Taco Bell has been the shining star of the fast-food business for several years. But now the company is contending with a restaurant’s worst nightmare: an explosive diarrhea outbreak.

State and federal investigators are probing the fast-food chain’s possible connection to cyclosporiasis

Taco Bell has removed several fresh ingredients, such as lettuce, from its menus at locations across the country, including in Texas and Michigan.

Nearly 7,000 cases of cyclosporiasis have been reported across the country