Federal surveillance has recorded 13,895 laboratory-confirmed cyclosporiasis infections acquired in the United States since May 1, according to the CDC's cyclosporiasis surveillance page. In the same stretch last year, the count was 1,180. At least 10,455 additional infections may require further investigation.
A more-than-tenfold jump raises an obvious question, and it is the right one to ask before drawing conclusions from any outbreak number. Are more Americans being exposed to contaminated food, or are investigators simply finding more of what was always there?
The honest answer is that both forces are at work, that they cannot be cleanly separated with the data available, and that one system built to help separate them was scaled back last year. For a household, that matters less as a policy dispute than as a limit on what any case count can tell you about your own risk.
Detection and Contamination Both Push in the Same Direction
Several things genuinely inflate case counts without any change in the amount of contaminated food circulating.
Awareness is the largest. Cyclospora is not detected by routine stool tests, and a clinician must order a specific test to identify it. Once an outbreak makes news, doctors order that test far more often, and infections that would have been dismissed as a stomach bug become counted cases. Multiplex gastrointestinal panels, which screen for multiple pathogens at once and are now common, detect parasites that older single-target tests would have missed.
Working the other direction, undercounting is severe and constant. Food Safety News has reported that for every confirmed patient, many go undiagnosed, by as many as 83 to one. Reporting lags compound it. Symptoms take one to two weeks to appear; people delay seeking care; and laboratory backlogs this summer added weeks to the wait, so cases logged in August often describe illnesses that began in June.
So the reported figure is simultaneously inflated by better-looking cases and deflated by people who were never tested. Those two distortions do not cancel out in any measurable way.
But the detection explanation cannot account for the whole increase this year. Investigators traced a specific contaminated product, iceberg lettuce from a single central Mexico operation, and that outbreak alone accounts for 9,481 illnesses across 17 states. Two people died, and 398 were hospitalized. Better testing does not manufacture hospitalizations. A tenfold rise driven substantially by one identified contamination event is a contamination story with a detection component, not the reverse.
The Measurement System That Would Answer This
There is a specific tool designed to measure foodborne illness consistently over time, and its coverage of this parasite has been reduced.
FoodNet, the Foodborne Diseases Active Surveillance Network, conducts active surveillance at fixed sites, meaning staff contact laboratories rather than waiting for reports to arrive. It links the CDC, FDA, USDA, and ten state health departments, and its staff regularly contact more than 700 laboratories to identify cases. Because the sites and methods remain constant, year-over-year comparisons are meaningful. Passive reporting, where the count depends on whether clinicians and states happen to report, cannot distinguish a real increase from an increase in attention.
In a letter to the acting commissioner of the FDA, Senator Richard Blumenthal wrote that cuts reduced FoodNet's monitoring mandate "from eight pathogens to just two", cutting Cyclospora monitoring and requiring reliance on passive reporting from state health departments. The change took effect on July 1, 2025. A separate congressional letter on FoodNet describes the same reduction, notes that surveillance for Cyclospora and five other pathogens became optional, and points to related actions including the termination of pandemic-era grants to state and local health departments in March 2025 and the disbanding of the CDC division that housed federal expertise on parasitic diseases.
Those characterizations come from members of Congress conducting oversight, not from a court or an agency finding, and the administration has not agreed with the framing. MedicalDaily has reported on the Warren inquiry and the federal response to the outbreak.
An important qualification goes along with all of that. Several surveillance specialists have pushed back on that framing, noting that FoodNet is designed to estimate the burden of foodborne illness rather than to detect outbreaks. Outbreak detection runs through nationally notifiable disease reporting and laboratory networks, which were not changed, and cyclosporiasis remains a nationally notifiable condition. What is not in dispute is the underlying structure: active surveillance produces comparable numbers across years, and passive reporting does not.
Michigan's chief medical executive made a related point from the state side, telling CIDRAP News that "No single state can lead an effort like this" without national data consolidation, and that it would have been helpful to know what other states were seeing early on.
The Part That Actually Affects a Grocery Run
None of this changes the individual calculation much, and saying so plainly is more useful than either reassurance or alarm.
Even in a record year, the absolute risk to any one person from fresh produce remains low, and the nutritional cost of avoiding fruits and vegetables is real and immediate. The evidence supports paying attention to active recalls rather than withdrawing from the produce aisle.
What surveillance gaps do change is the speed of a warning. A weaker counting system means a contaminated product may circulate longer before anyone notices a pattern, shifting risk to whoever eats it during that window. That is a public health system question, not a shopping question, and it is why the food safety conversation this summer has moved toward inspection and traceability rather than toward consumer behavior.
The practical steps remain ordinary. Check the FDA recall page rather than relying on memory of a headline. Refrigerate cut produce and use it by the package date. Keep produce separate from raw meat. And if prolonged or relapsing diarrhea has gone unexplained since late spring, ask a clinician specifically about Cyclospora testing, because that request is what converts an uncounted illness into both a treatment and a data point.
Higher-risk groups, including older adults, pregnant people, young children, and immunocompromised patients, have more reason to follow recall notices closely.
Two developments would sharpen the picture. FDA's inspection of the implicated Mexican facility could establish how contamination occurred, and any restoration of active Cyclospora surveillance would make next year's numbers comparable to this year's. Neither has been resolved. MedicalDaily will report the inspection findings and any changes to federal surveillance coverage.
Key Questions Answered
How much have cases risen? CDC has recorded 13,895 laboratory-confirmed cases of cyclosporiasis acquired in the United States since May 1, compared with 1,180 in the same period last year, with thousands more awaiting investigation.
Is that more illness or more testing? Both contribute. Awareness and multiplex testing panels find infections that were previously missed, but a single traced contamination event accounts for 9,481 illnesses, two deaths, and 398 hospitalizations.
Why is this hard to answer definitively? The system designed for year-over-year comparison, FoodNet, had its Cyclospora coverage reduced in 2025, according to congressional oversight letters, shifting reliance to passive state reporting.
Did surveillance cuts cause the outbreak? Surveillance specialists have pushed back on that claim, noting that FoodNet estimates the illness burden rather than detecting outbreaks, and that cyclosporiasis remains nationally notifiable.
Are reported numbers too high or too low? Both distortions exist. Attention inflates counts while missed diagnoses deflate them. Food Safety News has reported that up to 83 cases can go undiagnosed for every confirmed one.
Should people stop buying fresh produce? No. Absolute individual risk remains low, and the nutritional cost of avoidance is real. Follow active recalls instead.
What would settle the question? Restoring active surveillance for this parasite would make future counts comparable, and the FDA inspection of the implicated facility could establish how contamination occurred.
