Congenital Toxoplasmosis

What is Congenital Toxoplasmosis?

Congenital toxoplasmosis is a condition that happens when a pregnant woman gets infected with a parasite called Toxoplasma gondii for the first time. This parasite can pass from mother to baby through the placenta during pregnancy. The infection can cause serious health problems for the developing baby.

Toxoplasma gondii is a common parasite found in cat feces, contaminated soil, and undercooked meat. Most healthy adults who get infected have no symptoms or only mild flu-like symptoms. However, when a woman catches this infection during pregnancy, her unborn baby faces significant risks. The earlier in pregnancy the infection occurs, the less likely it is to pass to the baby, but the more severe the consequences if it does.

This condition can lead to a range of complications from mild to severe. Some babies show signs at birth while others develop problems months or years later. Early detection through testing during pregnancy allows doctors to provide treatment that may reduce the risk of passing the infection to the baby or lessen its effects.

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Symptoms

Many babies with congenital toxoplasmosis appear healthy at birth. Symptoms may not show up until months or even years later. When symptoms do appear at birth or shortly after, they may include:

Premature birth or low birth weight
Fever and jaundice, which is yellowing of the skin and eyes
Enlarged liver or spleen
Eye problems including inflammation of the retina and abnormal eye development
Fluid buildup in the brain or an abnormally small or large head
Seizures or developmental delays
Hearing loss
Skin rashes or bruising

About 90 percent of babies with congenital toxoplasmosis show no obvious signs at birth. However, many of these children develop serious eye or brain problems later in life if the infection goes untreated.

Causes and risk factors

Congenital toxoplasmosis is caused when a woman becomes infected with Toxoplasma gondii for the first time during pregnancy or shortly before conception. The parasite lives in the intestines of cats and is shed in their feces. People can become infected by accidentally ingesting the parasite from contaminated soil, cat litter, or surfaces that have come into contact with infected cat feces. Eating undercooked or raw meat, especially pork, lamb, or venison, is another common way to get infected.

Women who have had toxoplasmosis before pregnancy are generally protected because their immune system has built defenses against the parasite. The main risk is a first-time infection during pregnancy. Risk factors include owning cats or cleaning litter boxes, gardening without gloves, eating raw or undercooked meat, and drinking untreated water. The risk of transmission and severity depends on when during pregnancy the infection occurs. First trimester infections are less likely to transmit but more severe if they do. Third trimester infections are more likely to transmit but often less severe.

How it's diagnosed

Congenital toxoplasmosis is diagnosed through a combination of maternal screening during pregnancy and testing of the newborn. Pregnant women can be tested for Toxoplasma antibodies through blood tests. The Toxoplasma Antibody IgG test shows whether a woman has ever been infected. Additional IgM antibody testing can help determine if an infection is recent or occurred in the past. If a recent infection is suspected during pregnancy, amniocentesis may be performed to test the amniotic fluid for the parasite.

For newborns suspected of having congenital toxoplasmosis, doctors perform specialized blood tests, eye examinations, hearing tests, and brain imaging. Blood tests look for Toxoplasma antibodies that the baby's own immune system has produced, not just antibodies passed from the mother. Talk to your doctor about testing if you are pregnant or planning to become pregnant. They can order the appropriate specialized tests and interpret results in the context of your pregnancy.

Treatment options

Treatment for congenital toxoplasmosis typically includes:

Antiparasitic medications such as pyrimethamine and sulfadiazine for the baby, usually for the first year of life
Folinic acid supplements to prevent side effects from antiparasitic drugs
Corticosteroids if there is active eye inflammation or high protein levels in spinal fluid
Regular monitoring by specialists including ophthalmologists, neurologists, and developmental pediatricians
Early intervention services for developmental delays or learning difficulties
Treatment for specific complications such as seizures or hearing loss as they arise

For pregnant women who test positive for acute toxoplasmosis, treatment with antibiotics like spiramycin may reduce the risk of transmission to the baby. If the baby is confirmed to be infected before birth, stronger medications may be started. Prevention is important for pregnant women. This includes cooking meat to safe temperatures, washing fruits and vegetables, avoiding cat litter, wearing gloves while gardening, and washing hands thoroughly after handling raw meat or soil.

Frequently asked questions

Yes, pregnant women can reduce their risk significantly through simple precautions. Cook meat to safe internal temperatures, wash all fruits and vegetables, avoid changing cat litter when possible, wear gloves while gardening, and wash hands thoroughly after handling raw meat. Women who are planning pregnancy can ask their doctor about testing for prior Toxoplasma infection. If you have already been infected before pregnancy, your baby is generally protected.

In the United States, congenital toxoplasmosis occurs in about 1 to 10 babies per 10,000 live births. The risk depends on when a pregnant woman becomes infected. If infection occurs in the first trimester, only about 10 to 25 percent of babies become infected, but consequences are often severe. If infection occurs in the third trimester, 60 to 90 percent of babies become infected, but symptoms are usually milder.

No, about 90 percent of infected babies appear healthy at birth. However, most of these children will develop problems later in life if left untreated. Eye problems are the most common late complication, affecting up to 85 percent of untreated children. This is why early testing and treatment are so important, even when babies seem healthy at birth.

Toxoplasmosis is the infection itself, which usually causes mild or no symptoms in healthy people. Congenital toxoplasmosis specifically refers to babies who get the infection from their mothers during pregnancy. While most adults recover from toxoplasmosis easily, babies with congenital infection can have serious long-term health problems affecting their eyes, brain, and development.

Routine screening for toxoplasmosis during pregnancy is not standard practice in the United States. However, it is common in some European countries. Women at higher risk, such as those who own cats, work with animals, or eat raw meat, should discuss testing with their doctor. If you develop flu-like symptoms during pregnancy or have known exposure to the parasite, testing is recommended.

This is very rare in women with healthy immune systems. If you were infected with Toxoplasma before pregnancy, your immune system has built protection that prevents the parasite from being active during pregnancy. However, women with weakened immune systems, such as those with HIV, may reactivate a prior infection during pregnancy. These women need special monitoring and treatment.

The most common long-term problem is eye disease, which can appear or worsen years after birth and potentially lead to vision loss. Brain problems can include intellectual disabilities, learning difficulties, seizures, and hearing loss. Some children develop motor problems or delays in reaching developmental milestones. Regular follow-up with specialists throughout childhood is important to catch and treat problems early.

Currently, there is no vaccine available for humans to prevent toxoplasmosis. Research is ongoing, but prevention relies on avoiding exposure to the parasite. Pregnant women and those planning pregnancy should follow food safety guidelines and avoid contact with cat feces. A vaccine does exist for sheep to prevent toxoplasmosis-related pregnancy loss in livestock.

Treatment typically lasts for the entire first year of life. Babies receive antiparasitic medications along with folinic acid to prevent side effects. The exact duration and intensity depend on the severity of infection and how the baby responds. After treatment ends, children need ongoing monitoring with regular eye exams and developmental assessments throughout childhood.

Yes, breastfeeding is safe even if you had toxoplasmosis during pregnancy. The parasite is not transmitted through breast milk in women with healthy immune systems. Breast milk provides important antibodies and nutrients that support your baby's health and development. Continue breastfeeding unless your doctor advises otherwise for a specific medical reason.