4,173 Cases and Climbing: Inside America's Worst Cyclosporiasis Year

More than eleven thousand five hundred Americans have been sickened by a parasite most of them had probably never heard of before this summer, and the count keeps climbing. The Centers for Disease Control and Prevention confirmed 4,173 laboratory-confirmed cases of cyclosporiasis reported since May 1, 2026 — the largest such outbreak the United States has ever recorded — with an estimated 7,500 additional unconfirmed or probable cases on top of that, according to CDC data and Good Morning America reporting. ⁵⁷⁹

At least 308 people have been hospitalized. Cases have been tallied in 41 states, and the hardest-hit among them is Michigan, where Food Safety News put the state total at 7,171 after an overnight jump of roughly 600 patients as of July 24. ⁷⁸⁹ Sources do not agree on the geographic spread: ABC News and the CDC cite 41 states ⁷⁹, while the HeyDay video referenced 34 states. Both numbers come from the CDC's running tally, which has moved quickly enough that midweek snapshots disagree.

On Tuesday, July 21, 2026, Health and Human Services Secretary Robert F. Kennedy Jr. told reporters that the cyclosporiasis outbreak was "under control." ⁶¹⁰ He said epidemiological investigators had traced the source of the outbreak and that a voluntary recall was already in motion. ¹¹ By the next day, the case count had surged past 11,500. ⁷⁹

Kennedy has pushed back against criticism of the federal response, arguing that surveillance cuts targeted only redundant work and do not account for the record numbers. ¹¹ The political backdrop matters here. Last July, the CDC made cyclosporiasis reporting optional effective July 1, 2025 — only Salmonella and E. coli remain mandatory reportable pathogens. Critics in both parties have noted that the timing of an investigation into the worst outbreak on record coincides with the agency that tracks it no longer being required to count it.

The suspected vector is iceberg lettuce from a Taylor Farms facility in central Mexico. Taylor Farms issued a voluntary recall covering shipments to 27 states. ⁴⁸ The FDA initially reported a positive Cyclospora test on Taylor Farms lettuce and called it a breakthrough. Then on July 19, 2026, the agency retracted that finding — it was a false positive. ³ Newsweek noted that Kennedy's declaration of control came "just a day before" the FDA retraction. ³ USA Today and NBC News have stressed that the link between the outbreak and any specific source remains unconfirmed. ⁴⁶

Mexico has rejected responsibility, saying its own investigation has not produced evidence linking the outbreak to the Taylor Farms facility. ⁶⁴ That puts the United States and its largest produce supplier at odds over a parasite that is invisible to the naked eye and notoriously hard to trace.