DR KLAUS BOLLER / SCIENCE PHOTO LIBRARY DR KLAUS BOLLER / SCIENCE PHOTO LIBRARY
Helicobacter pylori bacterium, coloured transmission electron micrograph (TEM). Formerly known as Campylobacter pyloridis, H. Pylori is a spiral-shaped Gram-negative bacteria. The terminal flagella (hair-like structures) are used for locomotion. Colonies of H. pylori are found in the mucus lining of the stomach. They cause gastritis, and are also the most common cause of stomach ulcers. H. pylori may also be a cause or co-factor for gastric cancer, as its presence increases the risk of developing stomach tumours.
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