WHO Report Highlights Key Uncertainty Over Death of Russian Infectious Disease Researcher Darya Shipilova

The World Health Organization released a report on the death of a Russian infectious disease researcher, noting that Russia has not yet confirmed a cause of death. The researcher, identified by media as 28-year-old Darya Shipilova from the Irkutsk Antiplague Research Institute, fell ill on September 29. Early media reports suggested plague exposure from a broken test tube, but Russian health authorities stated she died of severe pneumonia of undetermined etiology after testing negative for high-threat pathogens.

Officials conducted 5,500 laboratory tests on contacts, identifying a few common infections like COVID-19 and rhinovirus, but no high-threat pathogens. According to the WHO, the absence of a confirmed etiological diagnosis—the underlying cause of the disease—leaves a key uncertainty that prevents health agencies from assessing the event's true risk.

Without a definite diagnosis, the UN agency cannot determine whether Russia's public health measures and seven-day contact monitoring period were adequate, nor can it completely rule out a laboratory-associated exposure. The WHO stated it has seen no evidence of ongoing transmission. Russian authorities maintain that no laboratory biosafety incident occurred and that the deceased worker was vaccinated against plague.