helicobacter pylori has unique way of adapting even in concentrated acid and gallon of gastric juice. it posses enzyme urease which create a cloud of acid around itself ,neutralizing chemicals around it and protecting it from the acid in the stomach. and as we all know gastric ulcer is the breaking of normal linning of stomach. when the mucous of stomach is destroyed thn too much of acid worsen the ulcer.h.pylori is the highly risk factor whereas acids promotes the ulcer .both acid and bacteria will irritate the linning of stomach and duodenum, which may further lead to perforation,bleeding etc etc. so no more titaura , pickle and spicy food for rose sis! most h.pylori are silent in many people and produce no symptom. *smilies*heii pundit ! thanks for starting this thread. i got to review few points!and good luck with ur research! *ashish * ~*ruIna*~