Domestic Cyclospora Outbreak Surges Past 4,000 Cases as Investigation Focuses on Taylor Farms and New Unspecified Source Outbreak
The summer 2026 outbreak of the foodborne parasite Cyclospora cayetanensis has escalated into the largest recorded cyclosporiasis outbreak in U.S. history. On July 24, 2026, the Centers for Disease Control and Prevention (CDC) expanded its investigation to nine states, adding Illinois, Indiana, Kansas, Oklahoma, and Pennsylvania to the initial five affected states (including Ohio, Michigan, Kentucky, and West Virginia).
Massive Surge in Case Counts
As of late July 2026, the CDC has confirmed 1,947 laboratory-confirmed cases specifically linked to this primary outbreak, resulting in at least 98 hospitalizations. Nationally, the overall cyclosporiasis case count is approaching 7,000 cases across 41 states this season, demonstrating an unusually severe parasitic season that far exceeds historical baselines.
- The Primary Suspect: Epidemiological and traceback data strongly link the primary outbreak to contaminated shredded iceberg lettuce supplied by Taylor Farms de Mexico and served at Taco Bell locations.
- Voluntary Recall and Facility Shutdown: On July 17, 2026, Taylor Farms voluntarily recalled all iceberg lettuce sourced from central Mexico and distributed to restaurants, food service providers, and retailers across 27 states. A company spokesperson confirmed that Taylor Farms has temporarily shut down and suspended all production at its central Mexico facility out of an abundance of caution.
- The False Positive Twist: On July 18, 2026, the FDA reported that a sample of Taylor Farms lettuce had tested positive for Cyclospora. However, on July 19–20, 2026, the FDA reclassified that result as a false positive after a laboratory re-review. Despite the lack of a confirmed positive product test, federal health officials maintain that epidemiological traceback data remains robust enough to keep Taylor Farms lettuce as the primary suspect.
Second Separate Outbreak Under Investigation
Compounding the public health crisis, the FDA announced on July 22, 2026, that it is investigating a second, separate Cyclospora outbreak involving 72 people. Unlike the primary Taylor Farms outbreak, investigators have not yet identified any food vehicle or agricultural source for this second cluster.
The CDC's Health Alert Network (HAN) continues to advise clinicians to specifically request diagnostic testing for Cyclospora (which requires special stool tests) when patients present with prolonged, watery diarrhea, as the parasite is not detected by standard parasite screening panels.
"The nation’s largest multistate outbreak of cyclosporiasis linked to shredded iceberg lettuce has expanded to nine states, the Centers for Disease Control and Prevention said Friday... In its July 24 investigation update, CDC reported 1,947 laboratory-confirmed infections linked to the multistate outbreak, with at least 98 hospitalizations and no deaths." — CDC says massive cyclospora outbreak is now in nine states