Siberian Lab Worker's Death Sparks WHO Inquiry Into Suspected Plague Case in Russia

A laboratory technician identified by Russian and international outlets as Darya Shipilova, 28, died after being hospitalized with severe pneumonia at Shelekhov District Hospital near Irkutsk, in Siberia, according to reports cited by the World Health Organization (WHO) and the healthcare outlet Healthbeat. She worked at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East, a facility that studies dangerous pathogens, including the plague bacterium Yersinia pestis, in a region where plague occurs naturally, WHO spokesperson Christian Lindmeier said, according to UN News.

WHO said it began following the case on October 2, after media reports emerged, and contacted Russian health authorities the next day to request test results, the rationale behind contact tracing, and information on the health of people who had been near Shipilova, UN News reported. As of the WHO's statement, no official cause of death had been confirmed.

What is known

Regional media reported that Shipilova broke a test tube containing pneumonic plague pathogen on September 25, before falling ill, Healthbeat reported; Russian authorities have not confirmed this account. She was hospitalized on September 29 and died days later, according to Healthbeat's reporting. The head of the neighboring region of Buryatia, Alexei Tsydenov, said she had died "maybe of the plague," while adding she had not traveled to his region, Al Jazeera reported.

Nearly 200 people identified as contacts were placed under medical observation, with more than 100 held in hospital wards, according to reporting referenced by WHO. Russia's consumer health watchdog, Rospotrebnadzor, said it tested close to 5,000 samples and found no pathogens linked to dangerous infectious diseases among the contacts or in connection with Shipilova's laboratory work, according to Sky TG24 and Al Jazeera.

What remains disputed

Accounts diverge on the cause of death. Russian health authorities have described it as "pneumonia of unknown aetiology," while some regional officials and local media have pointed to pneumonic plague, Healthbeat reported. WHO Director-General Tedros Adhanom Ghebreyesus said the organization was also asking Russia about media reports of a second employee with pneumonia of undetermined cause, a claim Russian authorities have not confirmed, according to Healthbeat.

Sky TG24 reported that WHO official Maria Van Kerkhove said the agency needs a "complete picture of the event" before it can carry out a full risk assessment, and that verification requests to Moscow remained open as of October 7.

International response

WHO's initial risk assessment described the threat as "moderate to low" for the Irkutsk region, low for Russia overall, and "very low" for the WHO European region, according to UN News. Mongolia introduced health surveillance measures at its border with Russia as a precaution, Sky TG24 reported, while describing the current risk level as low.

The United States said its Centers for Disease Control and Prevention was monitoring the situation and called on Russia to "share accurate information quickly and openly," the State Department told Al Jazeera. U.S. President Donald Trump told reporters he did not believe the situation involved a biological weapon, Sky TG24 reported.

Background: what pneumonic plague is

Pneumonic plague is a form of plague caused by the bacterium Yersinia pestis that infects the lungs; WHO describes it as highly contagious and potentially fatal if not treated promptly with antibiotics. The bacterium naturally circulates among small mammals and their fleas in parts of Siberia, which is why the Irkutsk institute conducts routine surveillance and research on the pathogen, according to the WHO statement cited by Al Jazeera.