Feline Toxoplasmosis — Infection Risks for Pregnant Women and Prevention Guide

Infection/ParasitesDiseasesMeongsiljang Veterinary Advisory Board

Feline toxoplasmosis is a zoonotic parasitic infection that can spread to humans through oocysts in cat feces. We’ve outlined the risks for pregnant women and preventive measures for households.

What is Feline Toxoplasmosis?

A calm house cat being examined by a veterinarian

Feline toxoplasmosis is a zoonotic disease caused by the protozoan parasite Toxoplasma gondii, which resides in the cat’s intestinal lining and sheds oocysts in its feces. Because it can be transmitted to humans, pet owners should take precautions. The key point is that it poses a risk only to pregnant women and immunocompromised individuals. Healthy adults who become infected usually experience no symptoms or only mild, cold-like symptoms. Proper management of feces, raw meat, and soil is far more important than worrying about the cat itself.

Infection Routes and Pathogenesis

Cats are typically infected for the first time by consuming infected rodents, birds, or raw meat. During this initial infection, the protozoa multiply in the intestines, and oocysts are shed in the feces; this shedding period lasts only about 1 to 3 weeks after the first infection. After subsequent exposures, shedding is minimal. Humans commonly become infected by handling cat feces containing oocysts and then touching their mouths, or by eating undercooked pork or lamb, or unwashed vegetables. In other words, foodborne transmission is actually a more common route of human infection than direct contact with cats.

Symptom Checklist in Cats

While healthy adult cats often show no symptoms even when infected, kittens, immunocompromised cats, and those taking immunosuppressive medications (such as cyclosporine) may exhibit clear clinical signs. - Respiratory symptoms: Coughing, rapid breathing, pneumonia - Gastrointestinal symptoms: Decreased appetite, diarrhea, weight loss - Neurological symptoms: Abnormal gait, seizures, behavioral changes - Ocular symptoms: Uveitis, asymmetrical pupil size - Systemic symptoms: Fever, lethargy, jaundice

Close-up of a cat's eye showing signs of uveitis

Signs Pregnant Women Must Check Immediately

If a pregnant woman is infected for the first time during pregnancy, it can cause congenital toxoplasmosis in the fetus. The following situations require consultation with an obstetrician or infectious disease specialist: - If you have never had a toxoplasma antibody test since confirming your pregnancy - If you directly cleaned the litter box during pregnancy and are experiencing fever, swollen lymph nodes, or muscle pain - If your health deteriorates after consuming undercooked meat, raw ham, or unpasteurized dairy products Giving up your cat is not the solution. Proper litter box management and food hygiene are far more effective preventive measures.

Diagnostic Methods — Antibody Testing Over Fecal Testing

Detecting feline toxoplasmosis through fecal testing is challenging because the period during which oocysts are shed is short, lasting only one to three weeks. Consequently, there is a high likelihood that oocysts will not be present in the feces at the time of testing. Therefore, serum antibody tests (IgG and IgM) are typically used. IgM indicates recent infection, while IgG signifies past exposure. A presumptive diagnosis is made when clinical symptoms, such as uveitis, coincide with positive antibody titers. However, confirming the diagnosis can be difficult, so blood tests, biochemical analyses, and examinations of tissues or fluids from suspected affected areas are often employed in conjunction. Pregnant women should have their own antibody tests conducted by an obstetrician-gynecologist.

Treatment — Medications and Recovery Process

Treatment involves antiprotozoal medications, with clindamycin being the most commonly used first-line drug. In cases where clinical signs are clear, treatment is often started while waiting for test results, even at the suspicion stage. Cats taking immunosuppressants may require longer treatment due to delayed response or higher risk of relapse. The exact dosage and schedule should be determined by a veterinarian based on the cat’s weight and severity of symptoms. Never administer human medications without veterinary guidance.

A caregiver’s hand administering oral medication to a calm cat

Home Prevention — Safe for Pregnant Women

We’ve summarized the home prevention guidelines recommended in veterinary internal medicine textbooks in a way that’s easy for pet owners to understand. - Clean the litter box daily: The parasite only becomes infectious after being in the environment for more than 24 hours. Daily cleaning significantly reduces the risk. - Wear gloves and wash hands: Wash your hands with soap for at least 30 seconds after cleaning. - Pregnant women should avoid cleaning: If possible, have another family member handle litter box duties. - Feed only commercial pet food: Avoid raw meat or raw diets, especially during pregnancy. - Keep cats indoors: Prevent outdoor access and eliminate hunting opportunities. - Practice food hygiene: Cook meat thoroughly and wash vegetables and fruits under running water.

Important Note — There Is No Need to Give Up Your Cat

When you receive a positive pregnancy test, you may often hear advice to send your cat to another home. However, veterinary guidelines for preventing toxoplasmosis in pregnant individuals emphasize that practicing good hygiene—such as washing hands, removing feces daily (since oocysts require at least 24 hours to become infectious), thoroughly cooking meat, and avoiding having immunocompromised individuals or pregnant women clean the litter box—can significantly reduce the risk of infection while living with a cat. In fact, the stress of moving a cat to a new environment and the emotional toll on the owner may pose greater concerns. If you have concerns, consult both your physician and veterinarian to make a well-informed, rational decision.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

I'm pregnant and have a cat at home. Is it really safe?

Following basic hygiene practices—such as cleaning the litter box daily, washing your hands, delegating cleaning tasks to others, and avoiding raw meat—makes cat ownership safe for most people. For added peace of mind, consider getting tested for antibodies during early pregnancy.

If a cat tests positive for toxoplasmosis, does it pose a lifelong risk of transmitting the infection to humans?

Not at all. The period during which Toxoplasma gondii oocysts are shed in the feces is brief, typically lasting only one to three weeks after initial infection. After that time, shedding is minimal, so the risk of transmission through everyday cohabitation is very low.

Does a pregnant woman automatically get infected if she cleans the cat’s litter box?

Not at all. For infection to occur, the feces must contain oocysts, those feces must be left to age for at least 24 hours to become infectious, and then your hands must come into contact with your mouth. By cleaning up daily, wearing gloves, and washing your hands thoroughly, you can reduce the risk to nearly zero.

What are the more common ways people get toxoplasmosis?

As textbook prevention guidelines emphasize cooking meat thoroughly and maintaining hygiene with drinking water and vegetables, undercooked meat and contaminated food or water are just as significant routes of infection as cat feces.

Are there vaccines for cats?

There is currently no commercially available vaccine to prevent toxoplasmosis in cats. While a live vaccine called Toxovax is used to reduce abortion rates in sheep, it is not intended for use in cats. Therefore, the most effective way to prevent toxoplasmosis in cats is to keep them indoors, feed them only commercially prepared food, and prevent them from hunting.

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References

[1] Little SE. The Cat: Clinical Medicine and Management, 2nd Edition — Chapter on Zoonotic Parasites and Toxoplasmosis

[2] Bowman DD. Principles and Practices of Canine and Feline Clinical Parasitic Diseases — Chapter 16: Toxoplasma gondii

[3] Barrs VR, Martin P, Beatty JA. Antemortem diagnosis and treatment of toxoplasmosis in two cats on cyclosporin therapy. Aust Vet J. 2006;84:30–35

[4] Bernsteen L, Gregory CR, Aronson LR, et al. Acute toxoplasmosis following renal transplantation in cats. JAVMA