Yes, cats can get bubonic plague, and they’re unusually susceptible to it. Unlike dogs, which rarely become seriously ill from the plague bacterium, cats develop the same swollen lymph nodes (called buboes) and lung involvement that humans do. The overall mortality rate in infected cats is roughly 50%, making plague one of the more dangerous infections a cat can contract.
How Cats Get Infected
Cats contract plague by hunting and eating infected rodents or being bitten by rodent fleas carrying the bacterium. In experimental studies where cats were fed a single plague-infected mouse, 38% died, 44% became sick but recovered, and 19% showed no signs of illness at all. That means even one infected rodent can be lethal.
Outdoor and semi-outdoor cats in endemic areas face the highest risk because they actively hunt the wild rodents that carry the disease. Prairie dogs, ground squirrels, wood rats, and other small mammals serve as natural reservoirs. A cat doesn’t need to eat the rodent to become infected; a single flea bite from an infected rodent flea is enough.
Where Plague Is Found
In the United States, plague is concentrated in the rural western states. The highest-risk zones are northern New Mexico, northern Arizona, and southern Colorado. A second cluster spans California, southern Oregon, and far western Nevada. Nearly all U.S. cases in the past two decades have occurred in small towns, villages, and agricultural areas rather than cities. Globally, most human plague cases since the 1990s have occurred in Africa, with additional activity in parts of Asia and South America.
If you live outside these regions, the risk to your cat is extremely low. If you live in or travel to these areas with your cat, prevention matters significantly more.
Symptoms and How Fast They Appear
After exposure, symptoms can appear in as few as one to three days. The earliest signs are nonspecific: lethargy, loss of appetite, and high fever. These show up across all three forms of the disease.
In the bubonic form, which is the most common, swollen lymph nodes develop under the jaw. These buboes can grow large enough to see or feel, and they sometimes abscess and drain. The tricky part is that abscessed lymph nodes from plague can look identical to abscesses from cat bite wounds, which are far more common. This similarity is one reason plague in cats sometimes gets missed or diagnosed late.
The septicemic form spreads through the bloodstream and can involve any organ. Cats with this form can deteriorate into shock and die within 48 hours. Both the bubonic and septicemic forms can progress to pneumonic plague, where the infection reaches the lungs and the cat may develop a cough or difficulty breathing. This progression is the most dangerous scenario, not just for the cat but for the people around it.
The Risk to You and Your Family
Cats with plague pose a real transmission risk to humans. This isn’t theoretical. In January 2024, a person in Oregon contracted plague directly from an infected pet cat. Transmission can happen through bites, scratches, or direct contact with infected fluids. Pneumonic plague in cats is especially concerning because the bacteria can spread through respiratory droplets when the cat coughs or sneezes, potentially infecting anyone nearby.
Dogs, by comparison, rarely transmit plague to humans because they typically fight off the infection without developing significant illness. Cats are the domestic animal most likely to bring plague into a household.
Diagnosis and Treatment
Veterinarians confirm plague through laboratory culture of the bacterium, which provides definitive identification. Faster preliminary results come from PCR testing and a technique called direct fluorescent antibody testing. If you live in an endemic area and your cat develops a sudden high fever with swollen lymph nodes under the jaw, especially during the warmer months when fleas are most active, mention the possibility of plague to your vet. Early suspicion is critical because the disease progresses fast.
Cats with plague are treated with antibiotics, and early treatment significantly improves survival. However, a cat with a persistently high fever carries a poor prognosis even with treatment. The septicemic form can kill within two days, so timing matters enormously. Cats that receive antibiotics early in the bubonic stage have the best chances of recovery.
During treatment, precautions are essential to protect veterinary staff and household members from exposure. Cats with suspected or confirmed plague are typically handled with strict isolation protocols.
Protecting Your Cat
Flea control is the single most important preventive measure. Monthly topical treatments are widely available and effective at killing fleas before they can transmit the bacterium. Your vet can recommend the right product for your cat’s age and lifestyle. Consistency matters: a single missed month during peak flea season can leave your cat vulnerable.
Treating only the cat isn’t always sufficient. Flea eggs and larvae accumulate in bedding, carpeting, and soil around the home. An integrated approach that addresses the environment, not just the animal, reduces the chance of reinfestation. If you have multiple pets, all of them need flea treatment, even if only one goes outdoors.
Beyond flea control, limiting your cat’s hunting is the most practical way to reduce exposure. Keeping cats indoors eliminates the risk almost entirely. If your cat does go outside in an endemic area, watch for die-offs of wild rodents nearby, which can signal active plague in the local wildlife population and a surge of fleas looking for new hosts.