JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
Helicobacter pylori. Artwork of five Helicobacter pylori bacteria in a person's digestive system. This species was formerly known as Campylobacter pyloridis. These Gram-negative rod-shaped (bacill- us) bacteria are curved or spiral in shape, with hair-like flagellae which they use to propel themselves. Colonies of H. pylori occur on the stomach mucous membrane in people suffering gastritis, and this bacteria has been linked to stomach ulcer formation. H. pylori may also be a contributing factor for gastric cancer, as its presence increases the risk of stomach tumours.
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