Nearly 200 placed under observation in Siberia after lab worker dies amid suspected plague reports, sparking concern online

Nearly 200 people have been placed under medical observation in Russia’s Siberian Irkutsk region after a laboratory worker died following severe pneumonia and a reported possible exposure to plague bacteria.

The case has prompted quarantine measures at medical facilities and an investigation into possible health and safety violations, while Russian health authorities have not confirmed that the woman contracted plague.

Lab worker dies after severe pneumonia

The woman was identified by Russian media as Daria Shipilova, a laboratory technician in her late 20s who worked at the Irkutsk Anti-Plague Research Institute.

Local reports said Shipilova had told medical staff that she accidentally broke a test tube containing live plague bacteria while collecting samples on 25 September 2026.

The reported laboratory exposure has not been independently confirmed by Russian health authorities.

She was hospitalised in Shelekhov, near Irkutsk, after developing severe pneumonia and was placed on a ventilator before her death on 2 October 2026, according to reports.

Russian media have described the suspected illness as pneumonic plague, a form of plague that affects the lungs and can spread between people through respiratory droplets.

However, Russia’s Federal Service for Surveillance on Consumer Rights Protection and Human Well-Being (Rospotrebnadzor) has not confirmed that diagnosis.

Authorities monitor nearly 200 contacts

Following Shipilova’s death, authorities identified 197 people who may have had contact with her and placed them under medical observation, according to reports.

The Shelekhov district hospital was placed under quarantine while authorities assessed the situation.

Other medical facilities have also reportedly introduced precautionary measures.

Irkutsk Governor Igor Kobzev said those identified as contacts had been placed under medical observation and that none had shown signs of illness.

He also said laboratory tests carried out so far had returned negative results.

Authorities also cancelled planned public events in Irkutsk as precautionary measures were introduced.

Russian authorities have not confirmed plague

The reports have differed from the official description of the woman’s illness.

Alexei Tsydenov, head of the neighbouring Republic of Buryatia, said the woman had died from an unspecified form of plague, citing information from Russia’s consumer safety watchdog Rospotrebnadzor and the Buryatian government.

However, subsequent reporting said Rospotrebnadzor described Shipilova’s illness as “pneumonia of unknown etiology” and said additional testing had not detected microorganisms connected with her work.

The agency said the epidemiological situation in the region remained stable.

Tsydenov also said Shipilova had not visited Buryatia and that her case was unrelated to the republic.

He said there were no plague outbreaks there, including in areas bordering Mongolia.

Investigation and international attention

Authorities reportedly opened a criminal investigation into potential violations of health and safety rules that may have resulted in a death.

The case has also attracted international attention.

Axios reported on 4 October 2026 that the White House was monitoring reports of a suspected plague outbreak in Russia and assessing the situation.

The uncertainty surrounding the diagnosis has also fuelled discussion online, with social media users expressing concern about the possibility of plague exposure while others responded with humour and jokes.

For now, Russian authorities have said there are no confirmed secondary cases among those under observation, while investigations and additional testing continue.