Helicobacter pyloriHelicobacter InfectionsGastritisHelicobacterGastritis, AtrophicBacteriaGastric MucosaUreaseStomachPyloric AntrumHelicobacter heilmanniiBacterial ProteinsHelicobacter hepaticusStomach NeoplasmsPeptic UlcerGastroscopyMetaplasiaDyspepsiaDNA, BacterialStomach DiseasesPepsinogen AStomach UlcerAmoxicillinGram-Positive BacteriaMolecular Sequence DataAntigens, BacterialGram-Negative BacteriaGastritis, HypertrophicClarithromycinMetronidazoleAnti-Bacterial AgentsAnti-Ulcer AgentsRNA, Ribosomal, 16SOmeprazoleAchlorhydriaBacteria, AnaerobicPhylogenyGastrinsAntibodies, BacterialBismuthSequence Analysis, DNADNA, RibosomalPepsinogen CDuodenitisBiopsyPolymerase Chain ReactionBile RefluxParietal Cells, GastricGenes, Bacterial2-PyridinylmethylsulfinylbenzimidazolesChronic DiseaseEscherichia coliBreath TestsEndoscopy, GastrointestinalPepsinogensBacteria, AerobicColony Count, MicrobialCampylobacterGastric JuiceLansoprazoleBase SequenceSpecies SpecificityGenome, BacterialProton Pump InhibitorsGastric AcidBacterial AdhesionRNA, BacterialGene Expression Regulation, BacterialAmino Acid SequenceDrug Therapy, CombinationCulture MediaWater MicrobiologyVirulenceHelicobacter felisDuodenal UlcerGerbillinaePrecancerous ConditionsGram-Negative Anaerobic BacteriaMicrobial Sensitivity TestsAnemia, PerniciousFecesLewis Blood-Group SystemBacteriological TechniquesTinidazoleAcinonyxCytotoxinsEndoscopyLymphoma, B-Cell, Marginal ZoneEndoscopy, Digestive SystemHydrogen-Ion ConcentrationAntacidsUreaBacterial Physiological Phenomena