Lethal plague outbreaks in Lake Baikal hunter-gatherers 5,500 years ago

Analyses of ancient DNA from hunter-gatherers near Lake Baikal in southeast Siberia, dating to approximately 5,500 years ago, indicate the emergence of a highly virulent strain of Yersinia pestis. This finding suggests that the plague pathogen appeared significantly earlier than previously estimated and in a location geographically distant from the next known instances of infection, which occurred in Late Neolithic Europe. The research, published in Nature on June 17, 2026, utilized ancient DNA sequencing to identify the presence of Yersinia pestis in skeletal remains. This discovery challenges existing timelines for the spread of the plague and highlights the potential for early, isolated outbreaks in diverse geographical regions. The implications of this finding extend to our understanding of pathogen evolution and the historical dynamics of infectious disease transmission across ancient populations. Further research may explore the specific adaptations of this early Yersinia pestis strain and its potential impact on the hunter-gatherer communities of Siberia.