Federal health officials identified shredded lettuce from Mexico served at Taco Bell locations in five Midwest states (Indiana, Kentucky, Michigan, Ohio, West Virginia) as the likely source of a cyclosporiasis outbreak affecting thousands. Cyclospora is a parasite that causes acute diarrhea and gastrointestinal illness; the CDC has advised people in affected states not to eat Taco Bell lettuce and Taco Bell has stopped using the supplier. The outbreak has sickened people across 31 states total, making this a significant food safety event requiring immediate action from consumers in the five most-affected states.