Pneumonic plague concerns grow after Russian lab worker dies, nearly 200 monitored
Russian authorities say plague has not been confirmed after the death of a worker at an anti-plague institute, with nearly 200 contacts under precautionary medical observation
06 October, 2026
TT
16
A worker at a Russian anti-plague research institute has died from an unexplained form of pneumonia, prompting authorities to place nearly 200 people under medical observation amid unconfirmed reports of a possible pneumonic plague infection.
The woman worked at the Irkutsk Anti-Plague Institute of Siberia and the Far East and died last week after developing what Russian authorities described as “pneumonia of undetermined origin”.
Igor Kobzev, governor of Russia’s Irkutsk region, said testing had not detected any microorganisms linked to the employee’s professional activities and that no new cases had been recorded among other workers at the institute.
“The sanitary-epidemiological situation” in the region remained stable, he said.
A hospital facility in Shelekhov, near Irkutsk, where the woman was reportedly treated has been placed under quarantine, while Russian media reported that nearly 200 people who had come into contact with her were being monitored as a precaution.
Russian authorities have not confirmed that the woman died from plague.
Rospotrebnadzor, Russia’s consumer and public health watchdog, said a biological safety team had inspected the institute and found no evidence of an emergency involving pathogenic microorganisms.
Kremlin spokesman Dmitry Peskov urged the public to rely on official statements rather than speculation surrounding the case.
“It is their official statements that should be relied upon — rather than paying heed to various rumours, speculations and the like,” Peskov said, referring to Rospotrebnadzor.
Unconfirmed Russian media reports have suggested the worker may have been exposed to the bacterium that causes plague either through a laboratory incident or following travel to an area where the disease occurs naturally among wild rodents. Neither explanation has been confirmed by authorities.
US monitoring suspected plague case
The incident has also drawn attention from the US and international health officials.
US President Donald Trump said Washington was looking “very strongly” at the case and offered US assistance if required.
“I hate to see them having it,” Trump said. “We’ll help. Everybody who has that kind of a problem, we’ll always help.”
US Secretary of State Marco Rubio said Washington was monitoring developments closely but stressed that there was no immediate cause for alarm.
“If something like that gets out, it can quickly spread,” Rubio said. “So we’re watching and monitoring it closely.”
The World Health Organisation said it was aware of reports that a laboratory worker had died from severe pneumonia but that no cause of death had been officially confirmed.
What is pneumonic plague?
Pneumonic plague is a severe form of plague caused by the bacterium Yersinia pestis, the same pathogen responsible for bubonic plague.
Unlike the more common bubonic form, pneumonic plague can spread between people through infectious respiratory particles following close contact with an infected person.
The WHO says pneumonic plague can be fatal within 18 to 24 hours after symptoms develop if left untreated, but antibiotics can successfully treat the disease when administered early.
Plague has not disappeared globally. Between 2019 and 2025, 10 countries reported 3,860 suspected human plague cases to the WHO. Six countries recorded confirmed cases, with 423 deaths reported among 3,847 suspected cases in those countries.
Most reported cases were concentrated in the Democratic Republic of the Congo and Madagascar.


















