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Relative abundance levels of bacterial phyla (A) and genera (B) in the gastric microbiota of the five groups. HPHS: H. suis and H. pylori coinfection; HPHF: H. felis and H. pylori coinfection; HPHM: H. salomonis and H. pylori coinfection; HP: H. pylori monoinfection; CT: Helicobacter-negative.
