peptic ulcer and bacterial infection. helicobacter pylori

anatomy bacteria bacterial bacterium biological biology cancer care cell diagram digestion digestive disease duodenal duodenum educational epithelial gastric gastritis gastrointestinal gel gut health healthcare healthy heartburn helicobacter human illness illustrates illustration infection inflammation mechanism medical medicine micro microbiological microbiology mucosa mucus organ pain peptic pylori science secretes stomach substance system treatment ulcer ulcers