Toxoplasma gondii is an intracellular parasitic protozoa that causes Toxoplasmosis. Infection is typically caused by eating contaminated undercooked meat, coming into contact with infected cat feces, or mother-to-child transmission during pregnancy. Most people with the disease have no symptoms, but it can cause serious complications in infants born to infected mothers and immunocompromised people. Toxo Gondii – IgG tests for the presence of IgG antibodies against Toxoplasma gondii and determines whether an individual has previously been infected with the disease. The absence of IgG antibodies before or early in pregnancy identifies women at risk of infection, while the presence of IgG identifies immunocompromised patients at risk of reactivation of a latent infection.