Federal health officials have traced a multistate parasite outbreak to shredded iceberg lettuce served at Taco Bell. The Washington Post reports that the CDC and the FDA have linked the outbreak to the Iceberg lettuce served at five Taco Bell restaurants. The findings suggest the contamination occurred before the lettuce reached Taco Bell restaurants, which had initially come under scrutiny during the early stages of the outbreak investigation.

The report says the lettuce was grown in Mexico, and individuals linked to the investigation have identified Taylor Farm as the supplier to various regional hubs. The parasite responsible for the outbreak, Cyclospora cayetanensis, is difficult to manage because it clings to the rugged surfaces of leafy greens and cannot be easily washed away by normal kitchen procedures.

Taco Bell has now voluntarily removed the affected ingredients from select regional locations as a precautionary measure while clean shipments are actively routed to restaurants. The move comes as officials continue investigating an outbreak that has sickened thousands across several states.

How investigators traced the outbreak to shredded lettuce

The challenge of tracking down a parasite of this nature was that patients usually do not show symptoms for up to two weeks after eating contaminated food. By the time someone experiences the classic signs of severe stomach cramping and explosive diarrhea, they often cannot remember what they ate.

Investigators narrowed the search by conducting detailed food-history tracking. More than 1,644 sick people in this outbreak reported eating at Taco Bell locations in the five affected states, and when investigators cross-referenced their orders, shredded iceberg lettuce emerged as the common ingredient.

Michigan health officials, being the first to suspect specific produce for the outbreak, have reported the highest number of cases. The state health authorities are reporting over 4,300 confirmed infections and more than 100 hospitalizations. Ohio, Indiana, Kentucky, and West Virginia have also reported significant numbers of illnesses linked to the same distribution network.

Taco Bell said it removed the affected lettuce from its supply chain as a precaution. The corporate office released a statement detailing its operational response to the federal findings:

“Based on ongoing conversations with public health officials, and out of an abundance of caution, Taco Bell has taken immediate action to voluntarily remove potentially impacted lettuce from a supplier in select states. The affected ingredient from our supplier is being indefinitely removed from our supply chain nationwide and will be replaced within 24 hours in select states.”

The corporation added: “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. Taco Bell has taken precautionary action, and we encourage all relevant restaurants, retailers, and foodservice operators to do the same.”

While investigators have traced the outbreak to shredded iceberg lettuce, health officials say the investigation remains ongoing. Michigan continues to report the highest number of cases, with hundreds of new infections recorded daily and interviews with more than 1,000 patients pointing to leafy lettuce as the leading suspected source.

Meanwhile, some Taco Bell locations in the Detroit area temporarily stopped serving lettuce, cilantro onion, pico de gallo, and guacamole after notices cited a nationwide recall, according to local media reports.

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