T. cruzi is a single-celled parasite responsible for causing Chagas disease, primarily found in parts of Central and South America. It is transmitted to humans through the bite of infected triatomine bugs, also known as kissing bugs. The parasite can also be spread through contaminated food, blood transfusions, or from mother to child during pregnancy. Once inside the human body, T. cruzi can invade various tissues, particularly the heart and digestive system. Symptoms of Chagas disease can range from mild to severe, including fever, fatigue, and swelling. If left untreated, the disease can lead to serious health complications over time, such as heart disease and digestive disorders.