A laboratory technician at the Irkutsk Anti-Plague Institute in Siberia was admitted with severe pneumonia on 29 September and died on 2 October, according to ECDC1. WHO learned of the death from media reports that day and sent verification requests under the International Health Regulations (IHR) on 3, 5, 6 and 7 October, including one about a reported second case, its bulletin of 10 October says2.
Russia's IHR focal point, the office each state names to answer WHO, replied on 6 October that no Plague was registered in Irkutsk Oblast, that the death was pneumonia of undetermined cause, and that two independent investigations found no biosafety incident. It called the media reports inaccurate. Rospotrebnadzor, the federal health watchdog that runs the institute, ran more than 5,500 laboratory tests; contacts tested negative for high-threat pathogens, and their monitoring ended on 9 October3. Governor Igor Kobzev lifted hospital quarantines on 8 October, Russian media reported4.
WHO says no cause has been identified and it cannot judge whether contacts were watched for long enough. "A laboratory-associated exposure therefore cannot be fully excluded at this stage," its bulletin says, with confidence rated "limited"5. Russian outlets reported suspected pneumonic Plague, the lung form of the disease, which spreads between people by coughing; Rospotrebnadzor denies it. The worker had been vaccinated against the pathogens handled at work and had not left the oblast in the two weeks before falling ill.
IHR articles 9 and 10 let WHO ask a state to verify a report. They do not let WHO test a sample itself. The same treaty let Tedros declare the Ebola emergency in May without first convening his expert committee, but it gives him no right to enter a Russian laboratory, so Geneva's account rests on Moscow's.
