Thousands of sick people didn’t eat at Taco Bell, and investigators are racing to discover where else the contaminated lettuce was sent.

The cyclosporiasis outbreak has sickened thousands of people nationwide, and Michigan has been the hardest hit.

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

Upwards of 1,600 people who contracted cyclosporiasis reported eating at the chain beforehand, the CDC and FDA said.