A suspected plague-related death at a research institute in Siberia has raised concerns about pneumonic plague, but experts say the incident does not currently indicate a global outbreak.
The 28-year-old laboratory worker, Darya Shipilova, died after developing severe pneumonia at the Irkutsk Anti-Plague Research Institute. Russian authorities have said the cause was pneumonia of unknown origin and have denied that a confirmed plague case occurred. Around 200 contacts were reportedly placed under quarantine. WHO has requested further information, including laboratory test results and the health status of contacts, and says it does not yet have enough information for a full risk assessment.
Plague is caused by Yersinia pestis and most commonly spreads through infected fleas. Bubonic plague is the most common form, while pneumonic plague affects the lungs and can spread between people through respiratory particles.
Pneumonic plague is highly serious and can progress rapidly if untreated. However, it can be treated effectively with antibiotics when diagnosed early. WHO recommends isolating patients, monitoring close contacts and providing preventive antibiotics to people who have been exposed.
Recent WHO surveillance also shows that human plague remains geographically concentrated. Between 2019 and 2025, six countries reported confirmed human plague cases, with most reported cases concentrated in the Democratic Republic of the Congo and Madagascar.
Therefore, while pneumonic plague requires rapid public-health action, the Siberian incident alone does not establish a global outbreak. Further testing and transparent information from Russian authorities will be important in determining the actual cause and assessing any wider risk.

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