Moscow: Russian health authorities have said there is no risk of an epidemic after a 28-year-old laboratory worker at a plague research institute in Siberia died from pneumonia of unknown origin. The World Health Organization, however, has asked Moscow for more information about the illness and the public health measures taken after her death.

What happened in Siberia?

The laboratory worker, identified as Darya Shipilova, died on October 2 after being hospitalised with cold-like symptoms. She worked at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East, a facility that studies dangerous infectious diseases including plague.

Russian authorities have not established the exact cause of her pneumonia. Rospotrebnadzor, Russia’s health watchdog, said extensive testing had found no evidence that her illness was caused by any of the pathogens she worked with.

Authorities initially placed around 200 people under quarantine or medical observation following her death. Rospotrebnadzor said about 90% had since been released and that nearly 5,000 laboratory tests had failed to detect dangerous pathogens.

The agency also said no cases of plague had been identified among people who had contact with Shipilova and that she had been vaccinated against the dangerous infections handled at the facility.

Why has pneumonic plague been mentioned?

Concern surrounding the case has been linked to reports that the worker may have died from pneumonic plague, one of the most severe forms of plague and one that can spread between people through respiratory particles.

However, Russian authorities have not confirmed pneumonic plague as the cause of death.

Pneumonia can have many causes, including bacterial infections, influenza, COVID-19 and, in some circumstances, plague. The exact cause in Shipilova’s case remains undetermined.

Reports of a second person in Siberia allegedly dying from plague have also circulated online. Reuters said it could not find evidence in Russian media that such a death had occurred, while some social media bloggers had made the claim without evidence.

WHO seeks more information

WHO Director-General Tedros Adhanom Ghebreyesus said the organisation had asked Russia for additional information to clarify the cause of the severe pneumonia and the pathogen that prompted the public health measures.

The WHO also sought clarification over reports of a second employee with pneumonia of undetermined cause.

Tedros said timely and transparent information-sharing under international health regulations was necessary to assess the potential public health risk accurately.

The WHO currently considers the risk to the general public to be low based on the information available.

Russia says there is no epidemic risk

Rospotrebnadzor said on Wednesday that precautionary measures were being wound down after authorities concluded there was no risk of an epidemic.

The agency said testing of people who had been in contact with Shipilova had detected two COVID-19 cases and two rhinovirus cases, but no other dangerous infectious pathogens.

The Kremlin said Russia had properly informed the WHO about the incident. Kremlin spokesman Dmitry Peskov also criticised what he described as false information circulating in media reports and urged people to rely on statements from Russia’s health regulator.

Why the case is attracting global attention

The incident has drawn international attention because the worker was employed at a specialist plague research facility and died from pneumonia whose cause has not yet been established.

The sensitivity is also heightened by the experience of the COVID-19 pandemic, which increased international concern around unexplained clusters of respiratory illness.

At present, however, there is no confirmed evidence in the information available that a plague outbreak is occurring in Siberia.

The key issue is the gap between what has been confirmed and what has been reported or speculated.

Russia has confirmed the death from severe pneumonia and the precautionary monitoring of contacts, but has not identified the pathogen responsible. Its health regulator says extensive testing has found no dangerous pathogen among contacts and that there is no epidemic risk.

The WHO has not said that a plague outbreak is taking place. Instead, it is seeking additional information to resolve unanswered questions about the cause of the pneumonia and the reason for the public health measures.

For now, the available information therefore points to an unexplained individual death under investigation rather than a confirmed plague outbreak. The situation could change if further laboratory testing identifies a pathogen or if additional linked cases are confirmed.

Russian authorities are expected to continue reviewing laboratory and epidemiological data, while the WHO is seeking further information from Moscow.

The main developments to watch are confirmation of the cause of Shipilova’s death, whether any additional linked cases are identified, and whether Russian authorities provide further details about the tests conducted.

Until then, claims that a pneumonic plague outbreak has begun in Siberia remain unconfirmed.