For almost a whole day, the people running Russia’s Irkutsk region had a phrase ready to use. It was not the word that everyone was waiting to hear. On 2 October 2026, Igor Kobzev, the regional governor, talked about “a particularly dangerous infection.” He also promised the public that “the situation is under strict control.” During the first 24 hours, neither he nor the regional authorities said the word “plague.”
The woman at the centre of the story was Darya Shipilova. She was 28 years old and worked as a laboratory assistant at the Irkutsk Research Anti-Plague Institute, where she handled dangerous pathogens. She died in intensive care at the district hospital in Shelekhov, a town close to the regional capital. According to local media, she had broken a test tube that contained the plague pathogen.
The first reports offered a little more detail, and they gave a slightly different date. Two outlets reported the case: Lyudi Baikala (People of Baikal), a news outlet that works in exile, and REN TV, a broadcaster that supports the Kremlin. Neither gave her full name. They called her only Daria Sh. and said she was 27 or 28. In their account, she told medical staff that she had broken a test tube of live bacteria by accident while she was collecting samples for testing. She was admitted to the hospital in Shelekhov on Tuesday, 29 September, with symptoms of severe pneumonia. Doctors put her on a ventilator, and she died on Thursday, 1 October. Euronews, however, said that she died in the early hours of 2 October. The Kyiv Independent reported that the accident had taken place about a week before her death. It also said the tube contained the pathogen responsible for pneumonic plague.
That detail is important, because pneumonic plague is the most frightening form of a very old disease. Plague is caused by a bacterium called Yersinia pestis, and it has three forms. Two of them, the bubonic and the septicemic forms, are usually spread by flea bites or by contact with infected animals. The pneumonic form attacks the lungs. It generally passes from one person to another through the air, in the droplets people produce when they cough. The time between infection and the first symptoms is usually two to four days, but it can be as short as a few hours. At first, it is impossible to tell it apart from several other respiratory illnesses. If it is not diagnosed and treated quickly, the patient can die within one to six days, and without treatment it almost always kills. People who have been exposed to a patient can be given medicine to prevent the disease.
This made it urgent to find out who had been near the young laboratory assistant. By 2 October, health authorities had put nearly 200 people under medical observation. At least 197 people who might have been in contact with her were being monitored. The district hospital in Shelekhov was placed under quarantine until a special commission could inspect it.
The officials in Irkutsk chose their words carefully, but a politician in the neighbouring region did not. Alexei Tsydenov, the head of the neighbouring republic of Buryatia, said that the woman had died of plague, although he did not say which form. He referred to information from Rospotrebnadzor, Russia’s consumer safety watchdog, and from Buryatia’s own government. He said that she had not been to his republic and that her infection had no connection with it. On social media he wrote: “There are no plague outbreaks in the republic, including in areas bordering Mongolia.” His statement did not stay as it was, however. It was later changed, and the new wording was more cautious.
Other officials also said things and then took them back. On 3 October, the authorities in Baikalsk advised residents not to travel to Shelekhov because of plague. A few hours later, they deleted the post. According to Euronews, this confusion encouraged panic on social networks in Irkutsk and the regions around it.
At the same time, the measures being taken on the ground showed how serious things were. Governor Kobzev chaired an emergency meeting of the sanitary and anti-epidemic commission. On 4 October, Artem Fominykh, the director of the Irkutsk Aluminium Plant in Shelekhov, told the factory’s employees to wear masks because of the situation in the region. He also asked anyone who felt unwell to see a doctor at once. Lyudi Baikala reported that several hospitals in the city of Irkutsk had closed for three weeks of quarantine. They included city hospitals No. 1, 3 and 10, as well as the Ivanovo-Matreninsk Children’s Clinical Hospital.
People living in Shelekhov said they had seen others in the streets wearing protective suits, masks and gloves. Parents said that kindergartens had given out masks.
There was a gap between what doctors said in private and what was written in official papers, and it was reported openly. A source in the health sector told Lyudi Baikala that doctors in Irkutsk were “openly talking about plague.” Even so, the disease was not mentioned in any official documents. The Kyiv Independent said it was unable to check the outlet’s reporting.
Some people tried to reassure the public. Gennady Onishchenko, a well-known Russian epidemiologist, explained that in Siberia plague is carried by rodents and their fleas. He noted that these animals usually go into their winter sleep by early October. According to Euronews, this did not make people any less afraid. But his argument was about plague in the wild. Every report agreed that the case which had frightened the region did not start with a flea but inside a laboratory.
Accidents like this have happened before. Infections caught in laboratories have been recorded ever since a case of typhoid fever was reported in 1885. Even after decades of improvements in biosafety, they still put laboratory workers in danger.
On Sunday, 4 October, Rospotrebnadzor gave its own account. The agency said that the sanitary and epidemiological situation in the Irkutsk region was stable. It said the woman had died of “pneumonia of unknown aetiology,” which means pneumonia with no known cause.
Strictly speaking, this diagnosis did not contradict the medical facts. The early signs of pneumonic plague look like those of other respiratory illnesses, and plague can only be confirmed by testing blood, sputum or other samples in a laboratory. Still, by that point the region had already seen a hospital closed off, children given masks, a neighbouring leader’s statement rewritten and a travel warning deleted. In Irkutsk, people were left to compare two things: the official name for Darya Shipilova’s death, and the word that, according to one source, doctors were already saying out loud.