Helicobacter pyloriHelicobacter InfectionsHelicobacterGastritisGastric MucosaUreasePeptic UlcerClarithromycinMetronidazoleStomachAmoxicillinDyspepsiaAnti-Ulcer AgentsBacterial ProteinsOmeprazoleStomach NeoplasmsStomach DiseasesGastritis, AtrophicBismuthAntigens, BacterialPyloric AntrumDuodenal UlcerEpidemiologyBreath TestsAnti-Bacterial AgentsStomach UlcerHelicobacter hepaticusGastroscopyAntibodies, BacterialHelicobacter heilmanniiMolecular EpidemiologyLansoprazole2-PyridinylmethylsulfinylbenzimidazolesProton Pump InhibitorsDrug Therapy, CombinationTinidazoleLewis Blood-Group SystemMetaplasiaPepsinogen ADNA, BacterialBiopsyRanitidineUreaEndoscopy, GastrointestinalDuodenitisFurazolidoneGerbillinaePolymerase Chain ReactionMolecular Sequence DataCytotoxinsGastrinsGastric AcidPrevalenceLymphoma, B-Cell, Marginal ZonePepsinogensTetracyclineAntacidsAngiomatosis, BacillaryAntitrichomonal AgentsPenicillinsNitroreductasesVirulenceGenes, BacterialRabeprazoleImmunoglobulin GPylorusVirulence FactorsBacterial AdhesionSeroepidemiologic StudiesGastric MucinsGastric JuiceAcute PainGenotypeMicrobial Sensitivity TestsSulfoxidesEnzyme-Linked Immunosorbent AssayEndoscopy, Digestive SystemGastrointestinal DiseasesDrug Resistance, BacterialFecesSensitivity and SpecificityAntigens, CD15AchlorhydriaParietal Cells, GastricAdhesins, BacterialRisk FactorsSequence Analysis, DNAGastroesophageal RefluxGenomic IslandsPeptic Ulcer HemorrhageBase SequenceGene Expression Regulation, BacterialEpithelial CellsGenome, BacterialCampylobacterInterleukin-8Chronic DiseaseProspective StudiesRNA, Ribosomal, 23SSerologic Tests