What is the ‘Russian plague’? Inside the Siberian health scare, nearly 200 monitored after lab researcher dies

Russian health authorities are investigating a suspected dangerous infection after a researcher at a plague laboratory in Siberia died from severe pneumonia, prompting nearly 200 people to be placed under medical observation.

The woman, reported to be 28, worked at the Irkutsk Anti-Plague Research Institute in Shelekhov, near Irkutsk. Independent reports claimed she may have accidentally broken a laboratory test tube containing plague bacteria, although Russian authorities have not confirmed that account.

Russia’s public health agency, Rospotrebnadzor, said the researcher had “pneumonia of unknown etiology” and that testing did not find pathogens associated with her laboratory work. It said the sanitary and epidemiological situation in Irkutsk and Shelekhov remained “stable.”

Irkutsk Governor Igor Kobzev convened an emergency meeting over what he called a “suspected case of a particularly dangerous infection.” Authorities introduced anti-epidemic measures, while reports said about 200 potential contacts were placed under observation. No confirmed secondary plague infections have been reported.

The United States is also monitoring developments. A US State Department spokesperson said: “We are monitoring the situation closely with the CDC and our other interagency partners,” while stressing that many details remained unconfirmed.

What is pneumonic plague?

Pneumonic plague is the lung form of plague caused by Yersinia pestis. Unlike the more common bubonic form, pneumonic plague can spread between people through respiratory droplets during close contact. Symptoms can include fever, weakness, chest pain, coughing and rapidly developing pneumonia. It can be fatal without prompt treatment, but antibiotics are effective when administered early.

For now, describing the incident as a confirmed “Russian plague outbreak” would be premature. The central unresolved question is whether the researcher actually contracted plague; Russian health authorities say that has not been established.