The recent rise in Cyclospora infections across the United States has officials hunting for a common source as summer brings a familiar spike in cases. Health agencies are tracing clusters, warning about a parasite that can cause prolonged, disruptive gastrointestinal illness, and urging anyone with symptoms to seek testing and treatment.
Federal health authorities reported 145 confirmed cases of cyclosporiasis across 17 states as of mid-June 2026, and all infections were acquired domestically. The parasite behind the illness is Cyclospora, a tiny organism that contaminates food or water and can be hard to spot or eliminate without proper controls.
The illness has a distinct profile: watery, often “explosive” diarrhea that can linger for weeks or months if it goes untreated. Patients commonly suffer severe abdominal cramping, bloating, nausea, fatigue and noticeable weight loss, making everyday life difficult until a diagnosis is made.
Outbreaks tend to concentrate in warmer months, with the official season running from May 1 through Aug. 31, when conditions help the parasite persist and spread. Cases this season have been reported from Texas to Alaska, with New York showing the highest numbers so far, followed by Texas and Illinois.
Not every infection resolves on its own; many people need specific antibiotic treatment to clear the parasite and ease symptoms. Of the 145 confirmed patients, 20 required hospitalization, though there have been no deaths reported to date; affected individuals range in age from 5 to 86, with a median age of 42, and women make up 61 percent of cases.
Investigations are underway at federal and state levels, with the CDC working alongside the Food and Drug Administration and local health departments to track down sources and link cases. “There is currently no evidence of a single, multistate Cyclospora outbreak linking all cases,” the CDC noted in its surveillance report, a reminder that multiple, unrelated exposures can happen at once.
Because Cyclospora is transmitted through ingestion of contaminated produce or water, prevention focuses on safe handling, thorough washing of fresh foods when possible, and careful monitoring of supply chains. Health officials advise anyone experiencing symptoms consistent with cyclosporiasis to contact a healthcare provider for testing and treatment promptly, since timely therapy can prevent prolonged illness and complications.
