A. DOWSETT, HEALTH PROTECTION AGENCY / SCIENCE PHOTO LIBRARY A. DOWSETT, HEALTH PROTECTION AGENCY / SCIENCE PHOTO LIBRARY
Helicobacter pylori bacterium. Coloured transmission electron micrograph (TEM) of a Helicobacter pylori bacterium (formerly Campylobacter pyloridis). This gram-negative bacillus (rod-shaped) bacterium is curved (as here) or spiral in shape. Numerous hair-like flagellae are visible (light blue). Colonies of H. pylori occur on the stomach mucous membrane in people who suffer from gastritis, and this bacteria has been linked to stomach ulcer formation. H. pylori may also be a co-factor for gastric cancer as its presence increases the risk of stomach tumours. Magnification: x18,500 at 6x7cm size.
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