I think there's still quite a bit of doubt, and every GP's [???] whether it actually causes it since it's been found in a lot of people who have never had peptic ulcer.
This 6-fold increased acid secretion in the duodenal ulcer patients completely disappeared when we eradicated the Helicobacter pylori infection, so th... [???] (show) the infection was actually causing this marked increased acid secretion by the stomach.