Figure 5.

Schematic diagram of type I H. pylori infection. (A) Normal stomach structure. (B) The initial stage of type I Helicobacter pylori infection is limited to the gastric antrum. (C) Type I H. pylori infection progresses to the lesser curvature of the stomach. (D) Lesser curvature atrophy; Type I H. pylori infection extends from lesser curvature to greater curvature; Inflammation affects the whole stomach. (E) With the lesser curvature as the center, the atrophy extends to the periphery, accompanied by intestinal metaplasia and persistent active inflammation in the greater curvature.