All of the following are true about Helicobacter pylori except:

Ans. is 'c' i.e., All children in developing countries have immunity by five years of age(Ref: Harrison, 16th/e, p. 886,19th/e, p. 1038; Ananthanarayan, 9th/e, p. 400)* Duodenal ulcer (80%) and Gastric ulcer (60%) are associated with H. pylori.* Gastric adenocarcinoma, gastric MALT lymphoma, Autoimmune gastritis, Hyperacidity.* Chronic gastritis in adults due to the reinfection and Treatment prevents the gastric lymphoma.* Approximately 50% of world population and 85% of developing countries are affected by H. pylori.