Toxoplasmosis and cats during pregnancy: can you keep your cat?

What is toxoplasmosis?

Toxoplasmosis is a parasitic infection caused by Toxoplasma gondii, an intracellular protozoan found worldwide. According to ANSES, this parasite can infect nearly all warm-blooded animals, including humans. The definitive host, meaning the only organism in which the parasite can complete its sexual reproduction cycle, is the cat (and more broadly, felines).

In healthy adults, the infection most often goes unnoticed or manifests as mild flu-like symptoms. It then confers lifelong immunity. In France, approximately 45% of women of childbearing age are immune (Santé Publique France). The problem arises when a non-immune pregnant woman contracts the infection for the first time during pregnancy: the parasite can then cross the placenta and reach the fetus, causing what is known as congenital toxoplasmosis.

To learn everything about toxoplasmosis during pregnancy (serology, prohibited foods, treatment in case of seroconversion), see our complete guide on toxoplasmosis and pregnancy. In this article, we focus specifically on the question of cats and the precautions to take with your pet.

How do cats transmit toxoplasmosis?

The cat plays a central role in the Toxoplasma gondii cycle because it is the only animal in whose intestine the parasite can reproduce sexually. Here is how the cycle works:

1. Cat infection: the cat becomes infected by hunting and consuming an infected prey (rodent, bird) or by ingesting raw meat containing parasite cysts.
2. Oocyst excretion: in the days following its infection, the cat begins to excrete millions of oocysts (resistant forms of the parasite) in its feces. This excretion lasts on average 1 to 3 weeks, then stops. The cat develops immunity and generally will not excrete oocysts again afterward.
3. Maturation in the environment: freshly excreted oocysts are not immediately infectious. They must undergo a maturation phase (sporulation) in the environment, which takes 1 to 5 days depending on temperature and humidity. This is a crucial point for prevention.
4. Human contamination: humans can become infected by accidentally ingesting sporulated oocysts, for example by putting hands to the mouth after handling the litter box or contaminated soil, or by consuming unwashed fruits and vegetables soiled with contaminated soil.

What is the real risk?

The fear of cats among pregnant women is largely disproportionate to the actual risk. Here are the figures that put things in perspective:

• According to EFSA (European Food Safety Authority), only 1% of domestic cats excrete oocysts at any given time. In other words, the probability that your cat is in an active excretion phase at the exact moment you clean its litter box is very low.
• A cat only produces oocysts for 1 to 3 weeks over its entire life, during its primary infection. After this period, it develops immunity and no longer poses a transmission risk.
• The risk is primarily linked to cats that hunt. An indoor cat fed exclusively with commercial food has virtually no chance of becoming infected.
• According to ANSES, the most common route of contamination in humans is not the cat but consumption of raw or undercooked meat. Contact with the litter box ranks far behind in contamination statistics.

Risk level summary table

These data clearly show that the risk from cats is manageable with simple measures. Under no circumstances does it justify abandoning the animal, which causes thousands of cats to be needlessly abandoned each year.

The litter box: golden rules

The cat's litter box is the main point of contact between contaminated feces and the pregnant woman. Prevention measures therefore focus primarily on it. Here are the rules to follow throughout the entire pregnancy:

1. Delegate litter box cleaning

This is rule number one. Ask your partner, a family member, or a roommate to take care of cleaning the litter box for the entire duration of the pregnancy. This is the simplest and most effective measure to eliminate any risk of contamination.

2. If you must clean it yourself

If no one else can take care of it, protect yourself:

• Wear disposable gloves for each cleaning.
• Wash your hands thoroughly with soap immediately afterward, even if you wore gloves.
• Avoid touching your face during cleaning.

3. Change the litter daily

This is a fundamental point that is often overlooked. Oocysts excreted in the cat's feces only become infectious after a delay of 1 to 5 days of maturation (sporulation) in the environment. By changing the litter every day, you eliminate the oocysts before they become dangerous. This simple action considerably reduces the risk, even if your cat is in an active excretion phase.

4. Place the litter box in the right location

• Away from the kitchen and food preparation areas.
• Away from the dining table and areas where you eat.
• In a well-ventilated location that is easy to clean.

5. Disinfect the box regularly

Clean the litter box itself with boiling water at least once a week. Regular bleach is not effective against Toxoplasma gondii oocysts, but heat (above 70 °C) destroys them. Therefore, use very hot or boiling water to clean the box.

Can you pet your cat while pregnant?

Yes, you can continue to pet your cat with complete peace of mind. This is one of the most widespread and most incorrect misconceptions: many pregnant women think that simply touching a cat puts them at risk for toxoplasmosis. The reality is different.

Toxoplasma gondii oocysts are excreted in the cat's feces, not on its fur. Studies show that contamination through simple contact with a cat's fur is considered extremely rare, even theoretical. The parasite does not attach to the fur in any significant way.

That said, as a reasonable precaution:

• Wash your hands after petting your cat, especially before eating or preparing a meal.
• Avoid letting your cat climb on the kitchen counter or the dining table (a good habit to have at all times).
• If your cat is an outdoor hunter, avoid letting it lick your face or hands, as a general hygiene precaution.

In summary: cuddling with your cat poses no problem. Continue to enjoy its company and comfort during your pregnancy.

Indoor cat vs outdoor cat: a very different risk

Not all cats present the same level of risk regarding toxoplasmosis. The distinction between indoor and outdoor cats is fundamental.

Indoor cat (100% apartment living)

A cat that has never set foot outdoors and is fed exclusively with commercial food (kibble, canned food) has virtually no chance of having been in contact with the parasite. To become infected, a cat must ingest oocysts (present in the soil) or tissue cysts (present in the raw meat of a prey). An apartment cat fed commercial food has access to none of these sources.

According to EFSA, the risk of toxoplasmosis from a strictly indoor cat is virtually zero. If your cat has never been outside and you do not feed it raw meat, you can be reassured.

Outdoor cat or cat with garden access

A cat that goes outdoors and hunts (rodents, birds, lizards) may have been in contact with the parasite. However, even in this case, the risk remains limited:

• The cat only excretes oocysts for 1 to 3 weeks during its primary infection, then never again (except in cases of exceptional immunosuppression).
• If your cat is an adult and has been going outside for a long time, there is a strong chance it has already been infected and is now immune.
• Following the litter box hygiene rules (daily cleaning, gloves, hand washing) is sufficient to manage the risk.

Garden and soil: beware of contaminated ground

While the domestic cat gets all the attention, people often forget that the garden soil can be a more insidious source of contamination. Stray cats or neighborhood cats regularly defecate in gardens, sandboxes, and vegetable gardens. Their feces decompose and the oocysts mix with the soil, where they can survive several months, even more than a year in moist soil (according to ANSES).

Here are the precautions to take if you garden during pregnancy:

• Wear gardening gloves for all soil handling, even for simple weeding or planting work.
• Wash your hands thoroughly after any contact with soil, even if you wore gloves.
• Avoid touching your face or mouth during gardening.
• Wash thoroughly fruits and vegetables harvested from your garden before consuming them. Soaking in vinegar water enhances cleaning.
• If you have a sandbox for your children, cover it with a tarp when not in use to prevent cats from defecating in it.

These precautions apply whether you have a cat or not. Stray cats are far more numerous than domestic cats in excreting oocysts into the environment, as they hunt regularly and are more often in contact with infected prey.

Other pets

Toxoplasmosis is often associated with cats in the public imagination, which leads some pregnant women to worry about all their animals. Let's set the record straight:

Dogs

Dogs do not transmit toxoplasmosis. They can be infected by the parasite (intermediate host), but they do not excrete oocysts in their feces. Only felines (cats, lions, tigers, etc.) are capable of excreting the infectious form of the parasite. You can continue to live with your dog without any special precautions related to toxoplasmosis.

Rodents, rabbits, pet birds

These animals play no role in the transmission of toxoplasmosis to humans. Rodents and birds can be intermediate hosts of the parasite (it is by hunting them that cats become infected), but they do not excrete oocysts. No specific precautions are necessary.

Reptiles and fish

No link to toxoplasmosis. These animals are not involved in the Toxoplasma gondii parasite cycle.

When to see a doctor

Serological monitoring for toxoplasmosis is part of the standard pregnancy care pathway in France. If you are not immune, a monthly blood test is performed to detect possible seroconversion. But beyond this regular monitoring, certain situations should prompt you to consult quickly:

Toxoplasmosis serology

A simple blood test at the beginning of pregnancy determines whether you are immune (IgG positive, IgM negative) or not. If you are immune, no specific precautions are necessary regarding toxoplasmosis. If you are not, a monthly check will be performed throughout the pregnancy. To learn more about interpreting results, see our complete article on toxoplasmosis and pregnancy.

Symptoms to watch for

Consult your doctor or midwife if you experience the following symptoms, especially if you are not immune and have been in contact with a risk situation (litter box, soil, undercooked meat):

• Unusual and persistent fatigue that cannot be explained by the pregnancy alone
• Moderate fever (around 38 °C) without an obvious cause
• Swollen lymph nodes in the neck or back of the neck
• Unusual muscle pain

These symptoms are not specific to toxoplasmosis (they can suggest many benign infections), but they warrant an early serological check to verify the absence of seroconversion. Remember that in the vast majority of cases, toxoplasmosis is completely asymptomatic, hence the importance of monthly blood screening.

To learn more about other foodborne infections to watch for during pregnancy, also see our article on listeriosis and pregnancy.

Our expert's opinion

Dr. Elie Servan-Schreiber, physician:

“The question of cats during pregnancy comes up in almost all my consultations with expectant mothers. I regularly see patients anxious about having to part with their animal. I want to reassure them: it is completely unnecessary. The risk of contracting toxoplasmosis from a domestic cat is minimal if basic hygiene rules are followed. The most important measure is not to handle the litter box yourself, or failing that, to wear gloves and change it every day. In reality, the most significant risk of contamination comes from food — undercooked meat and poorly washed raw vegetables — far more than from the cat itself. Keep your companion, enjoy its purring, and focus your prevention efforts on your plate and hand hygiene.”