Oldest evidence of plague outbreak found in prehistoric graves, rewriting the disease’s history

In a groundbreaking discovery that reshapes our understanding of humanity's relationship with infectious diseases, scientists have uncovered the earliest known evidence of a plague outbreak in prehistoric graves located in Siberia. This revelation comes from a study recently published in *Nature*, which highlights the presence of the bacterium responsible for the plague—*Yersinia pestis*—in the remains of children dating back approximately 5,500 years. These findings challenge long-held assumptions about the origins and evolution of one of the deadliest diseases in human history.

The graves, situated along the banks of the Angara River, contain the remains of multiple generations of hunter-gatherers. Alongside these skeletal remains, archaeologists unearthed artifacts such as arrowheads, providing further insight into the daily lives of these early inhabitants. Genetic analysis conducted on the teeth of the skeletons revealed that nearly 40% of them carried traces of *Yersinia pestis*. Among these remains, one particularly significant grave held three children—two of whom were identified as half-sisters aged between 9 to 10 and 5 to 6 years, respectively. The third child, a boy aged 11 to 12, was not closely related to the others but was buried simultaneously and also tested positive for plague DNA. Another grave contained a group of young girls, possibly cousins or sisters, all of whom showed signs of the disease.

This discovery marks the first time that evidence has suggested an outbreak of plague among prehistoric populations rather than isolated cases. Previously, a study had identified a single case of plague in a hunter-gatherer who lived around 5,000 years ago in modern-day Latvia, but no indication of an outbreak or human-to-human transmission was found. The current study, led by Ruairidh Macleod of the University of Oxford, indicates that the disease was not only present but had a severe impact on these communities, particularly affecting children.

The implications of this finding extend beyond just the timing of the disease's appearance. Historically, the emergence of plague and other infectious diseases has often been linked to the Neolithic Revolution—the transition from nomadic hunter-gatherer lifestyles to settled agricultural communities. This shift brought humans closer to domesticated animals, increasing the risk of zoonotic diseases spreading. However, the recent study challenges this narrative by suggesting that the plague might have originated in hunter-gatherer communities living near wild animals that harbored the bacteria.

Nicolás Rascovan, an expert in ancient DNA from the Institut Pasteur in Paris, emphasized that the study provides clear evidence of an outbreak during prehistoric times, arguing that it contradicts the idea that agriculture was the primary driver of plague emergence. According to Eske Willerslev, an evolutionary geneticist at the University of Copenhagen, the findings reveal that life as a hunter-gatherer was far more perilous than previously believed, with repeated encounters with deadly pathogens like the plague.

The bacterium identified in the study, *Yersinia pestis*, is the same species responsible for the devastating Black Death that ravaged Europe in the 14th century. However, the researchers believe that the strain found in these ancient remains had not yet developed the characteristics that made later outbreaks so virulent. Despite this, the impact on the community was profound, with multiple children dying in quick succession, indicating a severe outbreak.

As scientists continue to analyze the data, the broader implications of this discovery remain under discussion. Researchers are now looking to understand how the disease spread within these communities and whether similar patterns exist elsewhere in the world. The study opens up new avenues for exploring the complex interplay between human societies and infectious diseases throughout history. With each new piece of evidence, our understanding of the past continues to evolve, revealing a world where even the most primitive human societies faced threats from pathogens that would shape the course of civilization.