<unk>  is caused by H.<unk>  which is a gram-negative, microaerophilic, and acidophilic bacterium that infects various areas of the stomach and duodenum. It is the most prevalent, worldwide and chronic infection. It is associated with many gastrointestinal diseases like gastritis, peptic ulcer disease, adenocarcinoma and MALT lymphoma. It is estimated that 30%-40% of the United States population is associated with H.<unk>  infection.
Helicobacter pylori infection
Gastroesophageal reflux disease
Eosinophilic esophagitis pathophysiology
Hookworm infection
Atrophic gastritis
Intravenous drug use 
Ethnic group
Peanut allergy