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7h ago

5,500‑Year‑Old Plague Killed Lake Baikal Hunter‑Gatherers, Study Finds

Genome, radiocarbon and burial evidence show ancient Yersinia pestis caused rapid, family‑clustered outbreaks without flea transmission, changing how scientists view early plague emergence.

Plague DNA was recovered from an adolescent boy and girl found in the same grave in Siberia.
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
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

  • A Nature paper published June 17, 2026 reconstructed the oldest known plague genomes from teeth and detected Yersinia pestis DNA in 18 of 46 individuals from four Lake Baikal cemeteries.
  • Radiocarbon dating and family relationships in the graves indicate two separate outbreaks beginning about 5,500 years ago and that many deaths occurred in a short span among siblings and parents with children disproportionately affected.
  • Genomic analysis shows these ancient strains lacked the ymt gene needed for flea‑borne bubonic spread but carried a previously unseen superantigen gene that can trigger extreme immune responses and likely raised lethality.
  • Archaeological finds and the region’s ecology point to marmots as the most likely wild‑rodent reservoir, with initial spillover from butchery or handling followed by probable human‑to‑human respiratory transmission.
  • The study pushes back the earliest confirmed plague outbreaks by roughly 200 years, narrows the bacterium’s early evolution window, and changes models of zoonotic emergence without implying new immediate public‑health risks.