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Nearly a week after a Russian lab worker's death sparked global alarm, the cause remains unknown — and the world is losing patience. The WHO says it still doesn't know what killed Darya Shipilova, a researcher at Siberia's anti-plague institute, while Russia insists there's no outbreak. The U.S. is now screening travelers from Siberia and has filed a formal diplomatic complaint demanding answers.
Nearly a week after reports surfaced of a possible pneumonic plague case in Russia, the mystery surrounding the death of Darya Shipilova — a worker at the Research Anti-Plague Institute of Siberia — remains unresolved. The WHO says it still doesn't know the "causative agent" behind her death and is pressing Russia for lab results, public health protocols, and the health status of her contacts. WHO is also working to verify reports that a second institute employee developed pneumonia.
Russia, meanwhile, is pushing back. Its public health agency, Rospotrebnadzor, says Shipilova died of "pneumonia of unknown etiology," that 5,000 tests found no dangerous pathogens, and that the epidemiological situation is stable. The Kremlin has called media coverage "false" and denied knowledge of any U.S. request for information.
On the U.S. side, the response has escalated. The CDC is monitoring travelers from Siberia — about 200 flights per year, mostly landing at JFK — and has set up port health screening. The State Department filed a formal diplomatic complaint (a démarche) warning Russia that withholding health data violates international health rules.
By the Numbers:
Why it matters: Pneumonic plague is the deadliest form of the disease, spreading person-to-person via respiratory droplets. Russia's lack of transparency has drawn comparisons to early COVID-19 information gaps, prompting urgent calls from the WHO, U.S., and Europe for full disclosure.
