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[Comment] At last, vaccine-induced protection against

For a quarter of a century, countless attempts have been made to produce an effective vaccine against Helicobacter pylori, a major cause of peptic ulcer disease and gastric adenocarcinoma.1 An effective vaccine against H pylori is needed most for prevention of gastric adenocarcinoma, the third leading cause of cancer-related death worldwide.2 However, efforts to produce such a vaccine have so far failed, and H pylori vaccine research has slowed in the past few years. The main reason for this might have been disillusionment, arising from the inability to produce a vaccine that completely protects against the infection.