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Gastric microbial composition in the healthy and diseased stomach. Under normal healthy conditions without evidence of excessive inflammation, Helicobacter pylori (H. pylori) exists in very low abundance. On the contrary, in chronic gastritis, H. pylori is the predominant bacteria with the presence of other microorganisms as well but at lower rates. However, as the sequalae of carcinogenesis moves towards malignancy, oral or intestinal-type pathogens exclusively predominate.
