NIBSC / SCIENCE PHOTO LIBRARY NIBSC / SCIENCE PHOTO LIBRARY
Helicobacter pylori bacteria. Transmission electron micrograph (TEM) of a section through Helicobacter pylori bacteria (formerly Campylobacter pyloridis). These Gram-negative rod shaped (bacilli) bacteria have numerous hair like flagellae (yellow). 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: x6,600 at 5x7cm size.
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