WASHINGTON — The Centers for Disease Control and Prevention announced Friday that public health officials have linked the ongoing outbreak of cyclosporiasis in five states to shredded iceberg lettuce from Taco Bell restaurants.

The fast food chain wrote in a statement that it plans to remove the “potentially impacted lettuce” from its “supply chain nationwide and will be replaced within 24 hours in select states.”

“While no official advisory has been issued, we believe public health is a shared responsibility among restaurants, their suppliers, and authorities, and we are proud to have consistently acted quickly and proactively to protect our guests,” the statement said. “Taco Bell has taken precautionary action, and we encourage all relevant restaurants, retailers, and foodservice operators to do the same.”

The CDC statement said it had linked the ongoing outbreak to Taco Bell restaurants in Indiana, Kentucky, Michigan, Ohio and West Virginia. The statement didn’t say whether the lettuce was the cause of the severe gastrointestinal illness caused by a parasite in other states. 

Since the outbreak began, the CDC has confirmed more than 1,600 cases in 34 states. Nearly 150 of those people were hospitalized, though no deaths have been reported so far. 

The CDC writes on a webpage about the outbreak that it expects the number of confirmed cases will continue to increase given the six-week “reporting lag between illness onset and case reporting to CDC.”