==Microscopic evaluation==
[[File:Helicobacter pylori, Gastric Mucosa, H&E (390307642).jpg|thumb|Dozens of the Helicobacter pylori on HE stain, being curved bacteria fill in the lumen of a gastric foveola on H&E stain.]]
Look for:
*''Helicobacter pylori''-like '''bacteria''' in the lumen, as curved, spirochete-like bacteria, generally in the superficial mucus layer and along microvilli of epithelial cells.<ref name=PathologyOutlines/>