Ancient DNA reveals how the plague kept returning for more than 400 years after the Black Death 🌍✨

Summary:
New research based on ancient DNA analysis has uncovered new details about the spread of the plague that swept through Europe in the period after the Black Death. It turns out that the plague did not disappear after the first catastrophic wave in the 14th century, but continued to reappear and evolve across multiple regions in Europe for more than four centuries. The study, which included samples from several European countries, established a documented genetic map of this epidemic and showed that human movement, wars, and climate changes all played a role in the spread of the plague.

Plague: More than one catastrophe in history 📸

The Black Death pandemic is known as one of the deadliest epidemics in history, having claimed millions of lives between 1347 and 1353. But what many people do not know is that the plague did not disappear after that. Instead, it reappeared many times over four centuries, affecting civilizations, economies, and social structures in Europe and beyond, as well as other nearby regions.

A global team of researchers, led by the University of Tartu (University of Tartu), studied archaeological human remains dating from the 14th to the 18th century. By analyzing the ancient DNA of the bacterium Yersinia pestis, which causes the plague, the scientists were able to trace the development and spread of the plague across time and space.

Riddles or myths: the plague does not stay in one place 🧭

One important discovery was that the plague was not confined to a single reservoir or a small area from which it continuously spread. Ancient genome analysis techniques showed that the bacterium appeared repeatedly in multiple places, such as Estonia, England, Russia, the Netherlands, and Switzerland, over the centuries.

The genes also revealed the existence of multiple genetic lineages of the bacterium, with major intersections and branches occurring between 1450 and 1500, suggesting the creation of new natural environments (reservoirs) in wildlife, such as rodents, that allowed the bacterium to survive and spread.

The plague and its relationship to climate: the impact of the Great Drought 🎭

The spread of some plague strains coincided with a drought period known as the “Great Renaissance Drought,” indicating that climatic factors played a role in plague outbreaks.

In current ecosystems, climate change is known to affect the behavior and habits of wild rodents, which are natural reservoirs for the bacterium. This suggests that harsh climate conditions may have increased the chances of the plague spreading and being transmitted among humans through its natural hosts.

More precise dating of plague outbreaks 📸

Determining when epidemics occurred in ancient history is a challenge, especially without exact dates like those available for modern diseases such as the coronavirus.

The researchers relied on advanced techniques to place the ancient samples on the bacterium’s evolutionary tree, which helped them narrow down the timeframes of different epidemics and link them to historical records.

In this way:

• They were able to connect the discovered genes to known plague outbreak events throughout history.
• The results of genetic analysis were combined with archaeological information to provide clearer pictures of the plague in each era.

Humans and wars: key factors in the spread of the plague 🌍

The study reveals a relationship between the plague and the major wars Europe experienced, such as the Thirty Years’ War (1618-1648) and the Great Northern War (around 1700-1721).

As armies, refugees, and traders moved along European routes, the bacterium moved with them, making the plague more widespread, especially in areas that witnessed military clashes.

A prominent example is the siege of Tallinn in 1710, where soldiers and military personnel from Swedish and Russian forces, as well as civilians, lost their lives, proving how wars affected the course of the disease.

Why is studying the ancient plague important today? 🧭

Although the plague ended as a widespread threat in Europe centuries ago, the bacterium Yersinia pestis still exists in scattered places around the world, hiding in natural reservoirs among wild rodents.

Understanding how the plague evolved and spread over time can provide scientists with important lessons about how we deal with modern epidemics and how to monitor diseases that may suddenly re-emerge.

A multidisciplinary research project and an opportunity for deeper understanding 📸

The research project that carried out this analysis brought together multiple fields, from archaeology and molecular biology to history. It included collaboration between different universities in Europe, such as the University of Cambridge and researchers in the Netherlands and Switzerland.

Thanks to the integration of:

• Ancient DNA analysis
• Historical records
• Radiocarbon dating

the researchers were able to draw a detailed picture of the plague during the period known as the Second Plague Pandemic.

Conclusion

The recent research shows that the plague was a persistent enemy of Europe for many centuries after the great tragedy of the Black Death. It was not a single epidemic but a complex phenomenon that emerged and evolved with human movements, climate changes, and conflicts.

These findings not only sparked scientific curiosity, but also provide new tools for understanding how epidemics remain active and recur throughout history, contributing to the advancement of modern epidemiological studies.

Thus, the story of the plague remains a vivid example of the interplay between nature, society, and history, and of how science continues to uncover the secrets of the past to light the way toward the future. ✨🌍

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