Ancient Plague Insights From Bronze Age Sheep Discovery
A significant discovery sheds new light on how a version of the plague spread long before the infamous Black Death swept through Europe in the Middle Ages. Researchers have found DNA from the plague bacterium, Yersinia pestis, in the tooth of a domesticated sheep that lived more than 4,000 years ago in what is now southern Russia. This finding is a vital piece of the puzzle in understanding the plague’s spread during the Bronze Age, which lasted from about 3300 to 1200 B.C.
According to a recent study published in the journal Cell, this is the first evidence suggesting that ancient animals, not just humans, were affected by this plague. The discovery came as a surprise to researchers like Taylor Hermes from the University of Arkansas, who noted that recovering this ancient DNA was a groundbreaking moment for their team.
“The ability to extract the genome from a non-human sample is a big first for us,” Hermes stated. This research is crucial as it highlights how livestock and possibly other animals interacted with humans, influencing the spread of diseases at that time.
The genetics involved in analyzing ancient samples are complex. Researchers often face difficulties in isolating tiny fragments of DNA from the contamination of soil and microbes. The fragments they recover from ancient remains are usually small, making the process challenging. Hermes emphasized that understanding ancient livestock can reveal a lot about the diseases that might have infected those animals and their human caretakers.
The findings suggest that disease spread occurred through close interactions between humans, livestock, and wild animals. During the Bronze Age, people began to herd larger groups of animals and travel more significantly, facilitating the movement of diseases. This period also saw advanced tools and increased travel, which further raised the risks of disease transmission.
When the plague re-emerged in the 1300s, it led to the Black Death, which killed about one-third of Europe’s population. The recent study indicates that livestock like sheep likely caught the bacteria from other animals, potentially rodents or migratory birds, passing it on to humans without getting sick themselves.
Hermes remarked on the importance of respecting nature’s forces in light of these discoveries. However, the research is based on a single ancient genome, which means there’s still much to learn, and more samples are necessary for a fuller understanding.
The researchers plan to investigate more ancient animal and human remains from the region to determine the extent of the plague’s spread and discover which species may have played a role. This research could provide insight into how animal-borne diseases continue to emerge in today’s world.
The study was led by scientists from the Max Planck Institute for Infection Biology and involved collaboration with experts from Harvard University. Such breakthroughs remind us of the intricate relationship between humans and the wildlife around them, a connection that has implications for public health even today.
