US investigators traced a parasite outbreak to shredded iceberg lettuce supplied to Taco Bell restaurants, according to the US Centers for Disease Control (CDC).
The CDC has identified 1,645 people in five states linked to the Taco Bell outbreak so far.
Health officials identified a single supplier of iceberg lettuce from Mexico as the likely source of the contamination. The supplier distributed lettuce to Taco Bell locations in Indiana, Kentucky, Michigan, Ohio and West Virginia.
Taco Bell, on its part, said it had removed the lettuce from its restaurants.
Authorities did not initially name the supplier, but Taylor Farms later said testing by health officials pointed to "a specific independent farm” that is associated with the company.
