Health officials have identified lettuce from Mexico served at Taco Bell locations across five U.S. states as a source of the outbreak of diarrhea-causing parasite cyclospora.

Michigan, which is where much of the outbreak is centered, has reported over 4,300 cases of cyclosporiasis, which can cause diarrhea and a low grade fever.

Shredded iceberg lettuce supplied by Taylor Farms and sold at some Taco Bell restaurants has been linked to a multistate outbreak of cyclosporiasis, a source familiar with the…