Parasites & Mental Health Toxoplasmosis & Mental Health: What You Need to Know Toxoplasmosis is an infection caused by the parasite Toxoplasma gondii . It’s commonly transmitted through exposure to cat feces, contaminated soil, or consuming raw or undercooked meat. In many healthy individuals, the infection causes mild or even unnoticed symptoms, but it can pose more serious risks for pregnant women and those with weakened immune systems. Common Physical Symptoms of Toxoplasm