Researcher dies at Russian plague laboratory in Siberia after suspected accident

A 28-year-old laboratory technician, Daria Shipilova, has died in Siberia after reportedly breaking a test tube containing live plague bacteria at the Irkutsk Anti-Plague Institute. The incident has triggered a strict quarantine, placing nearly 200 contacts under medical observation and isolating the Shelekhov district hospital. While regional officials initially avoided confirming the plague diagnosis, sparking cover-up accusations and local panic, public health agency Rospotrebnadzor maintains the situation is stable and attributes the death to pneumonia of unknown cause.

Circumstances of Daria Shipilova's death

• ▪Daria Shipilova reportedly told medical staff she accidentally broke a test tube containing live plague bacteria while collecting samples at the Irkutsk Anti-Plague Institute.
• ▪Rospotrebnadzor stated on October 4, 2026, that Daria Shipilova died of pneumonia of unknown etiology and that testing did not reveal microorganisms related to her professional work.
• ▪Daria Shipilova, a 28-year-old laboratory technician at the Irkutsk Anti-Plague Institute, died on October 2, 2026, after being hospitalized with severe pneumonia-like symptoms.

Characteristics of pneumonic plague

• ▪Pneumonic plague is a highly contagious lung infection caused by the bacterium Yersinia pestis that can transmit directly between humans through respiratory droplets.
• ▪Pneumonic plague has a high fatality rate and develops rapidly, but it is treatable with antibiotics if detected early.

Quarantine and precautionary measures

• ▪The Irkutsk Aluminum Plant in Shelekhov instructed its staff to wear masks as a precautionary measure.
• ▪The Shelekhov district hospital was placed under quarantine, suspending lab tests and halting the admission or release of patients.
• ▪Russian authorities placed approximately 200 people who had contact with Daria Shipilova under medical observation, with over 100 monitored in hospital wards.

Official response and cover-up allegations

• ▪The head of the neighboring Buryatia region, Alexei Tsydenov, initially stated that Daria Shipilova died of plague, but his statement was later amended to more cautious wording.
• ▪Epidemiologist Mikhail Favorov disputed the broken test tube explanation, calling it laughable and suggesting the involvement of Rospotrebnadzor head Anna Popova indicated a serious cover-up.
• ▪Irkutsk Governor Igor Kobzev and other regional officials initially avoided using the word plague, referring to the situation as a suspected case of a particularly dangerous infection.

Global and regional plague context

• ▪Southern Siberia and Mongolia contain natural plague reservoirs in marmot populations, making regional plague occurrences rare but regular.
• ▪The World Health Organization reported nearly 4,000 suspected plague cases globally between 2019 and 2025, with most cases occurring in the Democratic Republic of the Congo and Madagascar.

Debatable claims

• ▪Russian officials should use the word 'plague' immediately when a case is suspected
• ▪Rospotrebnadzor's official explanation of Daria Shipilova's death is credible
• ▪Research on live plague strains in anti-plague institutes poses an unacceptable public safety risk