A multistate Cyclospora outbreak had produced 1,645 confirmed cases of cyclosporiasis across 34 states by mid-July, the CDC said in a Health Alert Network notice issued on July 14, 2026. The agency reported 141 hospitalizations and no deaths, with more than 5,100 additional reported cases still awaiting verification.
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What investigators know so far
Cyclospora cayetanensis is a microscopic intestinal parasite spread through food or water contaminated with fecal matter; it does not pass directly from person to person. Infection causes watery diarrhea, stomach cramps, bloating, fatigue, and low-grade fever that can last weeks without treatment, and relapse is common. The FDA and CDC have been investigating fresh produce as a possible source, and the FDA's outbreak investigation has examined iceberg lettuce among suspected vehicles; a definitive source had not been confirmed in the advisories posted through late July.
Confirmed counts rise when state laboratories finish testing: the CDC's notice stressed that the verified total represented a fraction of reported illnesses, since confirmation requires specialized stool testing that many clinical laboratories do not run routinely.
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What this outbreak investigation can and cannot show
The parasite's incubation period, typically about a week after eating contaminated food, complicates traceback work, because people often cannot recall a specific meal from that long ago. State and local health departments continue to interview cases and collect stool samples as part of the joint investigation.
Case counts and hospitalizations describe the scale of illness, but attribution to a specific product evolves as epidemiological, traceback, and laboratory evidence converge. Early associations can shift, and absence of a confirmed source does not mean produce is safe in general or that a particular item caused every case.
When to talk to a clinician
People with prolonged watery diarrhea should seek care, mentioning what they ate in the preceding weeks. Cyclosporiasis is treatable with specific antibiotics, but routine over-the-counter remedies do not clear the parasite, and diagnosis requires a targeted test.