Pneumonic plague is a serious form of plague in which the bacterium Yersinia pestis infects the lungs. It can cause fever, headache, weakness, rapidly developing pneumonia, shortness of breath, chest pain, and cough. If you have compatible symptoms and may have been exposed, seek immediate medical attention; do not wait to see whether symptoms improve.
What is pneumonic plague?
Plague is an infection caused by Yersinia pestis. Pneumonic plague is the form that affects the lungs. The World Health Organization describes it as the least common and most virulent form of plague. It can develop when plague bacteria spread to the lungs from another form of the disease, or when a person inhales infectious droplets from someone or an animal with pneumonic plague.
Plague also has bubonic and septicemic forms, involving the lymph nodes and bloodstream respectively. Symptoms alone cannot reliably tell these forms apart, and a person can develop pneumonic plague after infection has spread from another form.
What are the symptoms?
According to the CDC, pneumonic plague can cause:
- Fever
- Headache and weakness
- Rapidly developing pneumonia
- Shortness of breath and chest pain
- Cough, sometimes producing bloody or watery mucus
These symptoms can also occur with other illnesses, so they do not establish a diagnosis. If they occur after a possible exposure to plague, seek urgent professional assessment rather than trying to identify the illness at home.
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How quickly can symptoms begin?
After inhalation of infectious droplets, the CDC says symptoms can begin as soon as one day later. The WHO gives a usual incubation period of 3–7 days for plague generally. These figures refer to different contexts; neither is a guaranteed timeline for an individual case.
How does pneumonic plague spread?
Pneumonic plague can begin after bacteria reach the lungs from untreated bubonic or septicemic plague. It can also be acquired by inhaling infectious respiratory droplets coughed out by a person or animal with pneumonic plague.
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Person-to-person spread occurs through infectious droplets and typically requires direct, close contact. This does not mean every form of plague spreads between people: the WHO says bubonic plague is not transmitted person-to-person.
What should you do if you suspect pneumonic plague?
Get immediate medical attention for compatible symptoms with a possible exposure. The CDC advises not to wait for test results when plague is suspected: clinicians should decide whether to start treatment based on the person’s symptoms and exposure history. Plague is treatable, but prompt clinical care matters.
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Diagnosis requires laboratory testing. Depending on the suspected illness, clinicians may test appropriate specimens such as sputum or blood. In the United States, the CDC lists gentamicin and fluoroquinolones among first-line treatment options; clinicians select the medicine, route, and duration based on severity and individual patient factors. These are not instructions for self-treatment.
For suspected cases, clinicians should promptly notify local and state health departments. Patients with signs of pneumonic plague should be isolated and placed on droplet precautions to reduce the risk of transmission. These are clinical and public-health measures, not a home-care protocol.
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How can exposure be prevented?
The WHO recommends practical measures such as avoiding flea bites and not handling animal carcasses. Avoid direct contact with infected tissues and close exposure to people with pneumonic plague. Health workers should follow the precautions specified by their clinical and public-health authorities. If you believe you have been exposed, contact local medical or public-health authorities for guidance.
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Sources
- CDC: Signs and Symptoms of Plague (May 15, 2024)
- WHO: Plague
- CDC: How Plague Spreads (May 15, 2024)
- CDC: Clinical Care of Plague (May 15, 2024)
- CDC: Clinical Testing and Diagnosis for Plague (published May 15, 2024; updated and reviewed April 6, 2026)
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