Cyclosporiasis Case Count Tops 7000 as Lettuce Probe Continues

The national cyclosporiasis case count has climbed past 7000, according to news reports citing federal surveillance data.¹ The figure reflects the combined toll of several concurrent Cyclospora outbreaks under investigation this summer, including the multistate cluster reportedly linked to shredded iceberg lettuce distributed by Taylor Farms de Mexico.²

CDC and FDA have not updated case counts specific to the Taco Bell-linked cluster since July 16, when the agencies reported 1644 confirmed illnesses among people who ate at affected locations, with 94 hospitalizations and no deaths. FDA continues investigating whether contaminated lettuce reached food service locations beyond the five states identified so far.

National tally climbs as Taco Bell-linked lettuce probe continues

The jump in the national total illustrates how cyclosporiasis surveillance can lag behind an outbreak’s true scope. CDC has said the actual number of illnesses tied to the Taco Bell cluster is likely higher than the confirmed count, since it can take up to six weeks to link a sick person to an outbreak, and many mild infections resolve without a clinician visit or Cyclospora-specific stool testing. Some states, including Michigan, have reported higher probable-case totals on their own websites, a gap CDC attributes to state tallies counting probable illnesses while its national count reflects only laboratory-confirmed cases.

FDA's traceback investigation continues to point to a single supplier, Taylor Farms de Mexico, as the source of contaminated shredded iceberg lettuce served at Taco Bell locations in Indiana, Kentucky, Michigan, Ohio, and West Virginia. Taylor Farms initiated a voluntary recall of all iceberg lettuce sourced from central Mexico on July 17, and Taco Bell has stopped using product from the implicated supplier. As of July 19, FDA reported no confirmed positive product samples for Cyclospora, after an earlier positive finding on a Taylor Farms sample was reclassified as a false positive.

Cyclospora Transmission, Diagnosis, and Treatment

Cyclospora cayetanensis is a microscopic parasite spread through fecal contamination of food or water, most often linked to fresh produce imported during warm months. Infection causes prolonged watery diarrhea lasting for weeks without treatment, along with fatigue, loss of appetite, bloating, and low-grade fever; fever and vomiting are uncommon. Symptoms typically begin about one week after exposure but can appear anywhere from two days to more than two weeks later, complicating efforts to trace cases back to a single meal or product.

Diagnosis requires stool testing specific to Cyclospora, since routine ova-and-parasite panels do not reliably detect the organism. Confirmed infections are treated with trimethoprim-sulfamethoxazole, and hydration remains central to management for both outpatient and hospitalized patients. CDC continues advising against eating shredded iceberg lettuce from Taco Bell locations in the five affected states and recommends anyone with prolonged or relapsing diarrhea contact a health care provider.

“The problem with bagged lettuce is that it says it's washed, but you cannot right now ensure it is. So buy heads of lettuce if you can. If you're buying lettuce, make sure you wash it well. If you're going to eat lettuce at a restaurant or at a gathering, it's important to ask about how it was prepared, or to avoid it when you're not sure how the preparation went,” Catherine O’Neal, MD, chief academic officer for the Franciscan Missionaries of Our Lady Health System, previously told Contagion.³

The Taco Bell-linked cluster is one of several cyclosporiasis outbreaks CDC is tracking this summer, consistent with the disease’s typical seasonal rise. This year’s national case count is running notably higher than in recent seasons, according to news reports citing federal data.⁴

References

1. Centers for Disease Control and Prevention. Investigation update: Cyclospora outbreak, July 2026. Updated July 16, 2026. Accessed July 21, 2026. https://www.cdc.gov/cyclosporiasis/outbreaks/07-26/investigation.html

2. US Food and Drug Administration. Investigation of 5-state outbreak of Cyclospora illnesses: iceberg lettuce (July 2026). Updated July 19, 2026. Accessed July 21, 2026. https://www.fda.gov/food/outbreaks-foodborne-illness/investigation-5-state-outbreak-cyclospora-illnesses-iceberg-lettuce-july-2026

3. O’Neal C. The latest on the cyclosporiasis outbreak: an FDA false positive test, and what treatment looks like. ContagionLive. Published July 20, 2026. Accessed July 21, 2026. https://www.contagionlive.com/view/the-latest-on-the-cyclosporiasis-outbreak-recalled-products-and-what-treatment-looks-like

4. Sun LH. Can I eat lettuce now? What to know about the cyclosporiasis outbreak. Washington Post. Published July 21, 2026. Accessed July 21, 2026. https://www.washingtonpost.com/health/2026/07/21/can-i-eat-lettuce-now-what-know-about-cyclosporiasis-outbreak/