So how does an individual contract Toxoplasmosis? A Toxoplasmosis infection is caused by ingesting the Toxoplasma gondi parasite. Most cat owners are infected with the parasite by accidentally ingesting infected cat feces. This happens when a person touches their mouth after handling a cat litter box, working in a garden or sand box or touching anything that has come in contact with cat feces(3). https://petsaw.com/best-cat-litter-boxes/