- Gram-negative, human-specific pathogenic bacteria
- ≈ 3 µm long, spiral/helix-shaped
- ≈ 50% of the world’s population is infected with Helicobacter pylori. A minority of the infected population can develop diseases such as chronic gastritis, peptic ulcers, gastric cancer (adenocarcinoma), and mucosa-associated lymphoid tissue (MALT) lymphoma
- It usually colonizes the human gastric (stomach) epithelium luminal surface
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