<unk>  is an acute or chronic illness caused by infection of the stomach with the bacterium H.<unk> . The infection is mostly without symptoms. Approximately half of worlds population is infected with H.<unk> . The disease is characterized by dyspepsia, gastritis, peptic ulcer disease, adenocarcinoma of stomach or MALT lymphoma.
Helicobacter pylori infection
Gastroesophageal reflux disease
Eosinophilic esophagitis pathophysiology
Hookworm infection
Atrophic gastritis
Intravenous drug use 
Ethnic group
Peanut allergy