Toxoplasma gondii is a single-celled parasite that can infect many warm-blooded animals, including humans. It is commonly found in cats, which are the primary hosts. The parasite can be transmitted through contaminated food, water, or soil, as well as through contact with cat feces. In humans, infection with Toxoplasma gondii often causes mild flu-like symptoms or may be asymptomatic. However, it can pose serious risks for pregnant women and individuals with weakened immune systems, potentially leading to complications such as birth defects or severe illness.