Toxoplasmosis

Toxoplasmosis is an infectious disease caused by the pathogen Toxoplasma gondii and is found worldwide. Toxoplasma gondii is a single-celled parasite that can infect both animals and humans. In most cases, the infection is unnoticed or asymptomatic, especially in people with healthy immune systems. Many infected people don’t realize they’ve had contact with the pathogen.

In fact, up to 50% of the world’s population show antibodies in serological tests indicating a past toxoplasmosis infection. The parasite is widespread worldwide, but it is especially common in regions with warm, humid climates, as well as in areas where close contact with cats or undercooked meat is common.

For healthy adults, an infection is usually harmless or may cause only mild, flu-like symptoms such as swollen lymph nodes or fatigue. However, it’s different for individuals with weakened immune systems, such as those with HIV, after an organ transplantation, or undergoing chemotherapy. In these cases, Toxoplasma gondii can reactivate and lead to serious complications, particularly in the brain or eyes.

Toxoplasmosis is particularly important during pregnancy. If a woman becomes infected with the parasite for the first time during pregnancy, it can be transmitted to the unborn child. The risk and potential harm depend on the timing of the infection. Early infections, that is, those occurring before pregnancy, are usually not a concern because the mother already has protective antibodies.

Although toxoplasmosis often causes no symptoms, it is a significant disease, because it can lead to severe illness in certain situations. Therefore, prevention, education and early detection play a particularly important role, especially in high-risk groups.

Behind the disease toxoplasmosis is a tiny parasite called Toxoplasma gondii.This is what’s known as a protozoan, a single-celled organism that can only reproduce inside living cells. This is why Toxoplasma gondii is referred to as an obligate intracellular pathogen.

The lifecycle of this parasite is complex. The definitive hosts, meaning the organisms where Toxoplasma gondii can reproduce, are exclusively cats and other feline predators. Inside the cat’s intestines, the parasite forms oocysts, which are then excreted in the cat’s feces. These oocysts are highly resistant and can remain infectious in moist soil, sand, or water for weeks to months.

When the oocysts enter an intermediate host, such as humans, rodents, birds, or other mammals, the parasite begins asexual reproduction. It invades the cells of the intestines, spreads through the bloodstream, and can settle in various organs. Toxoplasma gondii most commonly forms tissue cysts in the muscle tissues and the central nervous system. These cysts can remain in the body for life without causing symptoms. However, in such cases, ongoing monitoring of the immune system should be maintained.

In healthy people, this chronic persistence of the parasite is usually symptomless. It typically only becomes problematic when the immune system is weakened, such as in cases of HIV infection, immunosuppressive treatments, or in old age. At that point, the parasite can reactivate and cause serious inflammation in the brain or eyes.

The ability of Toxoplasma gondii to reside in both cats and intermediate hosts, where it can survive for long periods, explains its global distribution. Humans are considered accidental hosts. This means the body contributes to spreading the parasite but plays no direct role in the parasite’s actual reproductive cycle. Nevertheless, the human role remains medically significant, especially regarding pregnancy, immune deficiencies, and chronic inflammatory processes.

Infection with Toxoplasma gondii typically occurs orally, meaning through the mouth. There are several ways the parasite can be transmitted, many of which are often overlooked in daily life.

The most common source of infection is the consumption of undercooked or raw meat, particularly from pigs, lambs, or wild game. These foods can contain tissue cysts, which are small, infectious forms of the parasite that have settled themselves in the muscle tissues of intermediate hosts. If the meat is not cooked to at least 70°C (158°F), the cysts can survive and cause an infection when consumed.

Another significant route of transmission is contact with cat feces. Cats are the only definitive hosts where the parasite reproduces sexually, excreting oocysts in their feces. These oocysts are infectious and can survive for several weeks under suitable environmental conditions. Unintentional ingestion of these oocysts can occur, through unwashed hands or contaminated vegetables, especially during gardening, cleaning cat litter boxes, or playing in sandboxes.

Less commonly, transmission can occur through blood transfusions or organ transplants, particularly in immunocompromised recipients. In these cases, the parasite can become active from latent cysts present in the donated organ.

After infection with Toxoplasma gondii, it typically takes between 3 days and 3 weeks for symptoms to develop. However, the exact timing can vary, depending on factors like the person’s immune system and how they were infected.

In healthy individuals with a normal immune system, toxoplasmosis often goes unnoticed or presents only mild symptoms. In many cases, the body produces antibodies without causing any noticeable discomfort. This is referred to as a “silent” course, which is often only detected through a blood test. When symptoms do appear, they are usually flu-like and may include mild fever, fatigue, headaches or muscle aches, and most commonly, swollen lymph nodes, typically around the neck or throat.

The weaker the immune system, the more likely a severe course of the disease is to develop. Especially in individuals with congenital or acquired immunodeficiency, the parasite can reactivate within a few days or spread unchecked. In such cases, a severe inflammation in the central nervous system often occurs, typically accompanied by neurological symptoms such as headaches, confusion, paralysis, or seizures.

Overall, the speed at which toxoplasmosis spreads varies from person to person. While the infection goes unnoticed in most individuals, it can progress rapidly and severely in certain high-risk groups. This makes early diagnosis and, if necessary, treatment particularly important.

The symptoms of toxoplasmosis can vary widely and depend particularly on whether the affected person’s immune system is weakened. In most healthy people, the infection is mild or completely without symptoms, yet there are typical symptoms that can occur during an active infection.

In individuals with a healthy immune system, toxoplasmosis often resembles a mild flu-like illness. Common symptoms may include:

These symptoms often appear a few days to a few weeks after infection and usually resolve on their own. Sometimes persistent fatigue or swollen lymph nodes may remain.

Particularly in more severe cases, skin rashes, enlarged liver or spleen, or abdominal pain may also occur. However, all these symptoms are not specific to toxoplasmosis and require thorough medical evaluation.

In people with weakened immune systems, toxoplasmosis often takes a significantly more severe course. In these cases, Toxoplasma gondii can spread unchecked throughout the body and particularly affect the central nervous system. As a result, the following symptoms may occur:

Chronic forms of toxoplasmosis, sometimes involving both the nervous system and the eyes, are also possible. The connection between persistent Toxoplasma cysts in the brain and altered neuropsychiatric processes, such as in depression or schizophrenia, is increasingly being explored. However, these connections have not yet been definitively clarified.

While toxoplasmosis infection is usually harmless for healthy adults or even goes unnoticed, there is a special significance during pregnancy. The reason lies in the risk of transmission to the unborn child, which can lead to serious complications, particularly with a first-time infection during pregnancy.

If a woman was already infected with Toxoplasma gondii before pregnancy, there is usually no risk to the child. The body has already formed antibodies that also protect the unborn baby. However, it becomes problematic when the mother comes into contact with the pathogen for the first time during pregnancy. This usually happens through consuming raw meat or contact with cat feces. In these cases, the parasite can cross the placenta and be transmitted to the unborn child. This is then called congenital toxoplasmosis.

The risk of transmission increases as the pregnancy progresses. While it’s relatively low in the first trimester, it can reach up to 60% in the third trimester. However, the severity of potential harm works in the opposite direction: the earlier in pregnancy the infection occurs, the more serious the impact on the child’s development can be.

Possible consequences of fetal toxoplasmosis infection include:

any affected children show no symptoms at birth. However, the disease may only appear weeks or months later, often through vision problems or developmental delays.

For this reason, many countries recommend regular serological screening during pregnancy, especially if no maternal immunity was detected at the initial examination. If an acute infection is identified, specific antibiotic therapy can reduce the risk of transmission and limit potential complications.

A toxoplasmosis infection during pregnancy often causes no symptoms in the mother or only appears as mild, nonspecific symptoms that can easily be overlooked or mistaken for a common infection. This is one of the biggest challenges, because the danger to the unborn child exists even when the mother herself has no symptoms or only very mild ones.

When symptoms do occur, they are usually very nonspecific. Typical symptoms include:

These symptoms often appear within one to three weeks after infection but are usually mild in many cases, which is why they’re often not further investigated. However, even when the pregnant woman seems healthy, the parasite can still be transmitted to the child and cause serious harm.

Therefore, even with minor symptoms during pregnancy, especially if no immunity to Toxoplasma gondii is known, medical evaluation should be sought at an early stage.

Since a toxoplasmosis infection during pregnancy often causes no noticeable symptoms, laboratory testing plays an important role. The most reliable way to detect or rule out an infection is through a blood test that identifies specific antibodies against Toxoplasma gondii.

As part of prenatal care, the first blood test checks for the presence of IgG antibodies. These indicate that the woman has had toxoplasmosis before. In this case, there is usually no danger to the unborn child, as immune protection exists.

However, if IgG antibodies are absent, the woman is considered seronegative, meaning she has not yet come into contact with the pathogen. In this case, a new infection during pregnancy can become dangerous. Therefore, regular follow-up testing is recommended for seronegative pregnant women to detect and treat a fresh infection in time.

If IgM antibodies are detected, this indicates a current or recent infection. In this case, additional tests are usually performed to determine the infection status as precisely as possible. This is important for assessing the risk of harm to the unborn child and initiating treatment if necessary.

The test result is then documented in the maternity record (Mutterpass), so that other healthcare providers and midwives can view the pregnant woman’s immune status at any time.

Since a first-time toxoplasmosis infection during pregnancy can endanger the unborn child, prevention is particularly important, especially for women who don’t have immune protection. The risk of infection in daily life can be significantly reduced with a few simple measures.

Food hygiene is key to preventing toxoplasmosis. Toxoplasma gondii can form cysts in animal tissue, especially in pork, lamb, and game. These cysts are ingested when meat isn’t thoroughly cooked. Therefore, pregnant women should avoid raw or undercooked meat. Raw meat is typically found in dishes like steak tartare, carpaccio, ground pork spread (Mett), or incompletely cooked grilled meat. Processed meats like salami or air-dried ham also carry potential risk.

Equally important is the careful handling of raw fruits and vegetables that may have come into contact with soil or cat litter. Before eating, they should always be thoroughly washed or peeled.

Personal hygiene also plays a central role. Hands should be thoroughly washed after cooking, gardening, or contact with raw meat. Gardening gloves can help avoid direct contact with potentially contaminated soil.

Another risk factor is having contact with cats, as they can excrete infectious oocysts in their feces as definitive hosts. Pregnant women should not clean litter boxes, and if unavoidable, should only do so wearing gloves and with thorough handwashing afterward. Contact with stray cats or kittens should also be avoided as a precaution.

All these measures can help reduce the risk of Toxoplasma gondii infection during pregnancy, without requiring pregnant women to give up a balanced diet or life with pets entirely. Education and conscious hygiene in daily life are the best protection for both mother and child.

In most cases, infection with Toxoplasma gondii is harmless or goes unnoticed. However, there are special disease forms that occur, especially when the immune system is weakened or when the infection affects sensitive organs such as the brain or eye. While these so-called special forms are rarer, they require targeted diagnosis and often specific treatment.

Toxoplasmosis can be particularly dangerous in immunocompromised individuals, such as those with HIV or AIDS, patients who have undergone organ transplants, or those receiving chemotherapy. In these cases, a previously silent infection can reactivate because the immune system is no longer able to control the pathogen. Typically in such cases, toxoplasmic encephalitis occurs which is an inflammation of the brain that can lead to severe neurological damage and even coma.

Ocular toxoplasmosis is another significant special form. It can occur even in people with a healthy immune system and typically causes inflammation in the retina (chorioretinitis).This can permanently impair vision or, in the worst case, lead to blindness if it is not detected and treated as soon as possible.

Another special form involves congenital toxoplasmosis, where the unborn child becomes infected during pregnancy. The consequences can range from mild developmental delays to severe damage to the brain, eyes, and internal organs. In some cases, affected children show no abnormalities at birth but develop symptoms only months or years later.

Ocular toxoplasmosis is the most common parasitic cause of inflammatory retinal disease and represents a serious complication of Toxoplasma gondii infection. It involves chorioretinitis, which is inflammation of the retina and the underlying choroid. This can occur acutely or even many years after a resolved infection.

The disease typically occurs as a reactivation. In these cases, the parasite has established itself in the eye in the form of cysts and becomes active again when the immune system is weakened. While it can affect both people with healthy immune systems and those with weakened immunity, those with immune deficiencies are at a higher risk of more severe symptoms.

Symptoms can appear suddenly and usually affect only one eye:

When inflammation occurs in the macula – the area of sharpest vision – significant vision deterioration can occur. If the inflammation is not treated early, there is also a risk of permanent retinal damage or blindness.

The diagnosis is usually made through an ophthalmological (eye) examination using specialized lenses and funduscopy. This typically reveals an inflammatory lesion with a scarred center. These are usually visible alongside older lesions, which indicates that the infection has been reactivated. Blood tests to detect Toxoplasma antibodies may also be performed to support the diagnosis. 

Treatment typically consists of a combination of therapy with antibiotics and, in cases of severe inflammation, corticosteroids to control the inflammatory process. The goal is to stop the active infection and protect surrounding tissue.

Recurrences of ocular toxoplasmosis are possible. Early detection and targeted treatment are crucial to prevent permanent vision damage.

Cerebral toxoplasmosis is one of the most severe forms of Toxoplasma gondii infection and occurs almost exclusively in patients with a severely weakened immune system. In these cases, the immune system is no longer able to keep the dormant pathogen in tissue under control. Reactivation occurs, allowing the pathogen to spread unchecked, particularly in the brain.

Symptoms often develop rapidly within a few days and can be varied. Common symptoms include:

A typical finding is usually seen in imaging tests. In an MRI or CT scan of the head, multiple ring-shaped lesions are often visible. These are inflammatory foci with central necrosis and edema (swelling), often located in the basal ganglia or cortical substance of the brain. While these ring-enhancing lesions aren’t exclusively characteristic of toxoplasmosis, they’re considered particularly suspicious in immunosuppressed patients.

Cerebral toxoplasmosis is a medical emergency. Direct antiparasitic therapy is crucial to stop the progression of inflammation and prevent permanent neurological damage. Treatment typically consists of pyrimethamine, sulfadiazine, and folinic acid, sometimes supplemented with corticosteroids if brain edema (swelling) is present. Treatment usually lasts several weeks. For HIV patients, initiating or optimizing antiretroviral therapy is also essential.

Untreated, cerebral toxoplasmosis is often fatal. Early detection is therefore all the more important in high-risk patients, especially when new neurological symptoms appear. Primary or secondary prophylaxis is also sometimes recommended in certain high-risk situations to prevent reactivation of the infection.

Congenital toxoplasmosis is an infection that is passed from the mother to the unborn child during pregnancy caused by the parasite Toxoplasma gondii. This almost exclusively happens when the mother is infected for the first time during pregnancy, as her immune system has not yet produced protective antibodies. The parasites can cross the placenta and spread throughout the baby’s developing body, potentially leading to serious health consequences.

The earlier in pregnancy the infection occurs, the greater the risk of severe damage to the baby, even though the risk of transmission is relatively low in the first few weeks. Conversely, the risk of transmission increases significantly in the third trimester, while the severity of symptoms in the baby are usually milder.

Typical clinical signs of severe congenital toxoplasmosis include:

However, this “triad” of symptoms doesn’t appear in all affected infants. Many newborns may seem healthy or only have mild signs at birth. In some cases, the condition might not be noticed until weeks or even months later, when the baby shows signs like developmental delays, hearing or vision issues, or seizures.

If left untreated, congenital toxoplasmosis can lead to permanent disabilities. That’s why early diagnosis, ideally before or shortly after birth, is crucial. The infection can be detected through specific lab tests on the newborn’s blood or cerebrospinal fluid. After birth, medication is often required to prevent reactivation of the infection and reduce potential long-term complications.

The diagnosis of Toxoplasma gondii infection depends on the clinical situation and may require different approaches. In healthy individuals, a simple blood test is often enough. However, for pregnant women, people with weakened immune systems, or if there’s a concern about infection affecting organs, more targeted diagnostic methods are necessary.

The foundation of diagnosis is the serological detection of antibodies in the blood. The first checks are for the presence of IgG antibodies against Toxoplasma gondii. If these antibodies are found, it indicates a past infection and existing immunity. If they are absent, there is a risk of a primary infection, which could be potentially dangerous for the unborn child.

If an acute or recent infection is suspected, doctors will also test for IgM antibodies. These indicate a recent infection, though they can sometimes remain detectable for an extended period. To determine when the infection occurred, an “avidity test” may be performed. This test measures the strength of the IgG antibody binding and helps doctors assess whether the infection is recent or older.

In more complex cases, such as when cerebral toxoplasmosis is suspected, antibody testing alone is not enough. In these situations, imaging techniques are used in addition. In magnetic resonance imaging (MRI) or computed tomography (CT) scans of the head, typical ring-shaped lesions in the brain are often visible. These lesions are a strong indication of an active infection, especially in people with weakened immune systems.

A direct detection of the parasite can be done through a PCR test (Polymerase Chain Reaction). This method identifies the genetic material of Toxoplasma gondii in various body fluids. It can be tested in amniotic fluid (if congenital infection is suspected), cerebrospinal fluid (in cases of brain involvement), or aqueous humor (for ocular toxoplasmosis).

If there is eye involvement, a thorough examination of the retina by an ophthalmologist is also performed. This helps identify inflammatory changes in the retina and choroid, which are typical signs of ocular toxoplasmosis.

Because the symptoms of toxoplasmosis can be quite nonspecific, it’s important to conduct a differential diagnosis to rule out other potential infections or conditions. This includes infections such as cytomegalovirus (CMV), Epstein-Barr virus (EBV), HIV, syphilis, and even tuberculosis.

Treatment for toxoplasmosis is not always necessary, as many infections, especially in healthy individuals with a normal immune system, are mild or go completely unnoticed. However, there are situations where targeted therapy is essential. Treatment is typically recommended for patients with severe symptoms, involvement of sensitive organs, or those who belong to specific risk groups such as pregnant women, newborns, or individuals with weakened immune systems.

The goal of treatment is to stop the parasite from multiplying, prevent it from spreading throughout the body, and thereby reduce the risk of damage to organs such as the brain, eyes, or liver. Toxoplasma gondii appears in the body in different forms: as actively dividing tachyzoites during the acute phase and as dormant tissue cysts in the chronic stage. Treatment primarily targets the active parasites, while the cysts usually cannot be completely eliminated.

Whether treatment is necessary and how it is carried out depends largely on the clinical course, the person’s immune status, and their stage of life. In healthy adults with mild, flu-like symptoms, medication is usually not required, as the infection often resolves on its own. However, treatment becomes essential if toxoplasmosis spreads to the central nervous system or the eyes, if a pregnant woman is infected, or if the unborn child is at risk.

Conventional treatment for toxoplasmosis is based on well-established combination therapies that specifically target the actively replicating forms of the parasite. The standard therapy, particularly for symptomatic infections involving organs, consists of a combination of pyrimethamine, sulfadiazine, and folinic acid (leucovorin). Pyrimethamine and sulfadiazine work by inhibiting the parasite’s cell division, while folinic acid is added to protect the body’s blood cell production from potential side effects of the medications.

This treatment is primarily used for cases affecting the cerebral (brain) and ocular (eyes),  as well as for congenital toxoplasmosis, and must be carried out consistently over several weeks. Depending on the course of the disease, it may be followed by maintenance therapy, especially in patients with weakened immune systems, to help prevent the infection from returning.

For patients who cannot tolerate sulfadiazine, clindamycin is available as an alternative. It can also be given in combination with pyrimethamine and folinic acid. This substitute therapy is particularly useful in cases of allergic reactions or kidney function problems.

In cases of cerebral toxoplasmosis—most commonly seen in HIV-positive individuals with low CD4 counts—intensive and long-term treatment is required. In addition to antiparasitic therapy, corticosteroids may be needed to manage brain swelling caused by inflammatory edema (feet). When the eyes are affected, treatment usually involves systemic therapy with the same medications mentioned above. In some cases, this may be supplemented with local treatments, such as intravitreal drug injections or corticosteroid eye drops, to directly control inflammation within the eye.

Overall, conventional medical treatment for toxoplasmosis depends on individual risk factors, medication tolerance, and the course of the disease. Close medical supervision is essential, especially during prolonged treatment or in more complex cases.

Despite extensive research, there is currently no approved vaccine for toxoplasmosis in humans. This is mainly due to the complex biology of Toxoplasma gondii. Its ability to alter tissues, form cysts, and evade the immune system makes developing an effective vaccine a significant challenge.

The goal of vaccine development is to achieve long-lasting immunity that either prevents a primary infection or significantly reduces the severity of the disease. This would be especially important for certain high-risk groups, such as seronegative pregnant women, where a first-time infection can pose serious risks to the unborn child, or patients with weak immune systems, in whom reactivation of the infection can become life-threatening.

As long as no effective vaccine is available, the best protection remains preventing infection through strict hygiene practices and careful food handling, especially during pregnancy and for individuals with weakened immune systems.

While conventional treatment is essential for symptomatic or severe toxoplasmosis, complementary medicine is increasingly used in chronic or recurrent cases. These approaches can support the immune system and contribute to overall stabilization. It is important to note, however, that complementary methods do not replace antimicrobial therapy, but they can be valuable when used alongside it.

A key approach is phytotherapy. Certain medicinal plants such as garlic, turmeric, ginger, and nasturtium, all contain compounds with antimicrobial and anti-inflammatory properties. They can help stimulate the immune system and support recovery. Bitter herbs also promote liver and digestive function, which can be particularly important when used alongside conventional drug therapies.

In orthomolecular medicine, specific micronutrients are used to help regulate immune processes and counteract oxidative stress. Zinc and selenium play key roles in antiviral and antiparasitic defense. Vitamin C acts as an antioxidant, supports collagen synthesis, and can help reduce inflammation. Vitamin D has immunomodulatory effects, particularly on T-cell activity. Omega-3 fatty acids, found in flaxseed oil or fish, also have anti-inflammatory properties and can positively influence immune system balance.

Traditional Chinese Medicine (TCM) uses methods such as acupuncture to promote the body’s energetic balance and activate self-healing processes. Depending on individual symptoms, such as fatigue, chronic inflammation, or digestive issues, specific points are stimulated that are associated with immune regulation, spleen Qi, or liver function. Herbal TCM formulas can also be customized to the individual but should only be prescribed by experienced practitioners.

Some patients also consider homeopathic remedies, which are usually selected individually. In the context of parasitic infections, remedies such as Cina, Teucrium marum verum, or Sulphur may be used. While their effectiveness remains scientifically debated, some patients report relief from nonspecific symptoms.

Another complementary approach focuses on gut health. A targeted gut rehabilitation, starting with gentle detoxification using bitter herbs, followed by the administration of prebiotics and probiotics. This can help strengthen the intestinal immune system, especially during or after antibiotic therapy. A balanced gut environment provides an important foundation for overall immune function.

All of these approaches should be viewed not as a replacement, but as a complementary addition to conventional medical treatment. In many cases, they can help improve overall well-being, reduce side effects, and support the body’s natural regulatory processes.

In most cases, an infection with Toxoplasma gondii is mild and resolves without lasting consequences. However, in some cases, the parasite can cause permanent damage. This is particularly true for congenital infections, transmitted from mother to child in the womb, or in individuals with chronic or reactivated infections under immunosuppression. Long-term effects most commonly affect the central nervous system and the eyes, as these are tissues where the parasite tends to persist.

In children with congenital toxoplasmosis, neurological deficits can appear during infancy or later in development. These may include epilepsy, delays in motor development, or cognitive impairments. Behavioral changes are also possible and can vary depending on the affected areas of the brain. Often, these effects emerge gradually and become more apparent as the child grows.

Eye damage is also particularly common, often resulting from chorioretinitis, an inflammation of the retina and choroid. This can lead to permanent vision impairment, especially if the central vision area is affected. Even years after the initial infection, reactivation can occur, causing previously inactive lesions to become active again.

In individuals with low immune systems, the parasite can reactivate from its cysts at any time. Such reactivation can trigger severe inflammation in the brain or other organs. Lifelong or preventive therapy may be necessary in these cases to help prevent relapses.

In recent years, potential links between chronic toxoplasmosis and psychiatric disorders, such as depression or schizophrenia, have also been discussed. Studies show a statistical association, although the exact causes are not yet fully understood. It is suspected that inflammatory processes in the brain or changes in neurotransmitter regulation may play a role.

The potential long-term effects highlight the importance of early detection, consistent treatment, and ongoing follow-up—especially for high-risk groups or children infected during pregnancy.

In many cases, infection with Toxoplasma gondii can be avoided by consistently following basic hygiene practices. This is particularly important for high-risk groups such as pregnant women, individuals with weakened immune systems, or young children in close contact. Since the parasite can be transmitted through contaminated food, cat feces, or soil, prevention mainly focuses on avoiding oral exposure to the pathogen.

A key measure is avoiding raw or undercooked meat, especially pork, lamb, and game. Beef can also occasionally contain cysts. Cooking meat thoroughly to an internal temperature above 70 °C reliably destroys the parasites. Alternatively, frozen meat is considered safe, as prolonged freezing also inactivates the cysts.

Fruits, vegetables, and herbs can also be contaminated with oocysts from soil or fertilizers, especially those grown in home gardens. Thorough washing under running water significantly reduces the risk of infection.

Special care should be taken when handling cat feces, as cats, being the definitive hosts, can shed infectious oocysts. Contact with stray cats should also be avoided. It is important to note that only cats that eat raw meat or hunt will shed oocysts; indoor cats fed exclusively on dry or canned food are considered safe.

Gardening is another potential risk, as oocysts can persist in the soil. Wearing gloves and thoroughly washing hands after gardening provides protection. The same precautions apply to contact with sandboxes or soil that may have been frequented by cats.

For pregnant women, it is particularly important to be well informed about how the infection is transmitted. If they do not yet have antibodies against Toxoplasma gondii, regular serological monitoring during pregnancy can be useful to detect a new infection early and take appropriate action.

In the following section, we address the most common questions about toxoplasmosis to provide a clearer understanding of this infection and its potential health effects, particularly in immunocompromised individuals.

The information listed contains relevant topics and serves to improve understanding.