Taco Bell Lettuce Linked to Multistate Cyclosporiasis Parasite Outbreak

The FDA’s traceback investigation has identified a single supplier of iceberg lettuce from Mexico used by the affected Taco Bell locations. Taco Bell is currently working to stop using this lettuce, and the FDA is working with the supplier to determine if the contaminated produce was sent elsewhere.

Outbreak Scope and Impact

The outbreak is centered heavily in the Midwest, with Michigan reporting 4,312 confirmed cases and 102 hospitalizations as of a recent Thursday report. Ohio reported 372 cases on July 9. In Allegheny County, cases rose to 11 in 2026, up from three cases the previous week.

While the Taco Bell link accounts for over 1,644 cases, the broader national picture of cyclosporiasis is more extensive. The CDC previously reported 1,645 laboratory-confirmed domestic cases and was investigating an additional 5,100 reports across 34 states. Some estimates suggest the total number of confirmed and suspected cases could reach 7,000, though this may be an underestimate due to scaled-back tracking systems and the fact that many people may not be tested.

For more on this story, see Taylor Farms Lettuce Identified as Potential Source of Taco Bell Outbreak.

The CDC noted that it is also investigating other national outbreaks of cyclosporiasis that are unrelated to the Taco Bell incident.

Understanding Cyclosporiasis

Cyclosporiasis is a gastrointestinal disease caused by Cyclospora cayetanensis, a microscopic parasite transmitted through human feces. It infects the small intestine and is typically acquired by eating fresh produce contaminated with the parasite.

The parasite is uniquely difficult to track for several reasons:

This follows our earlier report, Cyclosporiasis Outbreak Hits 34 States With Nearly 7,000 Reported Cases.

• Incubation Period: Symptoms typically appear about one week after exposure, but can range from two days to two weeks or more. This makes it difficult for patients to recall every item of produce consumed.
• Environmental Delay: The parasite requires one to two weeks in the environment after being excreted before it becomes infectious.

Symptoms and Medical Guidance

The most common symptom is watery diarrhea, which the CDC describes as sometimes “explosive.” Other symptoms include:

• Abdominal cramping, bloating, and increased gas
• Nausea and vomiting
• Fatigue and loss of appetite
• Weight loss and low-grade fever

The illness is not typically fatal, and the CDC has reported zero deaths linked to this outbreak.

Read also: Cyclosporiasis Outbreak Hits 1,600 U.S. Cases as Officials Probe Water Source.

Doctors and the CDC advise that routine stool tests do not always screen for this parasite; patients may need to specifically request a test for Cyclospora.

Prevention and Safety Measures

Public health officials advise consumers to avoid eating shredded iceberg lettuce from Taco Bell locations in Indiana, Kentucky, Michigan, Ohio, and West Virginia.

To reduce the risk of infection, the CDC recommends washing hands and fresh produce thoroughly under running water.

From a systemic perspective, the FDA notes that standard chlorination or chemical disinfection is ineffective against the parasite. Effective reduction of C. cayetanensis populations may require UV treatments, ozone, or microfiltration.