October 5, 2026

expert reaction to reports of Russian researcher ‘dying of accidental release of plague bacteria’

Scientists react to reports of Russian researcher ‘dying of accidental release of plague bacteria’ 

Dr Zania Stamataki, Associate Professor of Viral Immunology, Academic Lead for Containment Level 3 Laboratories, University of Birmingham, said:

“The death of a fellow laboratory scientist in Irkutsk is a terrible loss, and my thoughts are with her family and her colleagues.

“On the cause, it is so far described as a pneumonia of unknown origin, and Yersinia pestis has not been confirmed as the cause of pneumonic plague. 

“I understand why people find the idea of plague in a laboratory alarming, so it is worth saying why that work exists. Plague is not a historical disease. It remains endemic in rodent populations across Africa, Asia and the Americas, and human cases occur every year, including outbreaks of the pneumonic form. Diagnostics, vaccine development and surveillance for antibiotic resistance all require laboratories that hold and study the live organism. This work is vital to prepare against outbreaks.

“In the UK Yersinia pestis work is governed by two separate systems. The first is safety. Y. pestis is a Hazard Group 3 agent, so handling the viable organism is done at Containment Level 3: negative-pressure airflow, HEPA-filtered extract, a room that can be sealed and fumigated, and all open manipulation inside a microbiological safety cabinet. The Health and Safety Executive must be notified before such a facility is used and inspects it thereafter.

“The second is security. Y. pestis is a Schedule 5 agent under the Anti-terrorism, Crime and Security Act 2001. We must notify the authorities of what we hold, store it under lock, maintain a named list of everyone with access, and satisfy Counter Terrorism Security Advisers from the police. 

“Those controls work, which is why laboratory-acquired infections with this organism are rare. They are not impossible, and this is why an incident warrants a full account of what happened. That account matters beyond Russia. Around 200 contacts are reportedly under observation, and plague responds well to antibiotics if treatment starts early. Early notification allows effective treatment and outbreak containment.”

Prof Ian Jones, Professor of Virology, University of Reading, said:

“This case here seems like a rare lab accident and is unlikely to go much further. Although it is true that pneumonic plague is directly transmissible, the contacts of the primary case are known and can be treated if they show any sign of infection. Plague carries a huge history and is still present in many parts of the world including Russia, but the living conditions associated with previously spread are no longer generally true, antibiotics are available and its potential is therefore limited.”

Dr Simon Clarke, Associate Professor in Cellular Microbiology & Public Engagement in Science, University of Reading, said:

“Reports from Russia have inevitably drawn comparisons with Covid-19, but it is important to remember that pneumonic plague is a very different disease. It is caused by bacteria, Yersinia pestis, famous for causing the Black Death, that remains with us today mostly in animals across parts of Asia, Africa, and the Americas.

“Pneumonic plague is particularly serious because it means the infection has reached the lungs and is nearly always fatal if not treated promptly. Unlike the bubonic plague which enters the body via infected flea bites, pneumonic plague can spread between people through respiratory droplets during close contact. 

“Unlike many viral respiratory diseases, plague is caused by bacteria and antibiotics such as fluoroquinolones and aminoglycosides work well against this pathogen if administered early enough and are often given prophylactically, post-exposure.

“One claim attracting attention is that a laboratory worker may have been infected after breaking a test tube in the lab. It is not unheard of for pathogens to escape from labs, but an awful lot must have gone wrong for a lab worker to be infected by a broken test tube.

“Having worked in high-containment laboratories, I know that handling dangerous pathogens involves multiple layers of protection, strict procedures, safety cabinets, airflow systems and careful procedures carried out by well-trained staff. Lab-acquired infections are rare events, and a broken tube would not automatically lead to exposure or infection. We also don’t tend to use test tubes very much.

“Until more details emerge, it is difficult to assess whether this represents an isolated case, an occupational exposure, or evidence of wider transmission.  Exactly why this lab was working with this pathogen remains to be understood, but it is present in wild animals, and it could have come from a surveillance study.

“Any outbreak of plague is worrying, but this can be controlled and stopped with appropriate surveillance and control measures. Transparency, rapid diagnosis, and effective contact tracing will be the most important factors in managing this outbreak.”

Declared interests

Dr Zania Stamataki: “I have no conflict to declare as I don’t work on this pathogen.”

Prof Ian Jones: “I declare no conflicts of interest”

Dr Simon Clarke: “I have no declarations to make.”