Gastric mucosa with erosive gastritis associated with bacteria. The mucosal surface and adjacent cellular debris is severely colonised by bacteria (red). A few bacteria are seen intracellular in the intact epithelium (arrowhead) as well as within degenerated and necrotic epithelial cells (arrow). In addition, bacteria are found within granulocytes. Fluorescent in situ hybridisation with the probe targeting Bacteria, filter set 43, bar = 25 μm.