastric MucosaUreaseHelicobacterPeptic UlcerAmoxicillinDyspepsiaClarithromycinAnti-Ulcer AgentsGastritis, AtrophicOmeprazoleStomach NeoplasmsStomachMetronidazoleBreath TestsDuodenal UlcerStomach DiseasesBismuthPyloric AntrumStomach UlcerAntibodies, BacterialGastroscopyAntigens, Bacterial2-PyridinylmethylsulfinylbenzimidazolesBacterial ProteinsAnti-Bacterial AgentsPepsinogen ADrug Therapy, CombinationMetaplasiaProton Pump InhibitorsEndoscopy, GastrointestinalUreaLansoprazoleTinidazoleBiopsyPepsinogen CDuodenitisRanitidineGastrinsFurazolidonePepsinogensGastric AcidGerbillinaeRabeprazoleAntitrichomonal AgentsPeptic Ulcer HemorrhageImmunoglobulin GSeroepidemiologic StudiesPrevalenceEndoscopy, Digestive SystemLymphoma, B-Cell, Marginal ZoneTetracyclinePenicillinsEnzyme-Linked Immunosorbent AssayParietal Cells, GastricHelicobacter hepaticusSulfoxidesAzure StainsHelicobacter heilmanniiSensitivity and SpecificityLewis Blood-Group SystemAntacidsGastroesophageal RefluxAchlorhydriaEndoscopyGastric MucinsOrganometallic CompoundsPolymerase Chain ReactionGastrointestinal DiseasesGastric JuiceRisk FactorsDNA, BacterialSerologic TestsCase-Control StudiesGastric Acidity DeterminationChronic DiseaseEsophagitisProspective StudiesCardiaBenzimidazolesFecesEsophagitis, PepticPrecancerous ConditionsVirulenceHelicobacter felisEpithelial CellsDuodenoscopyEsomeprazoleLevofloxacinDrug Resistance, BacterialMolecular Sequence DataTreatment OutcomeBacterial AdhesionCytotoxinsAnti-Inflammatory Agents, Non-SteroidalNorthwest TerritoriesInterleukin-8Virulence Factors