Fact Check: Viral Rumors of a Deadly Plague Lab Leak in Russia Debunked

Dozens of individuals have reportedly been placed under medical observation after a laboratory worker at a Russian institute specializing in plague and other infectious diseases died from severe pneumonia.

The tragic event quickly ignited intense speculation on social media, with posts ranging from public anxiety and comparisons to the COVID-19 pandemic to unverified claims about a laboratory incident.

DW Fact Check has analyzed several of the most prominent and widely circulating claims regarding this incident.

Alleged plague lab accident in Irkutsk remains unproven

Claim: “For those who don’t get it: in Irkutsk, a lab technician broke a flask containing the plague virus and became infected with the disease, dying a few days later,” a user posted on X in Russian. “This happened on September 25, and by October 2, she was already dead. In the meantime, she had infected several hundred people.” The post, which included a photo of the alleged laboratory worker, garnered over 320,000 views.

DW Fact check: Unproven

There is currently no independent evidence to support the claim that a leak of the plague pathogen occurred at the Irkutsk Antiplague Research Institute of Siberia and the Far East.

On the contrary, Russia’s public health authority, Rospotrebnadzor, stated that two commissions investigating biosafety procedures at the institute found “no evidence of an accident involving pathogenic microorganisms.” Additionally, the Russian news agency TASS, citing Rospotrebnadzor, reported that tests on the deceased employee detected no microorganisms linked to her professional activities.

Some social media users have pointed out the implausibility of the claim, highlighting that safety standards in high-containment laboratories often restrict or completely ban the use of glassware to minimize the risk of accidents.

The Irkutsk institute does handle highly pathogenic microorganisms, including strains classified under Russia’s highest pathogenicity categories, such as Yersinia pestis, the bacterium responsible for causing plague.

However, DW was unable to independently verify the formally designated biosafety level of the institute’s laboratories. Biosafety levels (BSL) represent an international classification system defining the containment measures necessary when handling dangerous pathogens, with BSL-4 reserved for the most hazardous agents.

DW reached out to the Irkutsk Antiplague Research Institute for comment on the alleged incident and its laboratory safety protocols but had not received a response by the time of publication.

WHO website update unrelated to the Russian case

Claim: “The WHO appears to have updated its fact sheet on plague the same day the Irkutsk lab worker presented at hospital, with (probably) the plague.” This claim appeared in a number of posts on X, each reaching thousands of users.

DW Fact check: Misleading

The World Health Organization (WHO) did update its plague fact sheet on the same day the Russian laboratory worker was hospitalized; however, no evidence links the two events.

According to media reports, the laboratory worker may have been exposed to Yersinia pestis around September 25. Four days later, on September 29, she was hospitalized in Shelekhov with severe respiratory symptoms.

The WHO updated its plague fact sheet on September 29, coinciding with the publication of a news release on global trends in cholera, meningitis, and plague. This update was part of a routine, broader publication cycle on infectious diseases by the organization.

The release reported global surveillance data covering 2019 to 2025, noting that the findings were published in the latest edition of the Weekly Epidemiological Record, which had been released on September 25.

Thus, the timing appears entirely coincidental. The previous version of the WHO’s plague fact sheet, accessible via an archived page, was dated July 7, 2022.

The social media account sharing the claim also changed its name in October to one suggesting it was reporting live from Irkutsk. Its profile describes itself as providing “sourced updates on the Irkutsk lab leak” and “latest news as it breaks live.” However, account metadata indicates it was created in May and is based in Australia.

Such accounts can emerge rapidly during breaking news events, often presenting themselves as local or specialist sources while sharing unverified and potentially misleading information.

Old video falsely linked to current plague claims in Russia

Claim: As news of the plague spreads, some old videos are being repurposed to amplify disinformation. In one such video posted on X, a user claimed that the plague has also spread to other parts of Russia. The caption in Russian reads, “The plague marches across Russia. God has heard our prayers!”

DW Fact check: Misleading

The video is old and unrelated to the current developments in Irkutsk. A reverse image search reveals that the video was initially posted on August 31 of this year, claiming that it showed the Russian republic of Kabardino-Balkaria, a tourist destination located approximately 6,000 kilometers (3,700 miles) from Irkutsk.

The old video has been viewed more than 1.7 million times on Instagram and was also shared on Telegram. The Russian news agency TASS reported on August 31 that the plague pathogen had been detected in local squirrels, prompting authorities to close the area to tourists.

In the video, a person can be heard saying in Russian, “It’s at the turnoff from the paved road toward Serebryany Istochnik.” Serebryany Istochnik, or Silver Spring, is a natural spring located in the Dzhily-Su area of Kabardino-Balkaria.

The situation in the Irkutsk region remains under investigation, but there are currently no confirmed reports of a plague outbreak in Russia. Health authorities have introduced precautionary measures following the death of the laboratory worker while further tests are reportedly being conducted.

Edited by: Joscha Weber

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