Pneumonia, unknown origin in Russia
On 6 October 2026, following the reported death of a laboratory worker in Irkutsk, Russia, the Russian Federation health authorities informed the World Health Organisation (WHO) that no case of plague had been registered recently in Irkutsk Oblast. After testing negative for a number of high-threat pathogens, the patient was determined to have died from pneumonia of undetermined etiology. Based on the information provided, WHO has not identified evidence of ongoing transmission associated with this event. WHO will continue to monitor the situation and assess any potential public health implications as further information becomes available.
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