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  • Researchers identified sheep pox virus DNA in medieval manuscripts and Bronze Age animal remains, extending the known history of the disease by centuries.
  • The presence of viral genetic material in parchment made from various animal skins suggests complex transmission routes or contamination during historical book production.
  • Analysis indicates the virus genome has remained stable over thousands of years, providing valuable data for managing modern livestock outbreaks in regions like Greece.

Scientists have uncovered genetic evidence of a deadly livestock virus preserved within medieval manuscripts and ancient animal remains, revealing that sheep pox has infected European herds for at least three and a half millennia. The discovery, detailed in recent research published in Science Advances, highlights the potential of historical archives to serve as unexpected repositories for understanding the long-term evolution of animal pathogens.

The study involved analyzing samples from historic documents held in major institutions including the University of Cambridge, Yale University, the Austrian National Library, and Lambeth Palace Library. These manuscripts date from the early eighth century to the 14th century C.E. and include significant works such as the York Gospels, the Corpus Glossary, an annotated copy of the Epistles of St. Paul, and sections of the Speculum Majus.

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Unexpectedly, researchers detected sheep pox virus DNA not only in parchment crafted from sheepskin but also in pages made from calf and goat skins, as well as paper. This finding implies either cross-species infections among livestock or viral contamination during the manufacturing process. The virus may have been introduced through animal-derived gelatin or glue, which were commonly used in that era to strengthen and smooth paper surfaces.

By combining manuscript data with genetic material recovered from sheep teeth found in Bronze Age pastoralist settlements in Russia and Central Kazakhstan, scientists pushed the known timeline of the virus back approximately two centuries. This evidence suggests the pathogen has been present since roughly 3,700 years ago, affecting livestock long before the medieval period.

The team successfully reconstructed twenty-one ancient sheep pox virus genomes spanning from approximately 1700 B.C.E. to 1917 C.E. Comparing these historical samples with modern variants allowed researchers to build a genetic family tree that illustrates how different lineages of capripoxviruses, including goat pox and lumpy skin disease virus, diverged from a common ancestor.

This divergence likely occurred between 11,500 and 3,700 years ago, coinciding with significant shifts in human behavior regarding the movement and management of livestock. The analysis further revealed that the sheep pox virus genome has exhibited remarkable stability over thousands of years, a characteristic that could inform strategies for combating the disease today.

The findings carry immediate relevance for contemporary agricultural challenges. Greece is currently managing an ongoing outbreak of sheep and goat pox, which has necessitated the culling of hundreds of thousands of animals to prevent further spread. Understanding the historical stability and evolution of the virus may assist veterinarians and policymakers in developing more effective containment measures.

Lead author Louis L’Hôte, a geneticist at University College Dublin, noted that archives and libraries worldwide might contain similar genetic traces of past animal disease outbreaks. This suggests that untapped historical resources could provide critical insights into the origins and progression of livestock pathogens, offering a new lens through which to view agricultural history.

The research underscores the intersection of paleogenomics and historical preservation. As scientists continue to explore these ancient records, they may uncover additional details about how diseases have shaped human societies and animal husbandry practices over millennia. The stability of the virus genome offers a promising avenue for future studies aimed at improving livestock health and food security.

While the study provides a clearer picture of the virus's long history, questions remain regarding the specific mechanisms of transmission in historical contexts. Whether the presence of viral DNA in non-sheep parchment results from direct infection or processing contamination requires further investigation. Nevertheless, the work establishes a robust framework for examining the deep history of animal diseases through cultural artifacts.

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  • Smithsonian Magazine↗The Ancient DNA of a Deadly Animal Virus Has Been Lurking in Medieval Manuscripts for Centuries, Researchers Find