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The genus Helicobacter was created in 1989 with H. pylori as the type species. Since then the genus has expanded to include about 18 species. Some species were reclassified from Campylobacter, but most were newly discovered microorganisms from gastric or intestinal sites in mammalian host animals. The essential property of almost all helicobacters is the presence of sheathed flagella. Most species possess strong ureolytic ability, particularly those associated with gastric mucosa, and exhibitdoi:10.1093/oxfordjournals.bmb.a011667 pmid:9604427 fatcat:3xte43y4hbggjdgvzitpwrkmya