The bacterium was first identified in 1982 by Australian doctors Barry Marshall and Robin Warren. Its helical shape (from which the genus name, helicobacter, derives) is thought to have evolved in order to penetrate the mucoid lining of the stomach and thereby establish infection. Helicobacter pylori, previously known as Campylobacter pylori, is a gram-negative, microaerophilic, spiral (helical) bacterium usually found in the stomach. Proton pump inhibitor, clarithromycin, amoxicillin, metronidazole Urea breath test, fecal antigen assay, tissue biopsy Helicobacter pylori spread by fecal oral route Hematemesis, Melena, abdominal pain, nausea
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