The ancient plague that may have cleared Europe for new settlers

Health · Published 18 October 2026 Swipe more like this →

In short: For centuries, the sudden demographic collapse of Neolithic farmers was a mystery. Was it crop failure or social strife? New genomic evidence suggests a more lethal culprit: an early form of the plague that may have decimated populations 5,000 years ago, paving the way for massive migrations.

From approximately 4,900 to 5,300 calibrated years before present (cal. bp), a major demographic collapse occurred throughout much of Europe, termed the Neolithic decline. bp), an era called the Neolithic decline. This period saw the cessation of megalith building and the abandonment of permanent settlements. While some scholars traditionally blamed agricultural crises or worsening environmental conditions, recent ancient genomics offer a biological explanation: the spread of Yersinia pestis.

Researchers analyzed DNA from 108 individuals in Scandinavia and Denmark, finding that at least 17% were infected with the plague at death. The study identified three distinct infection events occurring within a roughly 120-year window. Crucially, one specific strain showed evidence of 'reshuffled' genes and virulence factors associated with pneumonic plague—a deadly form transmitted via respiratory droplets rather than flea bites. This suggests the pathogen had high epidemic potential to spread rapidly through densely populated farming communities.

The timing of these outbreaks is significant. The population decline may have created a demographic vacuum, facilitating the expansion of Corded Ware people from the Eurasian steppes into Europe between 4800 and 4400 cal. bp. While some scientists argue that early plague cases were merely sporadic zoonotic events, the presence of widespread infections in specific kinship groups provides a compelling link between pathogen spread and the collapse of Neolithic social structures.

This research highlights how human lifestyle shifts—moving from hunting to high-density farming—created the perfect conditions for disease. By living in closer proximity to domesticated animals and each other, Neolithic humans inadvertently fostered environments where pathogens like Yersinia pestis could transition from isolated incidents into transformative historical events.

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