's historical journey through Siberia and the Americas.

The gastric bacterium shares a coevolutionary history with humans that predates the out-of-Africa diaspora, and the geographical specificities of populations reflect multiple well-known human migrations. We extensively sampled from 16 ethnically diverse human populations across Siberia to help resolve whether ancient northern Eurasian populations persisted at high latitudes through the last glacial maximum and the relationships between present-day Siberians and Native Americans. A total of 556 strains were cultivated and genotyped by multilocus sequence typing, and 54 representative draft genomes were sequenced.

Recent acquisition of Helicobacter pylori by Baka pygmies.

Both anatomically modern humans and the gastric pathogen Helicobacter pylori originated in Africa, and both species have been associated for at least 100,000 years. Seven geographically distinct H. pylori populations exist, three of which are indigenous to Africa: hpAfrica1, hpAfrica2, and hpNEAfrica.

Helicobacter pylori Infection, Intestinal Metaplasia, and Gastric Cancer Risk in Eastern Siberia.

Background: The incidence of gastric cancer (GC) is extremely high in Russia and eastern Siberia, where information on the epidemiology of Helicobacter pylori infection is fragmentary.

Aims: To assess the prevalence of both H. pylori infection (including CagA status) and intestinal metaplasia (IM) in Russian and eastern Siberian populations carrying a different risk of GC.

The peopling of the Pacific from a bacterial perspective.

Two prehistoric migrations peopled the Pacific. One reached New Guinea and Australia, and a second, more recent, migration extended through Melanesia and from there to the Polynesian islands. These migrations were accompanied by two distinct populations of the specific human pathogen Helicobacter pylori, called hpSahul and hspMaori, respectively.