Ancient Plague DNA Found in Siberian Graves
Researchers identified a 5,500-year-old strain of the plague, pushing back the earliest known outbreak by two centuries.
Updated on Oct. 5, 2026 in Life Sciences
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Scientists have identified ancient DNA from the bacterium Yersinia pestis in the teeth of 18 hunter-gatherers buried near Lake Baikal, Siberia. Dated to 5,500 years ago, this evidence shifts the known origin of the plague 200 years earlier than previous estimates.
Why it matters
Understanding the early evolution of Yersinia pestis clarifies how the pathogen transitioned from animal hosts to humans long before the 14th-century Black Death. This research highlights the long-term interaction between nomadic groups and zoonotic diseases.
Genetic analysis of remains from four burial sites near Lake Baikal revealed a prehistoric strain of Yersinia pestis containing traits absent in modern variants. The bacterium likely spread from marmots to humans through consumption of raw organs or contact with infected hides.
The players
University of Copenhagen
A research institution focused on evolutionary biology and ancient DNA analysis.
The details
Researchers performed carbon dating on bones and extracted ancient DNA from remains found in four burial sites near Lake Baikal to determine the timeline of the infections. The pathogen initially moved from marmots—large ground squirrels native to the region—into small hunter-gatherer families, spreading between people through coughing and sneezing. The study demonstrates that the plague developed in stages, exhibiting distinct genetic features that differentiate it from the version responsible for the 14th-century Black Death.
Timeline
5,500 years ago: The earliest known plague outbreak occurred.
14th century: The Black Death impacted the European population.
1993: A photograph of the grave site near Lake Baikal was captured.
June 17, 2026: An image of the excavated grave was released to the public.
October 2026: The research findings were published.
The Tech Race
This finding extends the historical record of Yersinia pestis far beyond the well-documented 14th-century Black Death. It establishes a new baseline for pathogen evolution that researchers must now reconcile with prior models of disease spread across Eurasia.
This research provides historical context for zoonotic diseases rather than affecting current public health protocols. It serves as a foundational study for evolutionary biologists tracing how specific pathogens adapt to new hosts over thousands of years.
The takeaway
The study confirms that the plague has been a human pathogen for at least 5,500 years, requiring a reevaluation of prehistoric migration and social interaction. Watch for further comparative genomic studies that map how the bacterium gained its modern virulence.
Further reading
Explore more findings in Life Sciences.
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