Helicobacter pyloriHelicobacter InfectionsHelicobacterGastritisGastric MucosaUreasePeptic UlcerClarithromycinMetronidazoleStomachAmoxicillinDyspepsiaAnti-Ulcer AgentsOmeprazoleBacterial ProteinsStomach NeoplasmsStomach DiseasesGastritis, AtrophicBismuthPyloric AntrumAntigens, BacterialDuodenal UlcerBreath TestsStomach UlcerAnti-Bacterial AgentsHelicobacter hepaticusGastroscopyAntibodies, BacterialHelicobacter heilmanniiLansoprazole2-PyridinylmethylsulfinylbenzimidazolesProton Pump InhibitorsDrug Therapy, CombinationTinidazoleLewis Blood-Group SystemMetaplasiaPepsinogen ABiopsyRanitidineUreaDNA, BacterialEndoscopy, GastrointestinalDuodenitisFurazolidoneGerbillinaePolymerase Chain ReactionCytotoxinsGastrinsMolecular Sequence DataGastric AcidLymphoma, B-Cell, Marginal ZonePepsinogensAntacidsTetracyclinePepsinogen CAntitrichomonal AgentsNitroreductasesPenicillinsRabeprazolePylorusImmunoglobulin GGenes, BacterialVirulenceBacterial AdhesionVirulence FactorsGastric MucinsGastric JuiceOrganometallic CompoundsSulfoxidesEndoscopy, Digestive SystemGastrointestinal DiseasesEnzyme-Linked Immunosorbent AssayAntigens, CD15Seroepidemiologic StudiesAchlorhydriaParietal Cells, GastricAdhesins, BacterialPrevalenceGastroesophageal RefluxSensitivity and SpecificityMicrobial Sensitivity TestsGenomic IslandsPeptic Ulcer HemorrhageGene Expression Regulation, BacterialEpithelial CellsInterleukin-8Drug Resistance, BacterialRNA, Ribosomal, 23SAzure StainsGenome, BacterialFecesCampylobacterBase SequenceEndoscopyColony Count, MicrobialSerologic TestsGenotypeChronic DiseaseHistamine H2 AntagonistsSequence Analysis, DNA