For most of a day, the officials in charge of Russia’s Irkutsk region chose their words carefully. On 2 October 2026 the regional governor, Igor Kobzev, spoke of “a particularly dangerous infection” and promised that “the situation is under strict control.” For the first 24 hours, neither he nor the regional authorities used the word “plague.”
The woman at the centre of the story was Darya Shipilova, a 28-year-old laboratory assistant at the Irkutsk Research Anti-Plague Institute, where she worked with dangerous pathogens. She died in intensive care at the district hospital in Shelekhov, a town near the regional capital. Local media reported that she had broken a test tube containing the plague pathogen. According to early reports, she told medical staff that the accident happened while she was collecting samples for testing. She was taken to hospital with symptoms of severe pneumonia and put on a ventilator. The Kyiv Independent reported that the tube held the pathogen that causes pneumonic plague.
That detail matters. Plague is caused by the bacterium Yersinia pestis, and the pneumonic form, which infects the lungs, usually passes from person to person through the air when someone coughs. Its first signs look just like other respiratory illnesses, and without quick treatment it is almost always fatal. People who have been exposed can be given preventive medication.
So it became urgent to find out who had been near her. By 2 October at least 197 people who might have had contact with her were under medical observation, and the Shelekhov hospital was put under quarantine.
While Irkutsk officials stayed vague, a politician next door did not. Alexei Tsydenov, head of the neighbouring republic of Buryatia, said that the woman had died of plague and that her infection had nothing to do with his republic. “There are no plague outbreaks in the republic, including in areas bordering Mongolia,” he wrote on social media. Later, his statement was changed to more cautious wording. On 3 October the authorities in Baikalsk told residents not to travel to Shelekhov because of plague, then deleted the post a few hours later. This confusion fed panic on social networks across the region.
Meanwhile, what was happening on the ground told its own story. Residents of Shelekhov saw people in the streets wearing protective suits, masks and gloves, and parents said masks had been handed out in kindergartens. On 4 October the director of the Irkutsk Aluminium Plant in Shelekhov, Artem Fominykh, ordered his workers to wear masks and told anyone feeling ill to see a doctor at once. According to the exiled news outlet Lyudi Baikala, several hospitals in Irkutsk closed for a three-week quarantine. A health sector source told the outlet that doctors were “openly talking about plague,” even though the word did not appear in official documents. The Kyiv Independent said it could not verify this reporting.
On Sunday, 4 October, Rospotrebnadzor, Russia’s consumer safety watchdog, gave its own version. The situation in the region was stable, it said, and the woman had died of “pneumonia of unknown aetiology.”
Strictly speaking, that was not wrong, since confirming plague requires laboratory tests of blood or other samples. But by then the region had seen a hospital sealed, children given masks, a neighbouring leader’s words rewritten and a travel warning deleted. In Irkutsk, people were left to compare the official name for Darya Shipilova’s death with the word that, according to one source, doctors were already saying aloud.