Plague Outbreak Linked to Ancient Siberian Hunter-gatherers

WHO:

Ars Technica - Ruairidh Macleod, an ancient DNA researcher from the University of Oxford, and his colleagues conducted the study.

WHAT:

Ars Technica - Plague swept through groups of hunter-gatherers, resulting in dozens of deaths.

Science Daily - Researchers found early plague strains in nearly 40% of the individuals studied from ancient cemeteries.

Science Daily - Evidence of rapid family-based outbreaks was discovered, which wiped out many children and young teenagers.

WHERE:

Ars Technica - The study focused on four ancient cemeteries around Russia’s Lake Baikal in southeastern Siberia.

WHEN:

Ars Technica - The plague outbreak occurred 5,500 years ago, making it the earliest known outbreak of plague.

WHY:

Ars Technica - The findings challenge the assumption that plague outbreaks were primarily linked to the conditions created by farming and settled communities.

Ars Technica - Macleod stated that the accepted theory suggested infectious diseases could not devastate entire communities of hunter-gatherers due to their mobility and small group sizes.

HOW:

Ars Technica - Researchers sequenced DNA from Yersinia pestis bacteria found in the teeth of plague victims.

(UPDATED June 18, 2026 18:03 UTC)

A groundbreaking study led by Ruairidh Macleod from the University of Oxford has revealed that an early outbreak of plague swept through hunter-gatherer groups around Russia’s Lake Baikal 5,500 years ago, resulting in numerous deaths, particularly among children and young teenagers. Researchers discovered early strains of the plague in nearly 40% of individuals from ancient cemeteries and found evidence of rapid family-based outbreaks, challenging the long-held belief that such diseases primarily affected settled farming communities. By sequencing DNA from Yersinia pestis bacteria found in the teeth of plague victims, the study provides new insights into the impact of infectious diseases on mobile hunter-gatherer societies.