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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsPlague is a potentially life-threatening infection caused by the bacterium Yersinia pestis. It is treatable with antibiotics, but suspected plague needs immediate medical assessment: when clinicians strongly suspect it, treatment should begin without waiting for final test results. Seek urgent care for compatible symptoms after a possible exposure, especially in a place where plague occurs.
What plague is
Yersinia pestis infects people and other mammals. In nature, it circulates among small mammals and their fleas. People most often become infected through the bite of an infected flea; handling an infected animal is another possible route. Plague remains naturally present in parts of the western United States and in certain regions of Africa and Asia.
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The infection can affect lymph nodes, the bloodstream, or the lungs. These forms have different symptoms and risks, and one form can develop from another.
Symptoms and the three forms of plague
| Form | Main site and symptoms | Incubation and transmission context |
|---|---|---|
| Bubonic | Lymph nodes. Fever, headache, chills, and weakness commonly occur with one or more painful, swollen lymph nodes called buboes. Untreated infection can spread beyond the nodes. | CDC gives a usual incubation period of two to eight days. Infected flea bites are a common route. |
| Septicemic | Bloodstream. Symptoms can include fever, chills, extreme weakness, abdominal pain, shock, bleeding, and tissue death, especially in the fingers, toes, or nose. | Can occur initially or develop from untreated bubonic plague. |
| Pneumonic | Lungs. Fever, headache, weakness, rapidly developing pneumonia, shortness of breath, chest pain, and cough; sputum may be bloody or watery. | CDC gives a usual incubation period of one to three days. This is the form that can spread between people through respiratory droplets. |
WHO’s 2026 fact sheet gives a one-to-seven-day typical incubation period across plague generally. The form-specific CDC ranges above are more useful when describing bubonic and pneumonic disease. Symptoms do not always arrive as a complete or predictable set, so do not wait for every listed sign before seeking care.
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Plague is serious, but prompt diagnosis and appropriate antibiotics can save lives. WHO reports a 30% to 60% case-fatality ratio for bubonic plague; this is a published global figure, not a prediction for an individual. WHO states that pneumonic and septicemic plague are fatal when untreated.
How plague spreads
- Flea bites: The most common route for people is a bite from an infected flea.
- Contact with infected animals: Handling an infected animal’s tissues or body fluids can expose a person to the bacteria.
- Respiratory droplets: A person or animal with pneumonic plague can spread infectious droplets at close range. Person-to-person transmission is associated with direct, close respiratory exposure, not ordinary casual contact.
Pets matter to exposure risk. Dogs and cats can bring infected fleas into a home, and a cat with plague can pose a droplet exposure risk to owners and veterinary staff. A possible exposure is assessed in context, including animal or flea contact, location, and whether someone had close contact with a person or animal with pneumonic plague.
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Diagnosis and treatment
Clinicians assess symptoms and possible exposure and use laboratory testing of patient specimens, especially blood or material from a swollen lymph node. If plague is strongly suspected, CDC guidance is to collect samples when feasible and start treatment without waiting for final test results.
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Antibiotics treat plague. CDC’s U.S. clinical care guidance lists gentamicin and fluoroquinolones among first-line treatments and describes a typical treatment course of 10 to 14 days. Treatment may be extended if fever or other concerning signs continue. The appropriate medicine, route, and regimen depend on the patient’s severity of illness, age, health conditions, allergies, and other clinical factors; a clinician and public-health team should direct care. Do not try to treat suspected plague with leftover or self-selected antibiotics.
People with close exposure to a very sick person with pneumonic plague may be assessed and monitored. Preventive antibiotics may be considered based on the nature and timing of contact. Suspected cases should be reported to local and state health authorities, and patients with pneumonic signs need precautions to limit droplet spread.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to reduce exposure
- Reduce rodent food sources and habitat around homes, workplaces, and recreation areas.
- Wear gloves when handling or skinning animals that may be infected.
- Use flea repellent during outdoor activities where exposure is possible. CDC says products containing DEET can be applied to skin and clothing; permethrin products can be applied to clothing. Follow the product label. Repellents lower exposure risk but do not treat plague or replace medical care after a concerning exposure.
- Keep fleas off pets and seek veterinary care if a pet becomes sick. In areas where plague occurs, do not let free-roaming dogs or cats sleep on beds.
CDC says a plague vaccine is no longer available in the United States. Vaccines are in development, but CDC does not expect them to be commercially available in the immediate future.
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