“…If often asymptomatic, the H. pylori-associated non-ulcer dyspepsia is clearly the strongest aetiological factor for severe gastric diseases that will develop late in adult life in a minority of infected patients, i.e., peptic ulcer disease, both gastric and duodenal ulcers, and gastric cancer, namely, adenocarcinoma and mucosa associated lymphoid tissue (MALT) lymphoma (reviewed in [3]). Peptic ulcer disease rarely occurs soon after H. pylori infection [4][5][6][7][8] that generally starts in childhood; this presumably reflects marked differences in the virulence [9][10][11][12][13][14][15][16] and/or in the susceptibility of young patients [17][18][19].…”