Across the United States, an unprecedented, mysterious outbreak of cyclosporiasis — an intestinal illness caused by the cyclospora parasite marked by debilitating explosive diarrhea — has reached historic proportions, infecting thousands of people and sowing widespread anxiety in hard-hit communities.
For many Americans, a sudden case of diarrhea seems like a minor, passing inconvenience. That was the initial assumption of Nick Palmiter, a 29-year-old resident of Monroe County, Michigan, when he first developed symptoms in early July. But what began as a mild discomfort quickly escalated into a weeks-long battle with unrelenting stomach cramps and frequent bathroom trips. As days stretched on, Palmiter told reporters he found himself using the bathroom 15 to 20 times a day, describing a constant sensation of pressure and bubbling in his abdomen that felt “almost like you have a balloon in your stomach”. After persistent urging from a coworker, he sought care at an urgent care clinic, where providers immediately sent him to the emergency room. That is where Palmiter received his diagnosis: cyclosporiasis, a parasite-borne illness that has now spread to every corner of the U.S., with more than 4,173 confirmed cases across 41 states — marking the largest recorded outbreak of the disease in U.S. history.
Michigan has recorded more cases than any other state, topping 7,000 total, with Monroe County — a rural community of roughly 154,000 along the state’s eastern border — facing one of the highest infection rates in the region. Local data confirms 286 confirmed cases in the county alone, and the outbreak has sent ripples of fear through the tight-knit community. Palmiter described the local mood as one of pervasive anxiety, a sentiment echoed by his mother, Michelle Palmiter. She has watched neighbors and family members take extreme precautions to avoid infection: her own niece threw out all fresh produce in her refrigerator, including a perfectly good watermelon, rather than risk exposure. Social media discussion boards for Monroe County residents are filled with similar accounts, including one mother who wrote her toddler has survived exclusively on chicken nuggets and crackers since the outbreak began. Michelle still consumes produce, but only after cooking it thoroughly, and has stopped eating at restaurants entirely. She said much of the public panic stems from widespread distrust of the inconsistent and delayed government response to the crisis. “We’re not trusting anything they’re putting out about it,” she explained.
Public health officials first detected the unusual cluster of infections on May 13, according to the U.S. Food and Drug Administration (FDA). But in the months since, cases have continued to climb, and the ultimate source of the parasite remains a public health mystery. Restaurants and major national retailers including Walmart, Jack in the Box, and Taco Bell have pulled fresh produce, most commonly iceberg lettuce, from shelves “out of an abundance of caution”, but no definitive source has been confirmed. FDA investigators have pointed to major U.S. food supplier Taylor Farms as a potential origin point, and the company voluntarily recalled all of its central Mexico-grown iceberg lettuce out of precaution. An apparent breakthrough came in early July, when the FDA announced a test sample of Taylor Farms iceberg lettuce returned a positive result for cyclospora. But less than 24 hours later, the agency retracted the announcement, confirming the result was a false positive.
Francisco Diez-Gonzalez, director of the Center for Food Safety at the University of Georgia College of Agricultural and Environmental Sciences, explained that detecting the cyclospora parasite is inherently an extraordinary challenge. Two main factors complicate investigators’ work: first, the parasite’s genetic makeup makes it difficult to sequence and identify reliably. Second, cyclospora symptoms can take up to several weeks to appear after infection, meaning investigators struggle to trace an infected person’s food consumption back to a single common contaminated source. “Finding a few cysts of cyclospora in a lettuce sample is literally like looking for a needle in a haystack,” Diez-Gonzalez said. He added that while false positive results are not uncommon in laboratory testing, it is unusual for unconfirmed results to be released to the public. Typically, test findings go through multiple rounds of validation before being announced, to avoid the kind of confusion that has marked this outbreak. “Whether they had sufficient evidence to actually go public, that’s what is questionable,” he noted. The inconsistent communication, he added, erodes public trust in health authorities, leaving consumers confused about what is safe to eat. The FDA did not respond to requests for comment from media outlets ahead of publication.
The disconnect between official statements and case counts deepened in mid-July, when Health Secretary Robert F. Kennedy Jr. publicly stated that cyclosporiasis was “under control” — the same day the U.S. Centers for Disease Control and Prevention (CDC) released its highest case tally to date, reporting 4,173 confirmed cases and an additional 7,400 suspected cases still under investigation. Most of the new cases were reported in Ohio and Michigan.
For local residents like Brian Clare, a 52-year-old grain and beef farmer in Monroe County, the outbreak has upended daily life. Though Clare has never received an official diagnosis, he developed classic cyclospora symptoms after eating store-bought raspberries, a produce item linked to possible contamination, and he knows at least five other local residents with matching symptoms. For more than three weeks, he has dealt with severe stomach cramps and repeated nightly trips to the bathroom. “This is the most painful thing I’ve ever been through in my life,” he said. To cope while working his fields, Clare keeps rolls of toilet paper with him on his tractor, and has to stop mid-work to relieve himself in open fields when the urge hits — which can come on in less than two minutes with no warning. Like many local farmers, he has not sought formal medical care, saying he cannot afford the time off work, and that most small-scale farmers lack adequate health insurance to cover doctor visits. The outbreak has changed his habits permanently: he now always washes produce before eating it, a step he never bothered with before, and says he will never buy store-bought raspberries again. “It’s been that miserable,” he said.