The lack of details from the Russian authorities has unnerved U.S. officials and others around the world.

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Roughly 200 people are under medical observation, several hospitals are under quarantine, and dozens are in isolation in Russia following the unexplained death of an infectious disease researcher at the Irkutsk Anti-Plague Research Institute of Siberia, in the town of Shelekhov, according to early reports of the situation on Sunday and Monday.

Researcher Darya Shipilova reportedly died last week from pneumonia of "unknown" cause, according to Rospotrebnadzor, a Russian public health agency.

Unconfirmed information regarding her death has swirled. Some reports have claimed she accidentally broke a test tube containing the plague pathogen, Yersinia pestis, on September 25. She subsequently fell ill, was admitted to a hospital September 29 with severe pneumonia and died overnight between October 1 and October 2.  The head of the Russian region that neighbors Irkutsk, Alexey Tsydenov, initially reported that she had died of plague but later altered his statement to say she "possibly" died of the disease.

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The country’s consumer watchdog has said only that “an employee of an anti-plague institute in the Irkutsk Region” contracted pneumonia.

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