CATS · Condition guide
Toxoplasmosis in cats: real cases and what owners should know
Toxoplasma gondii is a microscopic parasite that uses cats as its definitive host but can infect almost any warm-blooded animal — including humans. The vast majority of infected cats show no symptoms at all; most owners and most cats live entirely normal lives with low-level chronic infection. Cats shed infectious oocysts in their faeces only briefly (about 1-2 weeks) after first infection.
Clinical disease in cats — fever, weight loss, uveitis, neurological signs, pneumonia — is uncommon and usually associated with immunosuppression (FIV, FeLV, steroids). The bigger concern for owners is during pregnancy: primary toxoplasmosis acquired during pregnancy can affect the unborn baby. The good news is that the risk from a pet cat is small compared to undercooked meat and unwashed vegetables, and basic hygiene measures (daily litter scooping, gloves, hand washing) almost eliminate it.
What vets typically check for
- Serology (IgM and IgG) — distinguishes recent from chronic infection.
- PCR on aqueous humour or CSF when ocular or neurological signs are present.
- Clindamycin 10-12 mg/kg PO q12h for 4 weeks for clinically affected cats.
- Supportive care for severe systemic or neurological disease.
- Routine screening of healthy cats is generally not indicated.
Not a replacement for veterinary care. Use this to walk into the conversation prepared, not to self-diagnose.
Real cases from the veterinary literature
Peer-reviewed reports our semantic search surfaces for Toxoplasmosis in cats. Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Ante-mortem diagnosis, diarrhea, oocyst shedding, treatment, isolation, and genetic typing of Toxoplasma gondii associated with clinical toxoplasmosis in a naturally infected cat.
The Journal of parasitology · 2013 · United States
A 6-month-old male domestic cat was taken to the hospital because he was very tired, had stopped eating, had a fever, and was experiencing diarrhea. Tests showed that he had a very high number of Toxoplasma gondii oocysts (a type of parasite) in his feces and antibodies to the parasite in his blood. The cat was treated with an antibiotic called Clindamycin for 10 days, and afte
- Feline ocular toxoplasmosis
Veterinary Ophthalmology · 1998 · United States
Ocular toxoplasmosis is an eye infection caused by a parasite called Toxoplasma gondii, which is important to know about in cats. This infection can happen alongside a general infection in the body, but it's not clear how it specifically leads to inflammation in the front part of the eye in otherwise healthy cats. The article talks about the key features of this infection, how
- Management of bilateral uveitis in a Toxoplasma gondii-seropositive cat with histopathologic evidence of fungal panuveitis.
Veterinary ophthalmology · 2007 · United States
A 5-year-old, neutered male Domestic Short-haired cat was referred with a 5-month history of anterior uveitis and cataract in the right eye. Clinical examination confirmed anterior uveitis and immature cataract in the right eye and chorioretinitis in the left eye. Ocular ultrasound showed a retinal detachment in the right eye.
- Seropositivity for Toxoplasma gondii in cats with clinical signs and living in households with women of childbearing age.
Veterinary parasitology · 2024 · Italy
This study looked at the risk of a parasite called Toxoplasma gondii, which can be harmful to pregnant women and people with weakened immune systems, in domestic cats living with women of childbearing age. Researchers tested blood samples from 150 cats and found that about 31 of them, or 20.7%, had antibodies indicating they were exposed to the parasite. The study noted that ma
- Suspected toxoplasma-associated myocarditis in a cat.
Journal of feline medicine and surgery · 2005 · United Kingdom
Clinical toxoplasmosis is commonly reported in the cat, with the most consistent findings being ocular, pulmonic, hepatic, neurological, gastrointestinal and muscular abnormalities. Myocarditis, whilst frequently identified at post-mortem examination, has not been identified ante-mortem.
Frequently asked questions
- Do I have to give up my cat if I'm pregnant?
- Absolutely not. The CDC, RCOG, and every major obstetric body recommend keeping the cat. Most primary infections in pregnant women come from undercooked meat, unwashed produce, or gardening — not from pet cats. Have someone else clean the litter daily (oocysts take 1-5 days to become infectious), wash hands, and avoid raw meat.
- How long does my cat shed oocysts?
- Only 1-2 weeks following first-time infection — typically in kittenhood or after first hunting. After that, cats develop immunity and rarely shed again. Indoor cats fed commercial food have essentially zero risk of carrying or shedding Toxoplasma.
- Is there a vaccine?
- No licensed vaccine is currently available for cats or humans. Prevention relies on keeping cats indoors, feeding cooked or commercial food (not raw meat), and basic litter-box hygiene.