Hundreds of Americans have fallen ill from a parasitic infection that causes severe, watery diarrhea, and federal health authorities still cannot identify a common source. Cyclosporiasis cases have surged across at least 18 states since May, with Michigan alone reporting more than 170 infections as of July 1, more than triple the state's entire 2025 total.
The CDC, FDA, and state health departments say they are investigating. But the agency's own surveillance data lags by weeks, its latest national count is already outdated, and a recent rollback in foodborne illness monitoring has left the government with fewer tools to catch exactly this kind of outbreak.
For families heading into the Fourth of July weekend, loading coolers with fresh produce and firing up grills, the timing could hardly be worse. And the federal response so far amounts to a shrug: we're looking into it, check back next month.
CDC surveillance data current through June 16 counted 145 people across 17 states who contracted cyclosporiasis after eating food in the United States. Twenty of those patients were hospitalized. No deaths had been reported among that group. An additional 45 cases were linked to travel abroad and tracked separately.
Patients ranged in age from 5 to 86, with a median age of 42. The infections spanned Alaska, Colorado, Connecticut, Florida, Georgia, Illinois, Louisiana, Massachusetts, Michigan, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas, Virginia, and Wisconsin.
Those numbers, however, are already stale. The CDC updates its cyclosporiasis dashboard only once a month. By the time the agency told USA TODAY on July 2 that it had no new data to share, Michigan's caseload alone had already eclipsed the national figure from two weeks earlier.
The Michigan Department of Health and Human Services reported more than 170 cyclosporiasis cases as of July 1, a staggering jump from the roughly 50 cases the state logged in all of 2025. The first case in the current cluster was discovered June 22, meaning the bulk of those infections piled up in barely nine days.
No specific food product, supplier, or distributor has been publicly linked to the Michigan cluster. The state health department has previously noted that contaminated produce is a common vehicle for the parasite, and past U.S. outbreaks have been traced to basil, raspberries, and lettuce.
Federal investigators from the FDA are working alongside the CDC and state authorities to find a common thread. So far, they have not found one.
On June 2, the CDC issued a statement to USA TODAY that read more like a legal disclaimer than a public health warning:
"CDC has no evidence of a single, multistate Cyclospora outbreak linking cases happening right now and being reported in press."
The agency added that its published numbers represent "a surveillance count of cases across the United States of people with cyclosporiasis," including both clusters under FDA investigation and cases "that have not been linked to a common source."
Read that again. The CDC is not saying there is no outbreak. It is saying it has no evidence of a single, connected outbreak, a distinction that does little to reassure the 170-plus patients in Michigan or the families in 17 other states who spent a week or more dealing with severe gastrointestinal illness.
A month later, on July 2, the agency's update was even less informative: it simply told the newspaper it had nothing new to share. The dashboard refreshes monthly. Patience, apparently, is the prescription.
Cyclospora cayetanensis is a microscopic parasite more commonly associated with tropical and subtropical regions in Central America, South America, and Africa. It spreads through the fecal-oral route, typically via contaminated produce or water, and occasionally through contaminated surfaces.
Symptoms usually appear about a week after exposure, though the incubation window ranges from two days to two weeks. The hallmark is watery diarrhea, sometimes described as severe or, in clinical shorthand, "explosive." Other symptoms can accompany the intestinal distress, and the illness can linger for weeks without treatment.
The CDC designates May through August as cyclosporiasis season in the United States, coinciding with warmer weather and peak consumption of fresh fruits and vegetables. That seasonal pattern makes the current surge notable but not unprecedented, what stands out is the speed and scale of the Michigan cluster and the breadth of states reporting cases this early in the season.
The federal government's ability to track exactly this kind of outbreak took a significant hit just days before Michigan's caseload surged. On July 1, the CDC's FoodNet surveillance program scaled back the number of pathogens it actively monitors from eight to just two, salmonella and Shiga toxin-producing E. coli.
Cyclospora is one of the six pathogens dropped from required active surveillance. So are listeria, campylobacter, shigella, vibrio, and yersinia. The FoodNet program covers roughly 54 million people across 10 states, about 16 percent of the U.S. population.
Barbara Kowalcyk, director of the Institute for Food Safety and Nutrition Security at George Washington University, warned about the consequences of the rollback in blunt terms:
"A lot of the work that I and many, many, many, many other people have put into improving food safety over the past 20 or 30 years is just going away."
The timing is hard to ignore. The government is tracking fewer foodborne pathogens at the very moment a parasitic illness is spreading across nearly 20 states. Whether the surveillance reduction directly affected the speed of the current response is an open question. But it is the kind of question that answers itself when the next outbreak hits and the data pipeline is thinner than it used to be.
The cyclosporiasis surge is not happening in isolation. The country has been dealing with a string of foodborne illness outbreaks in recent months. A drug-resistant Salmonella outbreak tied to backyard chickens spread to 42 states, producing significant hospitalizations. Separately, a baby formula recall at major retailers followed an infant botulism outbreak across three states.
Each incident on its own is a manageable public health event. Taken together, they paint a picture of a food safety infrastructure under strain, fewer surveillance tools, slower data updates, and investigations that seem to trail the illness rather than get ahead of it.
The CDC says it is working with the FDA and state agencies. The FDA says clusters are under investigation. State health departments are issuing updates. But nobody has identified the contaminated food, the supplier, or the distribution chain responsible for sickening hundreds of people across the country.
Health authorities and the Cleveland Clinic recommend thorough washing of fresh produce before consumption. The parasite is not killed by standard surface disinfectants, and it cannot be reliably removed by rinsing alone, though washing reduces risk. Avoiding untreated water and practicing careful food hygiene, especially with imported fruits and vegetables, remain the primary defenses.
None of that is new advice. It is the same guidance the CDC issues every summer. The difference this year is that federal health authorities are navigating these outbreaks with reduced monitoring capacity and a surveillance dashboard that updates less frequently than most Americans check their email.
Several basic facts remain unknown. No one has publicly identified which food product or products are responsible for the current wave. It is unclear how many of Michigan's 170-plus patients required hospitalization. The relationship between the Michigan cluster and the broader national caseload has not been explained, whether they share a source or represent separate, unrelated contamination events.
The CDC's next dashboard update will presumably arrive sometime in July, reflecting data through mid-to-late June at best. By then, the summer produce season will be well underway, and the window for catching a contaminated product before it reaches millions of holiday tables may have already closed.
Meanwhile, food safety scares continue to pile up across the country, and the public is left to do what it always does when the bureaucracy moves at its own pace: wash the lettuce, hope for the best, and wonder who exactly is minding the store.
When the government cuts the tools it needs to find contaminated food and then tells the public it has "no new data to provide," the system is not working. It is just keeping score, slowly, and after the damage is done.
