Shelekhov / Irkutsk, Siberia — October 5, 2026: A 28-year-old laboratory technician at Russia’s Irkutsk Anti-Plague Research Institute of Siberia and the Far East has died after developing severe pneumonia, sparking widespread concern, medical observation of nearly 200 contacts, and temporary quarantines at several local hospitals.
The woman, identified in Russian media as Darya (also spelled Daria) Shipilova, worked at the specialized institute in the town of Shelekhov, near Irkutsk. Independent regional reports, including from the outlet Lyudi Baikala (People of Baikal), stated that she accidentally broke a test tube containing live Yersinia pestis the bacterium that causes plague on September 25 while handling samples.
She was admitted to hospital in Shelekhov on September 29 with severe pneumonia symptoms and was placed on a ventilator. She died in the early hours of October 2 (or overnight between October 1 and 2, according to varying accounts).
Russian federal health watchdog Rospotrebnadzor has officially described the cause of death as “pneumonia of unknown etiology” (or “unknown origin”). The agency stated that expanded testing found no microorganisms linked to her professional duties and insisted that no laboratory accident involving pathogenic microorganisms occurred at the institute. Officials have repeatedly described the overall sanitary and epidemiological situation in the Irkutsk region as stable.
Despite the official stance, precautionary measures were swiftly implemented. Nearly 200 people who had contact with Shipilova were identified and placed under medical observation, with many in hospital settings. Several hospitals in the area were reported to have been placed under quarantine restrictions, and the nearby Irkutsk Aluminum Plant introduced a mask mandate for staff. Staff at the anti-plague institute itself were also isolated as a precaution.
The governor of the neighboring Buryatia region, Alexei Tsydenov, initially posted that Shipilova had died of plague before editing the statement to say she “possibly” died of the disease, while stressing there was no outbreak in his region. Irkutsk Governor Igor Kobzev held emergency meetings with public health officials and later affirmed that the situation remained under control.
The incident has drawn international attention. U.S. authorities confirmed they are monitoring reports of a possible pneumonic plague case linked to the laboratory. Pneumonic plague, the respiratory form of the disease caused by Yersinia pestis, can spread between people through respiratory droplets and is considered more dangerous than the more common bubonic form, though modern antibiotics are effective if administered early.