In contrast to H. pylori infection the rare colonization of the gastric mucosa with H. heilmannii, mainly circumscribed and mostly in the antrum, induces a very much milder form of gastritis in the antrum and corpus, which may also be the reason for the rarity of concurrent erosions and ulcers. Whether the observed relatively frequent association of H. heilmannii infection and gastric MALT lymphoma is coincidental, and whether H. heilmannii gastritis is more commonly associated with MALT lymphoma than is H. pylori gastritis must be investigated in further studies.

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