Siberian lab worker dies after reported plague exposure; ~200 under observation

Darya Shipilova, a 28-year-old laboratory assistant at the Irkutsk Research Anti-Plague Institute, died in the early hours of October 2, 2026, in the intensive care unit of the district hospital in Shelekhov, a town near Irkutsk in Siberia, according to the Moscow Times and Euronews.

Colleagues and local media reports cited by the Moscow Times and Newsweek say Shipilova broke a test tube containing live plague bacteria, Yersinia pestis, while collecting samples on September 25. Euronews reported that her condition worsened two days later, and the Moscow Times reported she was hospitalized with severe pneumonia symptoms, placed on mechanical ventilation, and died on October 2.

What officials have and have not confirmed

Russia's consumer health watchdog, Rospotrebnadzor, has not officially confirmed that plague caused Shipilova's death. Euronews reported that authorities listed her diagnosis as "pneumonia of unknown aetiology" after further testing, rather than confirming pneumonic plague — the lung-based form of the disease that can spread between people through respiratory droplets.

Newsweek reported that Rospotrebnadzor denied any accident had occurred at the institute, even as police opened a criminal investigation into possible health and safety violations, according to the Moscow Times.

Quarantine and hospital closures

Regional governor Igor Kobzev said all identified contacts of Shipilova had been placed under medical observation and that their test results were negative for illness, the Moscow Times reported. Newsweek put the number of people under observation at roughly 197, including more than 100 held in hospital wards, while the Moscow Times described the figure as nearly 200.

Euronews reported that multiple hospitals in the Irkutsk region were placed under three-week quarantine with visitor restrictions. Newsweek specified that four Irkutsk hospitals were closed on this basis. Euronews also reported that a nearby aluminium plant made masks mandatory as a preventive measure, and that protective equipment was distributed in local kindergartens.

Public events in Irkutsk were canceled as part of what authorities called anti-epidemic measures, the Moscow Times reported. Alexei Tsydenov, a regional leader, said there were no signs of outbreak in the neighboring republic of Buryatia.

Background on the institute and the region

The Irkutsk Anti-Plague Institute studies and stores highly dangerous pathogens, including plague, as part of surveillance work tied to natural plague foci in Siberia and neighboring regions. Euronews cited Russian epidemiologist Gennady Onishchenko as saying that rodent carriers of plague typically enter winter dormancy in Siberia by early October.

Plague is caused by the bacterium Yersinia pestis. Newsweek described the pneumonic form, which affects the lungs, as the most virulent form of the disease and said it can be transmitted between people through respiratory droplets. Newsweek reported that the World Health Organization recorded close to 4,000 suspected plague cases worldwide between 2019 and 2025, with most occurring in Africa, particularly the Democratic Republic of Congo and Madagascar.