A widespread outbreak of the Cyclospora parasite, which causes "explosive" watery diarrhea, has reached 34 U.S. states. A primary multi-state cluster is linked to contaminated shredded lettuce served at Taco Bell locations across five specific states. [1, 2]https://www.today.com/health/disease/cyclospora-map-states-parasite-outbreak-diarrhea-2026-rcna38583

Cases acquired in the U.S.

This map shows where the 1,645 people with cyclosporiasis acquired in the United States since May 1, 2026, lived. Cyclosporiasis cases may not be limited to these states with known cases. The true number of people sick with cyclosporiasis was likely higher than the number reported. This is because some people recover without medical care and are not tested for Cyclospora.

https://www.cdc.gov/cyclosporiasis/php/surveillance/index.html