Experts examined samples of the stomach bacterium Helicobacter pylori, which is associated with human
Early studies discovered three populationsH. pylori bacteria in individuals in Eurasia and America. The data also indicated that one of these bacterial populations, including Native American H. pylori, was distributed throughout Siberia. It is assumed that this population came with people to America.
H.pylori is a stomach bacterium that infects about half of people worldwide, but scientists have found that its genetic sequence also varies depending on the region in which it is identified.
To reconstruct the history of human movements, the authors compared evolutionary models and time intervals using a method called approximate Bayesian computation (ABC).
The results showed that a tiny population of H. pylori colonized America in a single migratory event approximately 12,000 years ago.
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