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Understanding Toxoplasmosis: Symptoms, Causes, Diagnosis, Treatment, and Prevention

Alan Lucks | MD

Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on December 5th, 2023.

Key Takeaways

  • The parasite Toxoplasma gondii infects approximately 60 million Americans, with most people never knowing they have it since healthy immune systems keep it dormant in tissue cysts.

  • Pregnant women face the highest risk—maternal infection can cause miscarriage, stillbirth, or congenital defects including blindness and intellectual disability in 10-15% of infected babies.

  • Cat litter boxes become infectious 1-5 days after contamination, while undercooked lamb, pork, and venison pose greater transmission risk than properly handled cat waste.

  • Blood tests measuring IgG and IgM antibodies can distinguish between recent infection (requiring treatment during pregnancy) and past exposure (which provides protective immunity).

  • Standard treatment combines sulfadiazine, pyrimethamine, and leucovorin (folinic acid) for 4-6 weeks, though healthy adults typically need no medication as symptoms resolve within weeks to months.

Toxoplasmosis is a parasitic infection caused by the parasite Toxoplasma gondii. This parasite can be found in the intestines of some animals, such as cats and pigs. When infected, the parasite can form cysts in various parts of the body, including the brain, muscles, and heart. While most healthy individuals may not experience any symptoms, toxoplasmosis can be harmful to people with weakened immune systems and unborn babies.

Symptoms of Toxoplasmosis

The symptoms of toxoplasmosis can vary depending on the individual's age and overall health. In babies, toxoplasmosis can cause serious complications, such as:

  • Seizures

  • Enlarged liver or spleen

  • Jaundice (yellowing of skin and eyes)

  • Severe eye infections

In older children and adults, toxoplasmosis symptoms may resemble those of the flu, including:

  • Headaches

  • Body aches

  • Fever

  • Fatigue

Causes and Risk Factors

Toxoplasmosis is caused by exposure to the Toxoplasma gondii parasite. You may come into contact with the parasite through various means, such as:

  • Cleaning a cat's litter box or touching infected cat feces

  • Consuming contaminated water or undercooked meat

  • Using utensils contaminated by raw meat

  • Eating unwashed fruits or vegetables

Individuals with weakened immune systems, such as those with HIV or undergoing chemotherapy, are at a higher risk of developing severe toxoplasmosis symptoms.

Understanding Toxoplasmosis: Symptoms, Causes, Diagnosis, Treatment, and Prevention

Diagnosing Toxoplasmosis

If you suspect that you have toxoplasmosis, consult your doctor. They may perform a blood test to check for antibodies produced by your body to fight the infection. In some cases, additional tests like an MRI or brain biopsy may be necessary to check for cysts or lesions in the brain.

For pregnant women, doctors may recommend an ultrasound or amniocentesis to determine if the infection has passed to the baby.

Treating Toxoplasmosis

Treatment for toxoplasmosis depends on the individual's health status. Most healthy people do not require treatment. However, for those with weakened immune systems, doctors may prescribe antibiotics like sulfadiazine and pyrimethamine.

Pregnant women may be given spiramycin to prevent the infection from passing to the baby. If the baby is already infected, sulfadiazine and pyrimethamine may be recommended after the 16th week of pregnancy.

Preventing Toxoplasmosis

To reduce your risk of toxoplasmosis, follow these prevention tips:

  • Wear gloves and wash your hands thoroughly after outdoor activities or gardening

  • Cook food thoroughly and wash fruits and vegetables before consuming

  • Avoid drinking untreated water and unpasteurized milk products

  • Keep your cat indoors and feed them only dry or canned cat food

  • Clean the litter box daily, wearing gloves and washing hands afterward

For more information on toxoplasmosis, visit these reputable sources:

The Bottom Line

Most healthy adults experience mild flu-like symptoms that resolve without treatment, but pregnant women and immunocompromised individuals require immediate medical evaluation and potential antibiotic therapy. Simple precautions like cooking meat to 160°F and having someone else handle cat litter during pregnancy provide excellent protection. If you're pregnant or immunocompromised and experiencing persistent flu-like symptoms, Doctronic can help you determine if testing is needed.

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