Genetic diversity of bacteria in stomachs mirrors the early migration of modern humans

By analyzing strains of a common bacteria, H. pylori, found in the stomach of humans researchers have been able to trace and date migration of modern humans out of Africa and throughout the rest of the world. People in and around east Africa have the highest diversity of this species while the farther others live from east Africa, the lower the diversity is. This suggests that this bacteria originated in early humans.