Helicobacter pyloriHelicobacter InfectionsHelicobacterSerologyGastritisGastric MucosaHelicobacter hepaticusUreaseHelicobacter heilmanniiStomachPeptic UlcerClarithromycinMetronidazoleSerologic TestsDyspepsiaAmoxicillinAntigens, BacterialBacterial ProteinsAnti-Ulcer AgentsAntibodies, BacterialOmeprazoleStomach NeoplasmsGastritis, AtrophicStomach DiseasesBreath TestsBismuthPyloric AntrumStomach UlcerPolymerase Chain ReactionAnti-Bacterial AgentsGastroscopy2-PyridinylmethylsulfinylbenzimidazolesDNA, BacterialEnzyme-Linked Immunosorbent AssayLansoprazoleImmunoglobulin GSeroepidemiologic StudiesBiopsyDrug Therapy, CombinationProton Pump InhibitorsSensitivity and SpecificityMetaplasiaUreaMolecular Sequence DataEndoscopy, GastrointestinalTinidazoleLewis Blood-Group SystemPepsinogen AGerbillinaeRanitidineDuodenitisRNA, Ribosomal, 16SLymphoma, B-Cell, Marginal ZoneFurazolidoneGastrinsHelicobacter mustelaeCytotoxinsPrevalenceRabeprazoleGastric AcidFecesSequence Analysis, DNAGastric MucinsAntacidsPepsinogensAntibodies, ViralPepsinogen CTetracyclineAntitrichomonal AgentsNitroreductasesVirulenceGenes, BacterialBase SequenceGastrointestinal DiseasesPenicillinsDNA, RibosomalChronic DiseaseVirulence FactorsParietal Cells, GastricProspective StudiesImmunoglobulin AImmunoglobulin MPhylogenyBacterial AdhesionChlamydophila pneumoniaeSulfoxidesBacteriological TechniquesEndoscopy, Digestive SystemRisk FactorsCampylobacterCase-Control StudiesDrug Resistance, BacterialOrganometallic CompoundsGastric JuiceRodent DiseasesSpecies SpecificityRNA, Ribosomal, 23SGenotypeCat DiseasesEndoscopy