Multiple Diseases Identified in Napoleon’s Retreat from Russia
Recent research has uncovered evidence of multiple diseases affecting Napoleon Bonaparte’s army during its disastrous retreat from Russia in 1812. By analyzing the DNA remains of soldiers found in a mass grave in Vilnius, Lithuania, experts identified two previously undetected types of bacteria contributing to the deaths, namely Salmonella enterica and Borrelia recurrentis, which are responsible for paratyphoid fever and relapsing fever, respectively, reports BritPanorama.
The retreat, marked by severe losses, is estimated to have decimated the French forces through a combination of combat, starvation, extreme cold, and disease. The findings broaden the understanding of the health crises faced by the army, previously thought to be primarily the result of a typhus epidemic, which was determined via 2006 research that first detected Rickettsia prowazekii in soldiers’ remains.
Lead author Rémi Barbieri emphasized the significance of the latest findings, stating, “Previously, we just thought that there was one infectious disease that decimated the Napoleon army — the typhus.” The new evidence suggests a more complex interaction of infectious agents, possibly indicating the presence of even more diseases that contributed to the army’s struggles.
The study utilized high-throughput sequencing technology, which facilitates the identification of degraded DNA, to analyze 13 samples from soldiers. Notably, the researchers did not detect typhus in these samples, but the results do not invalidate earlier findings; rather, they highlight the likelihood that various infectious diseases were present.
Research coauthor Nicolás Rascovan noted, “What changes (with) our study is the fact that now we have direct evidence there were several different infectious diseases present in this site.” He acknowledged the limitations of the sample size but indicated the potential for identifying additional pathogens as research continues to evolve.
These advancements in technology contribute not only to historical understanding but also to the broader landscape of infectious diseases today. As Cecil Lewis, a microbiome researcher, remarked, this research offers essential insights into how pathogens have historically impacted human society, providing a clearer perspective for anticipating future health threats.
While paratyphoid fever and relapsing fever remain present today, they are less common and less lethal than in the past. Ultimately, though Napoleon himself survived this tumultuous episode, the substantial losses incurred during the retreat significantly diminished his military power in subsequent years.
Notably, advancements in ancient DNA analysis now allow scientists to explore historical pathogens in ways that were once inconceivable, as Rascovan expressed anticipation for future discoveries enabled by ongoing technological development.
