The White House is following reports of a suspected case of pneumonic plague in the Irkutsk region of Russia, following the death of an employee of a research institute and the placement of nearly 200 people under medical observation.
An official in US President Donald Trump's administration told Axios that the administration "is aware, monitoring the outbreak and evaluating options."
Russian health authorities have taken precautions, but have not yet confirmed that the woman was infected with the plague.
Daria Shipilova, 28, worked as a laboratory technician at the Anti-Plague Research Institute in Irkutsk.
According to local Russian media reports, she may have been exposed on September 25 after breaking a test tube containing the pathogen that causes pneumonic plague. The circumstances of this incident have not been officially confirmed.
Shipilova was hospitalized on September 29 with severe pneumonia-like symptoms and died during the night between October 1 and 2.
After her death, authorities imposed quarantine measures in several health institutions and placed 189 people who may have had contact with her under medical supervision.
Irkutsk Governor Igor Kobzev described the case only as a suspicion of a "particularly dangerous infection," stating that the people under surveillance had not shown symptoms and had tested negative.
The Russian Health Ministry said the 28-year-old had suffered from "pneumonia of unknown etiology" and that further tests had not revealed microorganisms related to her work. According to the ministry, the epidemiological situation in the region remains stable.
However, the scale of the response has raised questions. According to reports, the head of Rospotrebnadzor and Russia's top sanitary official, Anna Popova, traveled from Moscow to Irkutsk to oversee the response to the situation.
Reports also say that some public events were canceled and antibiotics were in short supply in some pharmacies after increased demand.
At the same time, some warnings and reports about the plague have been removed from public space. Authorities in Baikalsk deleted a warning urging residents to avoid traveling to Shelekhov, while REN TV removed five posts mentioning the plague.
The head of neighboring Buryatia, Alexey Tsydenov, initially stated that Shipilova had died of the plague, but later changed the wording to say that she "may have died of the plague."
Despite emergency measures, the diagnosis remains unconfirmed. As of October 4, Russian authorities stated that the people placed under surveillance had no symptoms and had tested negative.