Science
Oldest known plague outbreak killed hunter-gatherer children
TH
Thomas Green
3 weeks ago7 min read
DNA evidence extracted from ancient human remains has revealed that the oldest known plague outbreak struck a community of hunter-gatherers in Siberia more than 5,000 years ago, long before the rise of farming or large settled populations. The discovery, published in the journal Nature, challenges the long-held assumption that major infectious disease epidemics only emerged after the Neolithic Revolution, when humans began living in dense agricultural settlements. Instead, the findings suggest that even small, mobile bands of foragers were vulnerable to devastating outbreaks of Yersinia pestis, the bacterium responsible for the plague.The research team, led by scientists from the University of Copenhagen and the Max Planck Institute for Evolutionary Anthropology, analyzed DNA from the teeth and bones of seven individuals buried at a site called Lake Baikal in eastern Siberia. The remains date to around 5,400 years ago, making them the earliest known victims of plague. Strikingly, two of the infected individuals were children, indicating that the disease did not spare the youngest members of the community. The strain of Yersinia pestis identified in the samples is an ancient lineage that predates the more virulent forms that caused the Black Death in medieval Europe, but it already carried key genetic adaptations for flea-borne transmission.This finding upends the conventional narrative that plague and other crowd diseases only became possible after the advent of farming, which allowed human populations to grow dense enough to sustain continuous transmission. The Siberian hunter-gatherers lived in small, dispersed bands, yet the bacterium managed to spread and kill multiple individuals. The researchers speculate that the outbreak may have been a single, catastrophic event that wiped out a significant portion of the group, rather than an endemic disease. The presence of the plague bacterium in multiple individuals from the same burial site strongly suggests a common source of infection, possibly from a rodent reservoir or through direct contact with infected animals.The ancient strain of Yersinia pestis lacked the gene for the protein Ymt, which enables the bacterium to survive in the gut of fleas and thus be transmitted via flea bites. This means the earliest form of plague was likely spread through direct contact with infected animals or through respiratory droplets, similar to how pneumonic plague spreads today. The absence of flea-borne transmission would have limited the scale of outbreaks, but it also meant that the disease could still be lethal in small communities. The study provides a rare glimpse into the health challenges faced by prehistoric hunter-gatherers, who are often assumed to have lived relatively disease-free lives compared to later agriculturalists.The implications of this research extend beyond archaeology. Understanding the evolutionary history of Yersinia pestis helps scientists track how pathogens adapt to new hosts and environments, which is crucial for predicting future pandemics. The ancient Siberian strain represents an early stage in the bacterium's evolution toward the highly efficient flea-borne transmission that later enabled the Black Death to kill tens of millions of people in Europe, Asia, and North Africa. The study also underscores the importance of ancient DNA analysis in revealing hidden aspects of human history, including the role of infectious diseases in shaping population dynamics long before written records.Looking ahead, the researchers plan to search for more ancient plague genomes from other prehistoric sites to map the spread of the bacterium across Eurasia. They hope to determine whether the Lake Baikal outbreak was an isolated event or part of a broader pattern of early plague epidemics. The findings also raise new questions about how hunter-gatherer societies responded to such crises, including possible burial practices and social disruptions. As more ancient genomes are sequenced, scientists may uncover a hidden history of disease that predates civilization itself, forcing a revision of the timeline of human-pathogen coevolution.
#lead focus
#plague
#ancient DNA
#archaeology
#Yersinia pestis
#Siberia
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