Toxoplasmosis is an infection that is dangerous to unborn children. The infection is spread through a parasite that can be found in undercooked meat from an infected animal or in cat feces. Symptoms of infection don't always appear but may include aching, fatigue, swollen lymph nodes, and fever. A blood test can diagnosis toxoplasmosis. Toxoplasmosis can be treated during pregnancy if a pregnant woman becomes infected. Follow the links below to find WebMD's comprehensive coverage about how toxoplasmosis is caused and transmitted, how to treat it, and much more.