Neurologic Toxoplasmosis in Rabbits: Seizures, Paresis, and Brain Inflammation

See your vet immediately if your rabbit has seizures, sudden weakness, collapse, or severe balance changes. Neurologic toxoplasmosis is a disease caused by the protozoal parasite Toxoplasma gondii. In rabbits, the parasite can spread beyond the intestines and affect the central nervous system, leading to encephalitis or meningoencephalitis, which means inflammation of the brain and its surrounding tissues.

This condition is considered uncommon in pet rabbits, but it can be severe when it happens. The neurologic signs are not unique to toxoplasmosis, which makes diagnosis challenging. A rabbit with seizures, paresis, tremors, circling, or behavior changes may have several possible causes, and your vet will usually need to work through a list of differentials before deciding how likely toxoplasmosis is.

Rabbits are intermediate hosts for T. gondii. Cats and other felids are the definitive hosts that shed environmentally resistant oocysts in feces. After exposure, rabbits may develop no signs at all, or they may develop systemic illness affecting the brain, lungs, liver, eyes, or muscles. When the brain is involved, signs can progress quickly and supportive care becomes very important.

Neurologic toxoplasmosis is caused by infection with Toxoplasma gondii. Rabbits usually become infected by ingesting infective oocysts from an environment contaminated with cat feces, or less commonly by eating feed, forage, or water contaminated with the parasite. Cats are the only animals that shed the oocyst stage in feces, and those oocysts usually need at least 24 hours in the environment before they become infective.

That timing matters for prevention, but it does not make the risk zero. Outdoor hay storage, access to gardens or yards used by cats, contaminated water, and exposure to feral or hunting cats can all increase risk. Indoor rabbits may still be exposed if contaminated produce, shoes, tools, or forage bring oocysts into the home.

Not every exposed rabbit becomes sick. In many species, infection can remain subclinical, while severe disease is more likely when parasites spread through tissues and trigger inflammation. In rabbits with neurologic signs, toxoplasmosis is only one possibility. Your vet may also consider Encephalitozoon cuniculi, middle or inner ear disease, trauma, toxins, bacterial infection, neoplasia, and other inflammatory brain disorders.

Diagnosis is usually a combination of history, neurologic exam, and ruling out more common causes. Your vet will ask about cat exposure, outdoor access, hay and produce handling, appetite, weight loss, and whether the signs started suddenly or gradually. Basic testing often includes bloodwork, urinalysis, and imaging when needed, although rabbits with encephalitis can still have nonspecific or even fairly normal routine lab results.

There is no single perfect test that confirms active neurologic toxoplasmosis in a living rabbit every time. Depending on the case, your vet may discuss serology for Toxoplasma gondii, paired titers, PCR on selected samples, or referral testing. These results must be interpreted carefully, because exposure does not always equal active brain infection. In many cases, diagnosis is presumptive, meaning your vet combines test results, clinical signs, and response to treatment.

Differentials are especially important in rabbits. E. cuniculi is a common infectious cause of rabbit neurologic disease, and ear disease can also mimic central nervous system problems. Advanced cases may need skull imaging, cerebrospinal fluid analysis, or referral-level neurology support, especially if seizures continue or the rabbit cannot eat without assistance.

Prevention focuses on limiting exposure to Toxoplasma gondii oocysts in the environment. Keep your rabbit away from cat litter, cat feces, and outdoor areas where cats may defecate. Store hay and pellets in sealed containers or protected indoor spaces when possible, and do not let cats access feed rooms, hay bales, or rabbit housing.

Wash leafy greens and herbs well, and use clean water sources. If you gather grass or forage from outside, avoid areas visited by cats. Garden produce, shoes, tools, and hands can all move contaminated soil indoors, so basic hygiene matters. If there is a household cat, feeding a commercial diet and preventing hunting or raw meat consumption can help reduce the cat's chance of becoming infected and shedding oocysts.

There is no commercial vaccine for toxoplasmosis in pet rabbits. Daily litter box cleaning is important for cats because freshly shed oocysts are not immediately infective and usually need at least a day in the environment to sporulate. For households with pregnant or immunocompromised people, discuss zoonotic precautions with both your physician and your vet, since toxoplasmosis is primarily a human health concern through contaminated food, soil, water, and cat feces.