Toxoplasmosis is a disease caused by the protozoan parasite Toxoplasma gondii, one of the world’s most common parasites. Infection usually occurs by eating undercooked contaminated meat, exposure from infected cat feces, or mother-to-child transmission during pregnancy. The disease can cause flu-like symptoms but in general, infected people are asymptomatic. Infants born to infected mothers and for people with weakened immune systems, toxoplasmosis can cause serious complications.