Ancient DNA reveals plague was already killing humans 5,500 years ago

Genetic analysis of ancient human remains has confirmed that plague was already infecting humans 5,500 years ago, long before the well-documented outbreaks of later centuries. This discovery, announced by researchers studying ancient DNA, significantly extends the known timeline of plague’s impact on human populations and provides new insights into the disease’s early evolution.

Scientists examined DNA extracted from human skeletal remains found in Eurasian archaeological sites dating back approximately 5,500 years. The analysis identified genetic markers associated with Yersinia pestis, the bacterium responsible for plague. These markers indicate that the disease was already capable of infecting humans at this early date.

Researchers from the Max Planck Institute for the Science of Human History and collaborating institutions published their findings in the journal Nature Communications. The study confirms that plague was present in human populations during the late Neolithic period, predating the first historically recorded pandemics by several millennia.

While the exact severity and impact of the disease at that time are still under investigation, the presence of Yersinia pestis suggests that the pathogen had already begun its long association with humans, potentially influencing migration and social structures of early communities.

Implications for Understanding Disease Evolution

This discovery reshapes the timeline of plague’s history, showing it affected humans much earlier than previously believed. Understanding when plague first emerged in human populations can inform studies on the evolution of infectious diseases and their long-term effects on human history. It also raises questions about how early societies managed or were affected by such diseases, which could influence interpretations of prehistoric social dynamics.

Early Evidence of Disease in Prehistoric Populations

Prior to this study, the earliest confirmed cases of plague in humans were associated with the Bronze Age, approximately 3,000-4,000 years ago. Archaeological evidence of plague outbreaks, such as mass burials and skeletal lesions, had been linked to later periods. The new findings push the timeline back by over a thousand years, indicating that the disease was present during the late Neolithic period.

Ancient DNA analysis has increasingly become a vital tool for uncovering the history of infectious diseases. Previous studies have identified early strains of Yersinia pestis in Bronze Age remains, but this is the first direct genetic evidence from remains dating back 5,500 years.

This research also complements existing evidence that early humans encountered various pathogens, shaping their health and migration patterns long before written records.

“Our findings demonstrate that plague was already affecting humans 5,500 years ago, which is much earlier than previously thought. This changes how we understand the origins and spread of this deadly disease.”

— Dr. Johannes Krause, lead researcher

Uncertainties About Early Disease Impact

While the presence of Yersinia pestis has been confirmed, it remains unclear how widespread or deadly the disease was among these early populations. The extent to which it caused outbreaks, social disruption, or population decline during this period is still under investigation. Additionally, the precise transmission methods and environmental factors facilitating its early spread are not yet fully understood.

Future Research on Early Plague Dynamics

Researchers plan to analyze additional ancient remains from different regions and periods to map the early spread of plague. Further genetic studies aim to understand how the pathogen evolved over time and its relationship to later pandemics. Interdisciplinary efforts combining archaeology, genetics, and anthropology will continue to shed light on how early humans coped with infectious diseases, including plague.

Key Questions

How do scientists know the plague was present 5,500 years ago?

Scientists analyzed ancient DNA extracted from human skeletal remains, identifying genetic markers specific to Yersinia pestis, the bacterium that causes plague.

Does this mean plague was causing pandemics at that time?

It is not yet clear how widespread or severe the disease was during this period. The presence of the bacteria indicates infection was possible, but the scale of its impact remains unknown.

What does this discovery tell us about early human societies?

It suggests that infectious diseases like plague may have influenced migration, social organization, and population dynamics long before recorded history.

Will this change how we view the history of pandemics?

Yes, it extends the timeline of plague’s existence, prompting a reevaluation of the origins and evolution of infectious diseases affecting humans.

Source: rss