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Distributions of α diversity indices (A: observed species index, B: Shannon diversity index) and β diversity indices (C: Weighted Unifrac distance based, D: Bray–Curtis distance based) among the five groups. HPHS: Helicobacter 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.
