Everyone assumed the earliest plague strains were mild precursors to the Black Death — ancient DNA from Siberian children's graves just rewrote 5,500 years of disease history

Recent research on ancient DNA from hunter-gatherer remains near Lake Baikal in East Siberia challenges the prevailing assumption that early plague strains were mild precursors to the Black Death. The study revealed that Yersinia pestis, the bacterium responsible for the plague, was present as a potential mass killer in prehistory, showing a high proportion of individuals carrying DNA evidence of infection. This suggests that even without efficient flea-borne transmission, ancient Siberian strains possessed virulence factors that made the infection devastating.

The findings shed light on how zoonotic pathogens, such as Yersinia pestis, shaped small communities long before the emergence of cities and trade routes. The study highlights the conditions under which most new human diseases still emerge, emphasizing the importance of understanding the deep history of infectious outbreaks for current research on emerging diseases. Further studies in other regions of Central and North-East Asia are needed to expand our understanding of the longer arc of human disease history.