Siberia lab worker's death prompts pneumonic plague investigation

Russian authorities are working to calm public concern after a 28-year-old lab technician died from pneumonia of unknown origin, sparking an investigation into possible pneumonic plague. Darya Shipilova worked at a plague research institute in Siberia. Shipilova died on October 2 in a hospital in Shelekhov, which was placed under quarantine as a preventive measure. Unconfirmed media reports suggested she may have contracted pneumonic plague after a lab accident, but Russian health officials rejected this, saying tests found no pathogens linked to her work. No secondary plague cases have been confirmed, and contacts tested negative for Yersinia pestis. The U.S. is monitoring the situation, while the Kremlin urged the public to rely on official information. The exact cause of Shipilova's illness remains undetermined.