Plague is one of history’s most feared diseases, responsible for pandemics that killed tens of millions of people. Today, human cases are rare and can usually be treated with antibiotics.
A suspected case of pneumonic plague in Siberia has renewed attention on the disease after a young worker at a Russian institute that studies plague and other dangerous infections died of severe pneumonia.
Russian authorities told the World Health Organization that no case of plague has been recorded in the region. Still, the circumstances of the woman’s death and the precautions taken afterward have prompted international scrutiny, with the WHO seeking more information from Russia.
What happened in Siberia?
A 28-year-old laboratory worker at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East died overnight between Oct. 1 and Oct. 2 after developing severe pneumonia.
Some local Russian media reported that she may have been exposed to the bacterium that causes plague after breaking a test tube at the institute. That account hasn’t been verified. The institute itself told the government-owned Rossiyskaya Gazeta newspaper that no such incident had occurred.
The media reports have raised questions about how any possible exposure to plague could have happened. Work with dangerous pathogens normally involves multiple layers of protection designed to prevent a spill or broken container from exposing laboratory staff.
What have Russian authorities said?
Russia’s public health agency, Rospotrebnadzor, said an investigation found no laboratory accident involving dangerous microorganisms. It also said that extensive testing of samples from the woman found no microorganisms associated with her work. The official cause of her illness remains pneumonia of “unknown” origin. No plague infections have been confirmed among her contacts, and Russian authorities say the epidemiological situation is stable.
Those official comments came after Rospotrebnadzor head Anna Popova traveled to Irkutsk and took part in an emergency meeting of the regional sanitary and anti-epidemic commission on Oct. 2.
Are there any restrictions in place?
Local media cited unverified reports that almost 200 people who may have had contact with the woman were placed under medical observation and that the hospital where the deceased laboratory worker was treated had been quarantined. There were also reports that restrictions had been imposed at medical facilities across the region.
Local authorities and Rospotrebnadzor denied that such measures have been taken. Still, some precautionary steps were introduced by others in the area. The Irkutsk Aluminium Smelter — a unit of United Co. Rusal International PJSC and one of the region’s largest employers — introduced a mask requirement, said that workers should seek medical attention if any symptoms developed, and advised them to rely on official information, according to a Telegram post by the smelter’s chief executive officer, Artyom Fominykh.
Plague is one of history’s most feared diseases, responsible for pandemics that killed tens of millions of people. Today, human cases are rare and can usually be treated with antibiotics.
A suspected case of pneumonic plague in Siberia has renewed attention on the disease after a young worker at a Russian institute that studies plague and other dangerous infections died of severe pneumonia.
Russian authorities told the World Health Organization that no case of plague has been recorded in the region. Still, the circumstances of the woman’s death and the precautions taken afterward have prompted international scrutiny, with the WHO seeking more information from Russia.
What happened in Siberia?
A 28-year-old laboratory worker at the Irkutsk Anti-Plague Research Institute of Siberia and the Far East died overnight between Oct. 1 and Oct. 2 after developing severe pneumonia.
Some local Russian media reported that she may have been exposed to the bacterium that causes plague after breaking a test tube at the institute. That account hasn’t been verified. The institute itself told the government-owned Rossiyskaya Gazeta newspaper that no such incident had occurred.
The media reports have raised questions about how any possible exposure to plague could have happened. Work with dangerous pathogens normally involves multiple layers of protection designed to prevent a spill or broken container from exposing laboratory staff.
What have Russian authorities said?
Russia’s public health agency, Rospotrebnadzor, said an investigation found no laboratory accident involving dangerous microorganisms. It also said that extensive testing of samples from the woman found no microorganisms associated with her work. The official cause of her illness remains pneumonia of “unknown” origin. No plague infections have been confirmed among her contacts, and Russian authorities say the epidemiological situation is stable.
Those official comments came after Rospotrebnadzor head Anna Popova traveled to Irkutsk and took part in an emergency meeting of the regional sanitary and anti-epidemic commission on Oct. 2.
Are there any restrictions in place?
Local media cited unverified reports that almost 200 people who may have had contact with the woman were placed under medical observation and that the hospital where the deceased laboratory worker was treated had been quarantined. There were also reports that restrictions had been imposed at medical facilities across the region.
Local authorities and Rospotrebnadzor denied that such measures have been taken. Still, some precautionary steps were introduced by others in the area. The Irkutsk Aluminium Smelter — a unit of United Co. Rusal International PJSC and one of the region’s largest employers — introduced a mask requirement, said that workers should seek medical attention if any symptoms developed, and advised them to rely on official information, according to a Telegram post by the smelter’s chief executive officer, Artyom Fominykh.
What’s been the international response?
The European Commission is monitoring “very closely what is going on,” spokesperson Eva Hrncirova said. US Secretary of State Marco Rubio told reporters that “it would be reckless at this moment, given the limited information we still have, to speculate about what this might or might not be” and encouraged Russia to share more details.
The WHO says Russian authorities told it that no plague case had been registered in the region and that identified contacts were tested and placed under medical observation, which has now been completed. Russia reported that no high-threat pathogens were detected among them. WHO Director-General Tedros Adhanom Ghebreyesus said the agency has asked Moscow for further information to clarify what caused the woman’s severe pneumonia, what pathogen prompted the public-health measures, and reports that a second institute employee has developed pneumonia. He said timely and transparent information sharing was needed to assess the potential public-health risk.
What exactly is plague?
Plague is a bacterial infection caused by Yersinia pestis, which normally circulates among rodents and other small mammals and the fleas that live on them.
People usually become infected after being bitten by an infected flea or through contact with an infected animal. The bacteria can also be inhaled, and people with pneumonic plague can spread the infection to others through respiratory particles.
There are three main forms of plague, all caused by the same bacterium but primarily affecting different parts of the body.
Bubonic plague, the most common, typically causes fever, chills and painful, swollen lymph nodes known as buboes. It is the form most closely associated with the Black Death of the Middle Ages.
Septicemic plague occurs when the bacteria multiply in the bloodstream. It can cause bleeding, tissue damage, organ failure and shock.
Pneumonic plague occurs when the bacteria infect the lungs. It can develop when another form of plague spreads to the lungs or when a person inhales the bacteria directly. Symptoms can develop rapidly and include fever, weakness, chest pain, shortness of breath and coughing, sometimes with bloody sputum.
Does plague still exist today?
Yes. The bacteria persist in wild animal populations in parts of Africa, Asia and the Americas, meaning plague can’t realistically be eradicated.
The WHO recorded 3,847 suspected human cases and 423 deaths in 10 countries from 2019 through 2025. Most occurred in the Democratic Republic of the Congo and Madagascar.
Cases also occur occasionally in wealthier countries. The US typically records several infections a year, mostly in western states where the bacteria circulate naturally among wild rodents and their fleas.
How dangerous is pneumonic plague?
Antibiotics, modern sanitation and disease surveillance mean plague no longer poses anything like the threat it did centuries ago. Still, it’s very dangerous if it isn’t recognized and treated quickly.
Pneumonic plague is the most rapidly progressing form of the disease. Symptoms can appear within one to three days of exposure. Without effective antibiotics, the infection can kill within about a day of severe symptoms developing.
That makes early treatment critical. The WHO says common antibiotics are effective against Yersinia pestis and the chances of recovery are high when pneumonic plague is detected and treated promptly. People known to have been exposed can also be given antibiotics before they become sick.
The short incubation period also means infections typically become apparent relatively quickly. Several days after the Russian worker died, there was still no confirmation that she had plague. Russian authorities told the WHO that medical observation of all identified contacts had been completed and that no high-threat pathogens were detected among them.
How easily does pneumonic plague spread?
Pneumonic plague is the only major form of plague that can spread directly between people.
An infected person can release bacteria in respiratory particles when coughing. Transmission generally requires close exposure to somebody who is sick, particularly when the patient is coughing. Unlike Covid-19 or influenza, plague isn’t known for sustained transmission through communities by people with mild or no symptoms.
People with pneumonic plague usually become severely ill within a short period, which can help health authorities identify cases and trace their contacts. Still, because the disease progresses rapidly and can spread between people, even a single suspected case requires an urgent public-health response.
When pneumonic plague is suspected, health authorities generally act before waiting for laboratory confirmation. The WHO recommends starting appropriate antibiotics, as well as identifying and monitoring close contacts and generally giving them preventive antibiotics for seven days.
Why does Russia have an “anti-plague” institute?
Anti-plague institutes have a long history in Russia and other parts of the former Soviet Union.
Plague occurs naturally in wild rodents across parts of Central and northern Asia, including Siberia, Mongolia and northern China. Russia has long operated a network of specialist laboratories and monitoring stations to detect plague in animals, investigate human infections and prevent outbreaks.
The Irkutsk institute was established in 1934 specifically to combat plague in Siberia and the Russian Far East. Its responsibilities later expanded to other dangerous infections including cholera, anthrax and brucellosis, as well as other diseases that can spread from animals to people.
Today, the institute says it monitors areas where plague circulates naturally across Siberia and the Far East, conducts disease surveillance and diagnostic testing, advises regional health authorities and helps respond to outbreaks of dangerous infections.
Until the Soviet Union collapsed in 1991, it also operated a secret biological weapons program that included research on Yersinia pestis. That history has contributed to international scrutiny of the Siberian incident, although there is no public evidence linking the Irkutsk worker’s death to any biological weapons research.
The European Commission is monitoring “very closely what is going on,” spokesperson Eva Hrncirova said. US Secretary of State Marco Rubio told reporters that “it would be reckless at this moment, given the limited information we still have, to speculate about what this might or might not be” and encouraged Russia to share more details.
The WHO says Russian authorities told it that no plague case had been registered in the region and that identified contacts were tested and placed under medical observation, which has now been completed. Russia reported that no high-threat pathogens were detected among them. WHO Director-General Tedros Adhanom Ghebreyesus said the agency has asked Moscow for further information to clarify what caused the woman’s severe pneumonia, what pathogen prompted the public-health measures, and reports that a second institute employee has developed pneumonia. He said timely and transparent information sharing was needed to assess the potential public-health risk.
What exactly is plague?
Plague is a bacterial infection caused by Yersinia pestis, which normally circulates among rodents and other small mammals and the fleas that live on them.
People usually become infected after being bitten by an infected flea or through contact with an infected animal. The bacteria can also be inhaled, and people with pneumonic plague can spread the infection to others through respiratory particles.
There are three main forms of plague, all caused by the same bacterium but primarily affecting different parts of the body.
Bubonic plague, the most common, typically causes fever, chills and painful, swollen lymph nodes known as buboes. It is the form most closely associated with the Black Death of the Middle Ages.
Septicemic plague occurs when the bacteria multiply in the bloodstream. It can cause bleeding, tissue damage, organ failure and shock.
Pneumonic plague occurs when the bacteria infect the lungs. It can develop when another form of plague spreads to the lungs or when a person inhales the bacteria directly. Symptoms can develop rapidly and include fever, weakness, chest pain, shortness of breath and coughing, sometimes with bloody sputum.
Does plague still exist today?
Yes. The bacteria persist in wild animal populations in parts of Africa, Asia and the Americas, meaning plague can’t realistically be eradicated.
The WHO recorded 3,847 suspected human cases and 423 deaths in 10 countries from 2019 through 2025. Most occurred in the Democratic Republic of the Congo and Madagascar.
Cases also occur occasionally in wealthier countries. The US typically records several infections a year, mostly in western states where the bacteria circulate naturally among wild rodents and their fleas.
How dangerous is pneumonic plague?
Antibiotics, modern sanitation and disease surveillance mean plague no longer poses anything like the threat it did centuries ago. Still, it’s very dangerous if it isn’t recognized and treated quickly.
Pneumonic plague is the most rapidly progressing form of the disease. Symptoms can appear within one to three days of exposure. Without effective antibiotics, the infection can kill within about a day of severe symptoms developing.
That makes early treatment critical. The WHO says common antibiotics are effective against Yersinia pestis and the chances of recovery are high when pneumonic plague is detected and treated promptly. People known to have been exposed can also be given antibiotics before they become sick.
The short incubation period also means infections typically become apparent relatively quickly. Several days after the Russian worker died, there was still no confirmation that she had plague. Russian authorities told the WHO that medical observation of all identified contacts had been completed and that no high-threat pathogens were detected among them.
How easily does pneumonic plague spread?
Pneumonic plague is the only major form of plague that can spread directly between people.
An infected person can release bacteria in respiratory particles when coughing. Transmission generally requires close exposure to somebody who is sick, particularly when the patient is coughing. Unlike Covid-19 or influenza, plague isn’t known for sustained transmission through communities by people with mild or no symptoms.
People with pneumonic plague usually become severely ill within a short period, which can help health authorities identify cases and trace their contacts. Still, because the disease progresses rapidly and can spread between people, even a single suspected case requires an urgent public-health response.
When pneumonic plague is suspected, health authorities generally act before waiting for laboratory confirmation. The WHO recommends starting appropriate antibiotics, as well as identifying and monitoring close contacts and generally giving them preventive antibiotics for seven days.
Why does Russia have an “anti-plague” institute?
Anti-plague institutes have a long history in Russia and other parts of the former Soviet Union.
Plague occurs naturally in wild rodents across parts of Central and northern Asia, including Siberia, Mongolia and northern China. Russia has long operated a network of specialist laboratories and monitoring stations to detect plague in animals, investigate human infections and prevent outbreaks.
The Irkutsk institute was established in 1934 specifically to combat plague in Siberia and the Russian Far East. Its responsibilities later expanded to other dangerous infections including cholera, anthrax and brucellosis, as well as other diseases that can spread from animals to people.
Today, the institute says it monitors areas where plague circulates naturally across Siberia and the Far East, conducts disease surveillance and diagnostic testing, advises regional health authorities and helps respond to outbreaks of dangerous infections.
Until the Soviet Union collapsed in 1991, it also operated a secret biological weapons program that included research on Yersinia pestis. That history has contributed to international scrutiny of the Siberian incident, although there is no public evidence linking the Irkutsk worker’s death to any biological weapons research.
Disclaimer: This report is auto generated from the Bloomberg news service. ThePrint holds no responsibility for its content.