title: In a world of black and white, Helicobacter pylori is gray.
authors.forename: M J
authors.initials: MJ
authors.lastname: Blaser
mesh_terms: D005756:Gastritis / Q000188:drug therapy*; D016481:Helicobacter Infections / Q000188:drug therapy*; D016480:Helicobacter pylori; D006801:Humans; D010437:Peptic Ulcer / Q000382:microbiology; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000382:microbiology