UK plague risk remains “very low” as Russian laboratory death is investigated

The risk to people in the UK remains very low following the unexplained death of a laboratory worker at a Russian institute that studies plague and other dangerous infectious diseases, health officials have said.

The 28-year-old woman worked at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East. She died last week after developing severe pneumonia, prompting precautionary quarantine measures and international scrutiny over whether she could have contracted pneumonic plague.

Russian public health authorities have described the cause of her illness as “pneumonia of unknown aetiology” and said tests did not identify any microorganisms associated with her professional work. Reports suggesting that she was exposed during a laboratory accident have not been officially confirmed, while investigations into her death remain underway.

Nearly 200 people who may have had contact with the woman have reportedly been placed under medical observation. Parts of the hospital where she was treated were quarantined, while staff at the research institute were also isolated as testing and contact tracing took place. No further linked cases have been reported, and Russian authorities have said the public health situation in the region is stable.

The World Health Organization said all known contacts had reportedly been identified and none had developed symptoms. It assessed the risk as moderate to low within Irkutsk, low across the rest of Russia and very low for Europe.

UK Health Security Agency guidance states that plague is not found in the UK and the probability of a case occurring in a returning traveller is very low. The infection does not spread as easily as illnesses such as Covid-19, and transmission of pneumonic plague generally requires close contact with an infected person who is coughing.

Pneumonic plague is the most serious form of disease caused by the bacterium Yersinia pestis. It affects the lungs and can spread between people through respiratory droplets. Without prompt treatment it can be fatal, but modern antibiotics are effective when the infection is recognised early.

The case has nevertheless prompted calls for Russia to release more information. US officials said they were monitoring developments and urged Russian authorities to communicate quickly and transparently, although they also stressed there was no current reason for public alarm.

For people in Britain, no additional precautions have been recommended. Health agencies will continue monitoring the investigation, but the absence of further cases, the distance involved and the nature of plague transmission all make the possibility of wider international spread extremely remote.

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