WHO update: cause of Russian lab worker’s death remains unconfirmed

The World Health Organization’s first full outbreak notice on the death of a worker at Siberia’s Irkutsk Anti-Plague Research Institute says the cause remains unknown. The worker died on October 2 after being hospitalized with severe pneumonia. Initial reports raised suspected pneumonic plague and a possible workplace exposure, but the WHO says no diagnosis has been confirmed. Russian authorities told the WHO that more than 5,500 tests found no dangerous pathogens and that no plague cases had recently been registered in Irkutsk Oblast. All known contacts remained asymptomatic. Based on the information supplied by Russia, the WHO says it has found no evidence of ongoing transmission linked to the event. The agency says it still needs clinical, epidemiological and laboratory details to assess the case with greater confidence. The notice also addresses reports of a second case: the WHO describes it as unverified, and Russia denies that another case occurred. These reports do not establish a plague outbreak or confirm a laboratory exposure. The central unresolved question is still the cause of the worker’s illness and death. Sources: [WHO outbreak notice](https://www.who.int/emergencies/disease-outbreak-news/item/2026-DON620) · [Associated Press](https://apnews.com/article/russia-plague-siberia-death-who-cause-lab-d53d0eca3e410fa93962560d0a08711a) ~worldnews ~russia