Federal health officials have identified lettuce from Mexico served by Taco Bell locations across five U.S. states as a source of the widespread outbreak of diarrhea-causing parasite cyclospora. The Centers for Disease Control and Prevention late Thursday confirmed the source and warned consumers not to eat shredded iceberg lettuce from Taco Bell restaurants in Indiana, Kentucky, Michigan, Ohio and West Virginia. Officials have identified a single supplier of the lettuce. The federal warnings to consumers did not identify the company, but Taylor Fresh Foods, of Salinas, California, said FDA testing indicated it was "a specific independent farm" affiliated with the company.