Skip to content About 100,000 people in the United States are thought to be infected with Trypanosoma cruzi, the parasite that causes Chagas’ disease, a potentially life-threatening illness that primarily impacts the cardiac and digestive system. Up to 20 million people are believed to be infected in Mexico, Central and South America. Miller-Keystone Blood Center tests each first time blood donor for Chagas’ disease and discards any positive units.
