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Helicobacter pylori bacteria. Coloured scanning electron micrograph (SEM) of Helicobacter pylori bacteria on the surface of the human gut. Formerly known as Campylobacter pyloridis, these are Gram- negative bacilli (rod-shaped) bacteria. Colonies of H. pylori occur on the stomach mucous membrane in people who suffer from gastritis, and these bacteria have 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: x9000 at 6x6cm size.
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