The Brief The CDC says the cyclospora outbreak linked to iceberg lettuce has expanded to 15 states. The cyclospora outbreak linked specifically to iceberg lettuce has now expanded to 15 states, the Centers for Disease Control and Prevention shared Wednesday. Here are the 15 states with cyclospora cases linked to iceberg lettuce:Dig deeper:Investigators initially narrowed in on lettuce served at Taco Bell. Federal officials subsequently said they are focused on Taylor Farms as the source of the lettuce in the outbreak, and the company has recalled iceberg lettuce grown in central Mexico. FILE - A detailed close-up shot of several fresh iceberg lettuce leaves.