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3d ago

Plague Hit Lake Baikal Hunter‑Gatherers 5,500 Years Ago

A Nature study shows ancient Yersinia pestis genomes carried a superantigen likely to raise lethality, with archaeological evidence linking spillover to marmot hosts.

An artist's reconstruction of hunter-gatherers in the vicinity of Lake Baikal in Siberia from about 5,500 years ago burying people who died of plague, seen in this image released on June 17, 2026. Kelvin Wilson/Handout via REUTERS
Plague DNA was recovered from an adolescent boy and girl found in the same grave in Siberia.
One of the shared graves included two young half sisters and an adolescent boy.
The skull of a hunter-gatherer woman estimated to have been 25-35 years old who was found to have been infected with plague and was buried in a grave excavated in the vicinity of Lake Baikal in Siberia dating to roughly 5,500 years ago, seen in this undated photograph released on June 17, 2026. Angela Lieverse/Handout via REUTERS

Overview

  • The Nature paper published June 17 reconstructed the oldest known Yersinia pestis genomes from teeth at four Lake Baikal cemeteries and detected plague DNA in 18 of 46 individuals.
  • Radiocarbon dating and genetic kinship analysis indicate two rapid outbreaks that appear clustered within families and include an unusually high share of children and young teens.
  • Genomic analysis found a previously unidentified superantigenic toxin gene in the ancient strains, which could trigger extreme immune reactions and help explain high mortality without flea transmission genes.
  • Archaeology and ecology point to Tarbagan marmots as the likely wild-rodent reservoir and the team infers spillover to people followed by probable direct respiratory or close-contact spread.
  • The finding pushes back the timeline for lethal plague to about 5,500 years ago and challenges the idea that farming and dense settlements were required for major Y. pestis outbreaks, with implications for how zoonotic pathogens can emerge.