Early Plague Hits Lake Baikal Hunters 5, 500 Years Ago

Scientists have found evidence that a deadly disease struck hunter‑gatherers near Lake Baikal in Siberia about 5, 500 years ago. The bacteria responsible was an early form of Yersinia pestis, the same species that caused later pandemics. However, these ancient strains did not yet have all the tools needed to spread as the bubonic plague does today, so their exact danger level was uncertain. Researchers examined four burial sites and discovered that nearly 40 % of the remains showed signs of plague infection. By mapping family relationships, they saw that the disease jumped from one small group to another, suggesting person‑to‑person transmission. The first wave of illness seems to have hit a whole generation at once, killing many children between eight and eleven years old.

The genetic analysis revealed differences in a gene called ypm that acts like a superantigen. This same gene is found in the modern bacterium Yersinia pseudotuberculosis, hinting that the ancient plague strains branched off from a common ancestor before 5, 700 years ago. The findings push back the known start of plague outbreaks and prove that they were lethal even in pre‑agricultural societies. These results challenge the idea that only densely populated, farming communities could experience plague. The Siberian hunter‑gatherers lived far from the Late Neolithic Europe where most early epidemics were thought to arise. Their experience shows that dangerous pathogens can emerge in any human group, regardless of lifestyle or population size.

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