Toxoplasmosis is an infection caused by the parasite Toxoplasma gondii. Although many people may have toxoplasma infection, very few have symptoms. This is because the immune system usually keeps the parasite from causing illness. But babies who become infected before birth can be born with serious mental or physical problems.
Toxoplasmosis often causes flulike symptoms, swollen lymph glands, or muscle aches and pains that last for a few days to several weeks. Pregnant people can be tested to see if they have an antibody to the illness. Fetal testing may include ultrasound and testing of amniotic fluid or cord blood. Treatment may include antibiotics.