While investigations are ongoing, health officials suspect shredded lettuce may be partly responsible for the current outbreak.

Michigan appears to be the epicenter of the outbreak, but so far more than 30 states have also reported infections in the last two weeks.

Cyclosporiasis outbreak: Health officials are probing Taco Bell in Detroit due to a nationwide recall of certain ingredients, including lettuce and guacamole.

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.