Unraveling the Dark History of Sheeppox: Lessons from Medieval Manuscripts

Medieval manuscripts have long been regarded as valuable sources of historical information, but they also hold a darker secret. These ancient documents can serve as “biological time capsules” for the sheeppox virus, which has afflicted Eurasian sheep herds for at least 3,500 years.

The earliest written evidence of sheeppox outbreaks dates back to the first century CE, with Roman accounts describing skin lesions on sheep. Over time, agricultural texts and accounting documents from France, Spain, and England recorded frequent deadly outbreaks of “pustules” or “variola.” These records show a decline in outbreaks in 17th-century France, only to see them re-emerge with high mortality rates in the following centuries.

The study published in Science Advances reveals a complex and disturbing history of sheeppox outbreaks. The persistence of this virus for millennia should give us pause when we think about the ease with which diseases can spread today. In an era where global travel and trade have increased exponentially, it’s crucial to revisit the lessons of history and acknowledge the resilience of pathogens.

Co-author Louis L’Hôte notes that “archives and libraries around the world may also contain genetic traces of disease outbreaks in animals in the past.” This raises questions about the role of preservation and conservation efforts in understanding our collective history with infectious diseases. The sheeppox virus is a stark reminder that some historical plagues are far from eradicated.

The study’s findings underscore the importance of interdisciplinary research, combining paleopathology, genetics, and historical records to shed new light on a long-forgotten chapter in human history. This approach serves as a model for how we can better understand the complexities of infectious disease and develop more effective prevention strategies.

The discovery that medieval manuscripts contain preserved DNA of the sheeppox virus is a sobering reminder that our understanding of infectious disease is still evolving. As we continue to uncover new insights into the history of human health, it’s essential to remain vigilant in monitoring animal populations for signs of disease and to draw on the lessons of history to inform our strategies for controlling outbreaks.

The persistence of sheeppox across millennia should give us pause when we think about the ease with which diseases can spread today. As we grapple with the complexities of modern medicine and public health, it’s essential to draw on the lessons of history to inform our strategies. The dark history of sheeppox serves as a stark reminder that some historical plagues are far from eradicated – and that we must remain vigilant in monitoring animal populations for signs of disease.