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Russia lifts Irkutsk quarantine; WHO still doesn't know what killed lab worker

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Updated Thursday, 8 October 2026, 5:47 p.m. MT

Russian authorities have declared the all-clear in the Irkutsk region after the death of a laboratory worker at a Siberian anti-plague institute. "The quarantine has been lifted. We are working as usual," Irkutsk Governor Igor Kobzev said in a video address on Thursday, according to IrCity.

The World Health Organization (WHO) says it still does not know what killed 28-year-old Darya Shipilova. "We don't know exactly how this person died," Maria Van Kerkhove, the WHO's director of epidemic and pandemic management, said on Wednesday, according to El País. "They haven't found the causative agent, that we know, and so this is why we need more information."

What is new since Tuesday's update

The governor's all-clear. Kobzev said the woman had "community-acquired" pneumonia, the term Russia used in its note to the WHO. He said medical observation of all contacts had ended. "The results of almost 5,000 laboratory tests did not reveal any dangerous pathogenic microorganisms," he said (IrCity). He said she had been vaccinated and was immune to the dangerous infections she worked with, and that no accidents with pathogens had occurred at the institute (Lenta.ru).

"Amid information pressure, specialists carefully investigated the situation. It was a test, but we came through it with dignity," Kobzev said, as quoted by The Moscow Times. AP noted that he did not say what caused the pneumonia and "did not explicitly say that her death was not caused by pneumonic plague."

The governor and the WHO. Kobzev said the WHO had "publicly confirmed the absence of risks to public health," URA.ru reported. That is not what the WHO said. At its Wednesday briefing, Director-General Tedros Adhanom Ghebreyesus said: "As we don't yet have the full picture of this event, we are not able to conduct a full risk assessment" (El País). Rospotrebnadzor, Russia's federal public-health agency, made a narrower claim: that the WHO had publicly confirmed receiving its information at the 7 October briefing (The Moscow Times).

A second case called fake. Rospotrebnadzor said social-media reports of a second person falling ill after contact with Shipilova were "fake information" that "does not correspond to reality," Caliber.az and The Moscow Times reported. AP said the agency offered no new information about her illness or the reasons for the emergency measures. The Moscow Times dates the statement to Wednesday; AP reported it on Thursday.

Contacts: 90 or 100 per cent? On Tuesday, the note Russia sent through the WHO said observation of "100% of the contacts has now been concluded" (AP). On Wednesday, Rospotrebnadzor said observation had ended for "more than 90%" of contacts as of 7 October, The Moscow Times reported. Reuters reported the same figure. Only on Thursday did Russian officials say monitoring of all contacts had ended (IrCity). Russia has not explained why its note to the WHO reported a higher figure than its own agency did the next day.

The WHO's questions. Tedros said the WHO has asked for "further information on the laboratory tests conducted on the individual who died and the contacts, more detail on what prompted the public health measures, and details about the health status of the contacts." He said the WHO also sought verification of reports of a second employee with pneumonia, and has offered help with plague and laboratory biosafety (El País). Russia has not asked for WHO experts.

"If this individual didn't die from plague, then how did she die?" Van Kerkhove asked, according to Reuters. Tedros said Russia had not formally responded on the second-case reports and that he had heard "only informally" that it denied them (Reuters).

The Kremlin. Spokesman Dmitry Peskov said on Wednesday that "the vast majority of what the media are reporting about this situation is false information" and told reporters to rely on the health regulator (Reuters). On Thursday he said no time had been set for a call between Vladimir Putin and U.S. President Donald Trump. "When the exact time of the conversation is agreed, and it takes place, we will inform you. We will hide nothing," Peskov said (Xinhua).

Washington. Asked on Wednesday whether a bioweapon was involved, Trump said: "We don't think so. We're going to find out soon enough, but we don't think so." He said Russia "is not saying much either, but they do say they have it very much under control" (Reuters). Centers for Disease Control and Prevention Director Erica Schwartz said the risk to the United States was "extremely low" and that the agency was prepared to monitor and screen travellers (Reuters).

The mother's account

Shipilova's mother, Svetlana, who is also a medical professional, rejected reports that her daughter broke a tube of plague bacteria. "Not even all medical professionals understand it's impossible to break a test tube like that. Even if you fling it at the wall," she told the Russian outlet Glubina, as reported by The Economic Times. "They simply let my daughter die," she said. She did not explain what she meant.

What the experts say

Two specialists interviewed by Sibir.Realii, a Siberian service of Radio Free Europe/Radio Liberty (RFE/RL), said the broken-tube story is unlikely but that plague cannot be ruled out on the information published so far.

Epidemiologist Andrei Aleksandrin, founder of Ukraine's National Expert Group on Infection Control, said modern labs use tightly sealed plastic tubes. "This particular version seems untrue to me. But that does not exclude the possibility that a completely different accident could have happened," he said.

Aleksandrin said Shipilova's timeline is "theoretically very similar" to plague's incubation period. According to colleagues, she was last at the lab on 25 September, was hospitalized on 29 September and died overnight on 1–2 October. However, he said that if plague had spread, a large outbreak would already be visible: "There can be no talk of any epidemic, let alone a pandemic."

Microbiologist Alisa Litovka said one negative test is not enough. Results can be falsely negative, especially if the patient took antibiotics. Plague vaccines give "weak and unreliable" protection against the pneumonic form, she said. She called the "unknown severe pneumonia" wording "a brush-off" and said reliable data would be PCR, culture and microscopy results.

Rospotrebnadzor has not said which tests were done, on which samples or when they were taken, RFE/RL noted.

About Shipilova. RFE/RL reported that she graduated in medical biochemistry from Irkutsk State Medical University in 2022 and joined the institute that year. In March 2026, she was listed as a co-author of a paper on the antibiotic susceptibility of Yersinia pestis, the bacterium that causes plague, from Siberian plague foci. In August she took part in international rapid-response exercises. A colleague said she "was very afraid of infecting someone."

Neighbours

Thailand's Department of Disease Control said it was monitoring the case with the WHO, and officials told EFE they had no information that Shipilova had travelled there. Mongolia ordered health surveillance at its border with Russia; crossings in Selenge province are operating normally. China said it is in "close communication" with Russia (El País).

Rumours, labelled

Reports of a second case or a second death remain unconfirmed and are denied by Russian officials. Reuters found no such stories in Russian media. After its briefing, the WHO pointed Reuters to a report on starhit.ru, a celebrity gossip site, and a Daily Mail follow-up.

Social-media claims that Shipilova was infected on trips to Thailand, Moldova or near the Mongolian border are unsupported: "There is no evidence in the public domain to support any of those theories," Reuters reported.

What is still unknown

  • Which pathogen caused Shipilova's pneumonia, and which tests ruled out Yersinia pestis in her samples
  • Why about 200 people were isolated if her illness was a community-acquired pneumonia
  • Why Russia told the WHO all contacts were released a day before its own agency said 90 per cent
  • Whether Russia has formally answered the WHO's questions

No WHO Disease Outbreak News notice has been published. An international plague conference is still scheduled in Irkutsk on 21–22 October (AFP).

Sources