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.
- The Potential of MIC17A both as an Entero-epithelial and Chronic Stage Marker for Detection of Feline Toxoplasmosis.
Current microbiology · 2026
A study found that a specific protein called MIC17A can help detect toxoplasmosis in cats, which is an infection caused by a parasite. Researchers tested blood samples from 422 cats, some of which were already confirmed to have the infection through a PCR test. They discovered that the MIC17A test identified more cases than traditional methods, showing it could be useful for bo
- Identification of a mouse-virulent recombinant type I/III Toxoplasma gondii strain in liver cytology of an immunosuppressed cat infected with FeLV-C subgroup.
Veterinary research communications · 2025
A 5-year-old Siamese cat with Feline Leukemia Virus (FeLV) was brought in after two months of worsening lethargy, lack of appetite, weight loss, and anemia. Despite previous treatments for a suspected infection, the cat's condition worsened, leading to severe symptoms like fever, respiratory distress, and seizures. Tests revealed the presence of Toxoplasma gondii, a parasite th
- Disclosing coinfections: The interaction between Toxoplasma gondii and hemotropic agents in Colombian dogs and cats.
Comparative immunology, microbiology and infectious diseases · 2025
A study found that many dogs and cats in Colombia tested positive for Toxoplasma gondii, a parasite that can cause health issues. Among the 590 animals tested, 44% were positive, with a significant number also having other infections, like Rickettsiales and Mycoplasma. In dogs, about 74% had these additional infections, while in cats, around 72% did. The presence of these coinf
- Toxoplasmal meningoencephalitis in a 14 week-old shelter cat with presumed feline infectious peritonitis.
Veterinary parasitology, regional studies and reports · 2025 · United States
A 7-week-old female domestic shorthair kitten from a shelter was brought in because she was losing weight and seemed less active, showing signs of "failure to thrive." As her condition worsened, she developed neurological problems, leading the vet to suspect feline infectious peritonitis (FIP) or other serious issues. Unfortunately, due to her poor prognosis, euthanasia was cho
- Evaluation of a DNA vector plasmid encoding a partial rop18 gene from toxoplasma gondii in domestic cats as a vaccine candidate.
Vaccine · 2025 · Brazil
Four domestic cats were given a potential vaccine to help protect against Toxoplasma gondii, a parasite that can cause health issues. Two of the cats received a DNA vaccine containing a part of the parasite's gene, while the other two received a control treatment. After a series of immunizations, all cats were exposed to the parasite, and those that received the vaccine shed 53
- <i>Toxoplasma gondii</i> Seroprevalence and Risk Factors in Feline Patients Admitted to a Small Animal Veterinary Teaching Hospital in Central Germany over 11 Years (2012–2023)
Pets · 2025 · CH
A study looked at 174 cats admitted to a veterinary hospital in Germany over 11 years to see how many had been infected with Toxoplasma gondii, a parasite that can cause health issues. Many of the cats showed symptoms like neurological problems, difficulty moving, or eye issues, with older cats being more likely to test positive for the infection. The research found that outdoo
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.