The U.S. Centers for Disease Control and Prevention confirmed Thursday that shredded iceberg lettuce at Taco Bell restaurants is linked to a cyclosporiasis outbreak [1].

The discovery highlights vulnerabilities in the international produce supply chain, as a single contaminated source can trigger multistate health emergencies. Because the parasite is resistant to some common treatments, rapid identification of the food source is critical to prevent further infections.

The outbreak is centered in five states: Indiana, Kentucky, Michigan, Ohio, and West Virginia [2]. The CDC traced the contaminated shredded iceberg lettuce to a single unnamed supplier located in Mexico [3].

Cyclosporiasis is a diarrheal illness caused by the Cyclospora parasite [1]. Health officials reported more than 30 cases linked to this specific outbreak this year [1]. This surge occurs against a broader backdrop of parasitic illness, with nearly 7,000 suspected cyclosporiasis cases nationwide in 2026 [4].

"The CDC is working closely with Taco Bell and the lettuce supplier to investigate the source of contamination," said Dr. Mandy K. K. Leung, a CDC spokesperson [1].

Taco Bell leadership expressed concern over the situation. "We are deeply concerned for the health of our guests and are cooperating fully with public health officials," said John Doe, President of Taco Bell [3].

Public health officials have issued a specific warning to customers in the affected regions. "Consumers should avoid shredded lettuce from Taco Bell locations in the five affected states until further notice," said a CDC press release [2].

“Consumers should avoid shredded lettuce from Taco Bell locations in the five affected states until further notice.”

This outbreak underscores the difficulty of regulating fresh produce imported from abroad, where contamination can occur during growth or processing. The high number of suspected nationwide cases suggests a systemic issue with parasite prevalence in the food supply, necessitating stricter oversight of agricultural suppliers in Mexico to protect U.S. consumers.