Researcher at Russian Plague Laboratory Dies of ‘Unknown’ Infection

Dozens of people were reported to be in isolation after a Russian laboratory worker at an institute dedicated to studying the plague and other infectious diseases died of an undisclosed illness.

The researcher, a 28-year-old female laboratory technician at the Irkutsk Research Anti-Plague Institute of Siberia, in the town of Shelekhov, died after being diagnosed with a pneumonia of "unknown" origin, according to Rospotrebnadzor, the Russian agency that handles infectious disease.

U.S. Secretary of State Marco Rubio said Monday that the administration was watching the situation closely.

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