Plague has returned to global headlines following a researcher’s fatal pneumonia in Siberia, prompting World Health Organization scrutiny. Although Yersinia pestis still circulates in wild animal reservoirs worldwide, European health authorities confirm that the modern risk remains very low, contrasting sharply with the historical devastation of the 14th-century Black Death.
One of humanity’s oldest diseases has returned to the news following the fatality of a 28-year-old lab employee at the Irkutsk Anti-Plague Research Institute located in Siberia has put one of humanity’s oldest diseases back in the headlines. Darya Shipilova died after developing severe pneumonia, triggering concern that she may have contracted plague. However, Russian authorities state that no plague cases are confirmed in connection with the incident, and tests performed on her contacts returned negative results. The World Health Organization has asked for further details and offered support to Russian officials, while European health authorities monitor the situation closely.
How Modern Medicine Defeats Yersinia Pestis
The bacterium responsible for the pandemic, Yersinia pestis, circulates naturally among small mammals and their fleas in parts of Africa, Asia, and the Americas. Between 2019 and 2025, the World Health Organization notes that the majority of human cases were concentrated in Madagascar and the Democratic Republic of the Congo.
At the RCSI University of Medicine and Health Sciences, Prof Steve Kerrigan serves as both Professor of Precision Therapeutics and Deputy Head for Research within the School of Pharmacy and Biomolecular Sciences. What makes Yersinia pestis particularly dangerous is its ability to interfere with our immune response. If the bacteria enter the bloodstream, septicaemic plague can develop. If they infect the lungs, the result is pneumonic plague. Transmission via airborne droplets distinguishes this form, allowing it to move directly between individuals similarly to respiratory viruses like common colds. The WHO warns that without prompt treatment it can kill within around 18 to 24 hours after symptoms begin.
- Bubonic plague: The most common variety, contracted via infected flea bites, causing fever and painful lymph node swellings known as buboes.
- Septicaemic plague: Occurs when bacteria multiply directly in the bloodstream.
- Pneumonic plague: Infects the lungs and poses transmission risks through respiratory particles.
What makes Yersinia pestis formidable is a type III secretion system that acts like a microscopic syringe, injecting proteins directly into immune cells to disrupt their defenses. Yet unlike medieval outbreaks, modern healthcare possesses robust tools. Early detection remains essential for survival, since antibiotics can eradicate the bacterium even though untreated Yersinia pestis infections remain exceptionally lethal.
Active Surveillance Across Europe and Spain
European health agencies maintain that local transmission has been absent for decades. According to the European Centre for Disease Prevention and Control, the disease has been absent from the continent for more than 50 years. Spain has not recorded locally acquired cases in decades, but maintains active epidemiological protocols. In April 2026, the country’s Public Health Commission updated its national protocol to revise case definitions and information-collection standards before the Siberian incident occurred. Active epidemiological monitoring of the illness persists in Spain, despite decades passing without any locally acquired cases.
International bodies emphasize that the Siberian laboratory death does not signal a continental resurgence. The European Commission placed the Russian incident on the agenda for its Health Security Committee meeting on October 7, while the European Centre for Disease Prevention and Control confirmed a lack of secondary cases or sustained person-to-person spread. On October 7, the European Union reviewed the Russian case, though international health officials continue waiting for details that might explain the researcher’s death.
Reconstructing Centuries of Plague DNA
While modern outbreaks are rare, genetic research reveals that the disease maintained a complex history long after the Black Death swept Europe between 1347 and 1353. A study analyzed ancient DNA from archaeological remains across England, Estonia, the Netherlands, Russia, and Switzerland to reconstruct 26 genomes of Yersinia pestis spanning the fourteenth to eighteenth centuries. Plague victims from Domat/Ems, Sogn Pieder (Switzerland) associated with the Plague of the Thirty Years’ War. Ranging from the fourteenth through the eighteenth centuries, these specimens encompass a substantial portion of the Second Plague Pandemic.
We were able to improve dating intervals for many samples, which allowed us to connect them to specific plague waves and outbreaks that were recorded in the respective towns or regions by chroniclers.
Professor Philip Slavin, historian and co-author, via Ac
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