What exactly is tularemia and why do cats get it from rabbits?

Tularemia is caused by Francisella tularensis, a gram-negative bacterium so infectious that as few as 10 organisms can establish disease in a susceptible host, according to the CDC, which classifies it as a select agent of public health concern (Centers for Disease Control and Prevention, 2023). The bacterium's natural reservoir is wild rabbits, hares, and rodents such as voles and muskrats, which is why the disease earned the nickname "rabbit fever" long before veterinarians identified it in cats. Cats become infected far less often than dogs or livestock are exposed, but outdoor and hunting cats that catch or scavenge infected rabbits are at genuinely elevated risk compared to strictly indoor cats.

Geographic distribution matters here: tularemia has been documented in nearly every U.S. state except Hawaii, with case clusters historically concentrated in Arkansas, Missouri, Oklahoma, and Kansas, per USDA and CDC surveillance data (U.S. Department of Agriculture APHIS, 2022). Incidence rises in late spring and summer, tracking tick activity and rabbit population cycles, so a cat that roams rural or semi-rural land during warm months faces the highest seasonal exposure.

What are the first signs a cat owner usually notices?

The earliest and most consistent sign is a sudden, high fever, often 104 to 106°F, accompanied by a cat that goes from normal to profoundly listless within a day or two (Merck Veterinary Manual, 2022). Owners frequently describe a previously active cat suddenly refusing food, hiding, and showing little interest in interaction — signs easy to mistake for a minor illness until the fever spikes.

Enlarged, painful lymph nodes are another hallmark, particularly around the head, neck, or the site of a tick bite or scratch, and some cats develop visible abscesses or oral ulcers as the infection progresses (Merck Veterinary Manual, 2022). Because the bacterium targets the liver and spleen, abdominal discomfort and jaundice — a yellow tinge to the gums, skin, or the whites of the eyes — can appear as the disease advances, signaling that the infection has moved beyond a localized problem into systemic illness.

How is a cat actually exposed to Francisella tularensis?

Ticks are the primary vector, with the American dog tick (Dermacentor variabilis) and Lone Star tick (Amblyomma americanum) both capable of transmitting the bacterium during a blood meal, according to CDC vector-borne disease guidance (Centers for Disease Control and Prevention, 2023). A cat doesn't need a long attachment period for exposure — even brief tick contact in tick-dense habitats raises risk substantially during peak season.

Direct exposure is just as important a route in cats specifically: hunting, biting, or eating an infected rabbit or rodent can transmit the bacterium through mucous membranes or broken skin, and inhaling aerosolized bacteria from contaminated soil or a carcass is also documented as a transmission pathway (Merck Veterinary Manual, 2022). Cats that roam freely in areas with active rabbit die-offs are considered higher risk, which is one reason state health departments sometimes issue local advisories after unexplained rabbit deaths are reported.

How do veterinarians confirm tularemia instead of another fever-causing illness?

Because early signs overlap with other febrile illnesses — including feline panleukopenia, abscesses, or other tick-borne infections — veterinarians typically start with bloodwork showing nonspecific findings like elevated white blood cell counts and liver enzyme changes before pursuing bacterium-specific testing (Merck Veterinary Manual, 2022). Serologic antibody testing and PCR assays run through state public health or veterinary diagnostic laboratories are the definitive confirmation methods, since F. tularensis is difficult and hazardous to culture in a standard clinic setting.

Given the zoonotic risk, the CDC recommends that suspected tularemia cases be handled with specific laboratory biosafety precautions and reported to public health authorities, since select-agent status means many general diagnostic labs will forward samples to a reference laboratory rather than process them in-house (Centers for Disease Control and Prevention, 2023). This adds a day or two to definitive confirmation, which is why vets often begin treatment based on clinical suspicion rather than waiting on lab results.

What treatment actually works, and how fast do cats respond?

Aminoglycoside antibiotics, particularly gentamicin, are considered the most effective treatment for confirmed or strongly suspected tularemia in cats, with tetracyclines and fluoroquinolones used as alternatives or in combination depending on severity (Merck Veterinary Manual, 2022). Hospitalization with supportive intravenous fluids is standard for cats presenting with high fever, dehydration, and lethargy, since the infection can progress to sepsis if untreated.

Prognosis depends heavily on how quickly antibiotics start: cats treated early in the disease course have a meaningfully better chance of recovery than those diagnosed after the infection has already caused organ involvement or septicemia (Merck Veterinary Manual, 2022). Because untreated tularemia carries a real risk of death, veterinarians generally treat presumptively in endemic regions rather than delaying therapy for lab confirmation.

Can a person catch tularemia from a sick cat, and how do you protect the household?

Yes — tularemia is zoonotic, and the CDC has documented human infections traced to cat bites, scratches, and even aerosol exposure while a veterinarian was examining an infected cat's abscess, making this one of the more consequential zoonoses a cat owner may encounter (Centers for Disease Control and Prevention, 2023). Anyone handling a cat with suspected tularemia should wear gloves, avoid contact with draining abscesses or oral secretions, and wash hands thoroughly afterward.

Prevention at the household level centers on tick control using a veterinarian-recommended feline-safe product, keeping cats from roaming in areas with known rabbit die-offs, and discouraging hunting behavior where feasible, since indoor or supervised-outdoor cats have substantially lower exposure than free-roaming hunters (American Veterinary Medical Association, 2023). Owners in high-incidence states — Arkansas, Missouri, Oklahoma, and Kansas among them — should be especially attentive during the late spring through summer tick season.

What does long-term recovery and monitoring look like after treatment?

Cats that receive prompt antibiotic therapy typically show clinical improvement within several days, though a full course of treatment — often two to three weeks depending on the antibiotic and severity — is necessary to clear the infection completely rather than just resolve visible symptoms (Merck Veterinary Manual, 2022). Follow-up bloodwork is used to confirm that liver values and white blood cell counts have normalized before a veterinarian declares the infection resolved.

Cats with more severe presentations, particularly those with liver or spleen involvement or that developed sepsis, may need extended monitoring for organ function and slower reintroduction to normal activity. There's no vaccine for tularemia in cats, so recovered cats face the same future exposure risk as any other cat in an endemic area, making ongoing tick prevention and reduced hunting exposure the only real long-term safeguards (American Veterinary Medical Association, 2023).