" a bacterium named H. pylori that can cause ulcers. The bacterium may provide a clue to human migration patterns, for it is an Asian strain, and not the more usual Asian-African hybrids present in today’s European population. This discovery suggests that the additional migrations that brought African strains to Europe had not yet taken place by Ötzi’s time. "

― Eric H. Cline , Three Stones Make a Wall: The Story of Archaeology