A Russian agency links the lab worker’s death to ‘pneumonia of unknown’ origin.
Published On 5 Oct 2026
An employee of a Russian anti-plague institute in the remote Siberian region of Irkutsk has reportedly died of a suspected pneumonic plague infection, according to a United States official.
“We are aware of reports of a fatal case of suspected pneumonic plague in Irkutsk Oblast, Russia. We are monitoring the situation closely with the CDC [Centers for Disease Control and Prevention] and our other interagency partners,” a State Department official told Al Jazeera
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“Many details have not been confirmed. We encourage Russian authorities to share accurate information quickly and openly,” the official said.
Alexei Tsydenov, the governor of the Buryatia region, said in a post on his Telegram channel on October 3 that a woman in the neighbouring Irkutsk region had “died, maybe of the plague”.
Russia’s official TASS news agency reported on Sunday that the country’s consumer watchdog, Rospotrebnadzor, said in a statement that an employee of the Irkutsk Anti-Plague Research Institute of Siberia and the Far East had been diagnosed with “pneumonia of unknown aetiology”.
The watchdog also said it expanded testing of samples from the patient and found no microorganisms associated with her professional activities.
Pneumonic plague is caused by the bacterium Yersinia pestis, usually found in small mammals and their fleas. According to the World Health Organization (WHO), the plague is highly infectious and can be fatal if not treated early.
Local media named the woman who died as 28-year-old laboratory technician Darya Shipilova.
Media reports say that authorities in Siberia’s Irkutsk region have placed nearly 200 people under medical observation.
