Russia Plague Case: Who Was Darya Shipilova and What Happened to Her?

Darya Shipilova, a 28-year-old laboratory technician at the Irkutsk Anti-Plague Institute in Shelekhov, Russia, died on Oct. 2 after being hospitalized with severe pneumonia. Shipilova’s case has attracted attention because she worked at a facility specializing in plague and other dangerous pathogens.

Independent Siberian outlet Lyudi Baikala reported that she accidentally broke a test tube containing live plague bacteria while working at the institute on Sept. 25. The account has been repeated by several media outlets, but Russian health authorities haven’t publicly confirmed that a laboratory accident occurred.

Reported Lab Incident Preceded Shipilova’s Illness

According to Lyudi Baikala, Shipilova broke a test tube containing biological material associated with plague during laboratory work on Sept. 25. The report said she later told medical personnel about the incident.

The account remains unverified by Russian federal health authorities. Rospotrebnadzor has specifically denied that an accident involving pathogenic microorganisms was recorded at the institute. The agency also said it found no microorganisms associated with Shipilova’s professional activities in additional testing.

There have also been conflicting reports about a possible field expedition. Some media reports said Shipilova had recently participated in an expedition near the Russia-Mongolia border, where plague activity had been detected among animals.

Authorities Dispute Reports Of Plague Infection

Russia’s federal consumer and public-health watchdog, Rospotrebnadzor, said Shipilova was diagnosed with “pneumonia of unknown etiology.” The agency said additional testing was conducted because of her professional activities but did not detect microorganisms associated with her work.

Rospotrebnadzor also said no emergency involving pathogenic microorganisms had been recorded at the Irkutsk Anti-Plague Institute. It described the sanitary and epidemiological situation in Irkutsk and Shelekhov as stable.

Irkutsk Governor Igor Kobzev said he had met with Russia’s chief sanitary official, Anna Popova, and that authorities were “implementing a full range of anti-epidemic measures.” Authorities placed people who may have had contact with Shipilova under medical observation.

Alexei Tsydenov, governor of neighboring Buryatia, initially said the woman had “died of plague.” Later reports said the wording of his statement was changed to say she may have died from plague.

Popova traveled to Irkutsk and took part in an emergency meeting of the regional sanitary and anti-epidemic commission after the case came to light.

Nearly 200 People Under Medical Observation

Nearly 200 people who may have come into contact with Shipilova have been placed under medical observation, according to reports. One report put the number at 197.

Irkutsk Governor Igor Kobzev said people under observation had shown no signs of illness and that tests had been negative.

Precautionary measures have also been introduced at medical facilities. Reports have differed over the number of hospitals affected and the extent of the restrictions. Meduza reported that several hospitals in Irkutsk were placed under quarantine, while a separate Oct. 5 report citing checks by IrCity said several hospitals were operating normally.

On Oct. 3, a mask requirement was introduced at the Irkutsk Aluminum Plant in Shelekhov as a preventive measure, according to Meduza.

Border Region Has Recorded Recent Plague Activity

The reports surrounding Shipilova’s death have also drawn attention to plague activity in the wider Russia-Mongolia border region.

Plague is caused by the bacterium Yersinia pestis and is maintained in animal populations, particularly among rodents and their fleas. Human infections can occur through infected flea bites, contact with infected tissues or materials, or, in the case of pneumonic plague, inhalation of infectious respiratory particles.

The connection between her reported laboratory work, a field expedition and her death remains unconfirmed.

Russia Hasn’t Confirmed Plague As Cause

As of Oct. 5, Russian federal health authorities haven’t confirmed plague as the cause of Shipilova’s death.

Rospotrebnadzor says the diagnosis was “pneumonia of unknown etiology” and that testing didn’t find microorganisms linked to her professional activities. At the same time, precautionary measures and contact monitoring remain in place.

The issue remains whether Shipilova was infected with Yersinia pestis, how she may have been exposed and whether anyone else has contracted the infection.

Pneumonic Plague Can Spread Through Respiratory Particles

Plague is a bacterial disease caused by Yersinia pestis. According to the World Health Organization, it usually circulates among small mammals and their fleas and can infect humans through flea bites, direct contact with infected material or inhalation of infectious respiratory particles.

There are several clinical forms of plague, including bubonic, septicemic and pneumonic plague. Pneumonic plague affects the lungs and is the form capable of spreading directly between people through respiratory particles.

WHO says untreated pneumonic plague can be rapidly fatal, while early diagnosis and antibiotic treatment can save lives.

Globally, WHO reported 3,847 suspected human plague cases and 423 deaths from 10 countries between 2019 and 2025. Six of those countries reported confirmed cases. Most reported cases came from the Democratic Republic of the Congo and Madagascar.

The focus in Irkutsk is determining the cause of Shipilova’s death and monitoring people who may have been exposed.

The reported laboratory accident, the possibility of exposure during fieldwork and the cause of Shipilova’s pneumonia remain matters requiring further verification.