A suspected pneumonic plague death at a Siberian research institute has triggered a quarantine of over 200 contacts and heightened concern, with local officials labeling it a "particularly dangerous infection" and the White House monitoring the situation. Pneumonic plague, the most serious form of the disease caused by Yersinia pestis, can spread person-to-person via airborne droplets, requiring close contact. Symptoms include rapid pneumonia, shortness of breath, and chest pain.

A suspected pneumonic plague death at a Siberian research institute has triggered a quarantine of over 200 contacts and heightened concern, with local officials labeling it a "particularly dangerous infection" and the White House monitoring the situation. Pneumonic plague, the most serious form of the disease caused by Yersinia pestis, can spread person-to-person via airborne droplets, requiring close contact. Symptoms include rapid pneumonia, shortness of breath, and chest pain.

A suspected pneumonic plague death at a Siberian research institute has triggered a quarantine of over 200 contacts and heightened concern, with local officials labeling it a "particularly dangerous infection" and the White House monitoring the situation. Pneumonic plague, the most serious form of the disease caused by Yersinia pestis, can spread person-to-person via airborne droplets, requiring close contact. Symptoms include rapid pneumonia, shortness of breath, and chest pain.

Russia is on high alert after a Siberian lab technician died of suspected pneumonic plague at the Irkutsk Anti-Plague Research Institute. Over 200 people who came in contact with the deceased have been quarantined. Irkutsk officials have so far called the illness only a “particularly dangerous infection”.

The White House is also monitoring the situation, as an official said that the Trump administration is "aware, monitoring the outbreak and assessing the options," Axios reported.

What is a plague?

A plague is a severe, potentially fatal infectious disease caused by the zoonotic rod-shaped bacterium Yersinia pestis. It is primarily found in small mammals and the fleas that feed on them.

According to the CDC, plague symptoms depend on how the patient was infected.

Plague manifests in three distinct clinical types: bubonic plague, septicemic plague, and pneumonic plague.

Pneumonic plague develops when bacteria spread to the lungs of a patient with untreated bubonic or septicemic plague, or when a person inhales infectious droplets coughed out by another person or animal with pneumonic plague.

Pneumonic plague is the most serious form of the disease and is the only form of plague that can be spread from person to person.

What are the symptoms?

Symptoms include fever, headache, weakness, and a rapidly developing pneumonia with shortness of breath, chest pain, cough, and sometimes bloody or watery mucus.

How does the infection spread?

Pneumonic plague spreads through airborne droplets expelled when infected humans or animals cough. Transmission usually requires direct, close contact.

These droplets are the only way that plague can spread between people.

Person-to-person spread has not been documented in the United States since 1924, but there have been reports of rare cases of pneumonic plague among people exposed to sick cats, as they are more prone to get infected by rodents.

How person-to-person airborne transmission occurs

Respiratory droplets: When an infected person or animal coughs, sneezes, or talks, they expel microscopic liquid droplets containing Y. pestis into the air.

Close contact required: Transmission generally requires direct, close contact—typically within 6 feet (2 meters)—with a patient who is coughing or coughing up bloody sputum.

Occupational incidents

Accidental exposure: In laboratory settings, pneumonic plague can be contracted if containers with live bacteria break or are mishandled, releasing infectious aerosols.

Handling Tissues/autopsies: Direct contact with infected animal carcasses or performing autopsies on human corpses without appropriate respiratory PPE can also spread the infection.

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