Coloured scanning electron micrograph (SEM) of Helicobacter pylori, Gram-negative, spiral to pleomorphic, spiral rod prokaryote. It can move by means of tiny flagella at the end of the cell. There are many strains of H. pylori which are distinguished by the human disease with which they cause. H. pylori infection is the main cause of chronic superficial gastritis and it is associated with both gastric and duodenal ulcers. It lives in the interface between the surface of gastric epithelial cells (the lining of the stomach). It often clusters at the junctions of epithelial cells. Magnification: x2,200 when shortest axis printed at 25 millimetres.
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