Helicobacter felisHelicobacter InfectionsHelicobacterHelicobacter pyloriGastritisGastric MucosaUreaseHelicobacter heilmanniiStomachStomach NeoplasmsMice, Inbred C57BLMice, KnockoutHelicobacter hepaticusPeptic UlcerClarithromycinMetronidazoleAmoxicillinDyspepsiaBacterial ProteinsAnti-Ulcer AgentsOmeprazoleAntigens, BacterialStomach DiseasesGastritis, AtrophicBismuthPyloric AntrumStomach UlcerBreath Tests2-PyridinylmethylsulfinylbenzimidazolesAnti-Bacterial AgentsAntibodies, BacterialGastroscopyLansoprazoleDNA, BacterialProton Pump InhibitorsDrug Therapy, CombinationMetaplasiaPolymerase Chain ReactionTinidazoleLewis Blood-Group SystemPepsinogen A