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Story summary
- Russia quarantined roughly 200 contacts after a 28-year-old lab worker died of unknown-origin pneumonia in Siberia.
- WHO Director-General Tedros Ghebreyesus said the agency lacks data for a full risk assessment.
- Tests on the worker and contacts were negative for high-threat pathogens, including plague.
- WHO said the main uncertainty is the undiagnosed cause, with no evidence of ongoing transmission.