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Since its first isolation by Marshall and Warren, Helicobacter pylori (H. pylori) has been recognized to have a causal role in the upper gastrointestinal diseases development, especially in chronic gastritis, peptic ulcer disease, mucosa-associated lymphoid tissue (MALT lymphoma) and gastric adenocarcinoma. H. pylori is a spiral-shaped gram-negative flagellate bacterium that has a high genetic diversity, which is an important factor in its adaptation to the host stomach and also for thedoi:10.4236/health.2014.64039 fatcat:xl2tajlvcrauxmsnzozgotpg4i