North Carolina Reports 718 Cyclosporiasis Cases Since May; State Says Source Is Still Unconfirmed

718 Cases, and Still No Answer

North Carolina health officials reported 718 cases of cyclosporiasis across the state as of Tuesday, July 28, 2026. The count covers everyone diagnosed since May 1^[1][4]. In the single week before that update, 157 new cases were added — a jump of about 28%^[1][4].

Eight more people were hospitalized in that same week. That brought the hospitalization total to 24, a 50% rise in seven days^[4]. The North Carolina Department of Health and Human Services, known as NCDHHS, says it still has not confirmed what food made people sick^[1][2].

Cyclosporiasis is caused by a microscopic parasite called Cyclospora cayetanensis. It usually spreads through contaminated fresh produce or water, not from person to person^[2][3]. Symptoms typically start about a week after exposure and can include severe, drawn-out diarrhea. Antibiotics can treat it, and cooking food to 165 degrees Fahrenheit kills the parasite. Washing produce lowers the risk but does not remove it entirely^[1][2].

Wake County, home to Raleigh, has the largest share of cases in the state. It had 366 of the 561 cases counted as of July 20 — well over half the statewide total in one county^[17].

A Common Meal, Not a Confirmed Cause

When NCDHHS interviews sick patients about what they ate, two foods come up more than any other: parsley and cilantro^[2][7]. That fact alone has driven a lot of the public conversation about the outbreak.

But the state has been careful to say what that finding does not mean. A commonly reported food does not prove it's the source, NCDHHS says. Many sick people report eating neither herb^[2][7].

Dr. Carl Williams of the state's Division of Public Health has said there are likely several different sources feeding the outbreak at once. He's also pointed out a simpler problem: people often don't know they ate the ingredient in question. Someone might remember eating pico de gallo but forget the cilantro mixed into it^[2][7].

NCDHHS has also said its outbreak is separate from a different, national cluster. Federal investigators tied that one to shredded iceberg lettuce served at Taco Bell restaurants in the Midwest. The two are not believed to be connected^[1][5][6].

Why the Trail Goes Cold

The parasite behind this outbreak is unusually good at covering its own tracks, and that's not an accusation against any investigator — it's basic biology. Cyclospora needs days to weeks sitting outside the human body, usually in soil or water, before it becomes able to infect anyone^[7]. That means the contamination almost always happens on a farm, not in a restaurant kitchen.

Then symptoms take about another week to show up after someone eats the contaminated food^[2]. Add the time it takes to see a doctor, get tested, and have the case reported to the state, and a single case can surface two to four weeks after the meal that caused it. By then, whatever herb or vegetable carried the parasite is long gone, eaten or thrown away.

That delay is also why patient interviews are such a weak tool, even though they're the main one investigators have. Parsley and cilantro show up often in interviews with sick people — but they also show up constantly in healthy people's diets, tucked into salsa, salad mixes, and garnishes. A food only becomes real evidence when sick people report eating it noticeably more often than healthy people do. That distinction is why NCDHHS can say "parsley and cilantro" and "source unconfirmed" in the same breath without contradicting itself^[2].

There's a detection wrinkle here too. Most cases are found because commercial labs, such as Quest and LabCorp, run the test and report positive results to the state electronically^[7]. That means the case count partly reflects how many people happened to see a doctor and get the right test ordered — not just how much illness is actually out there. Some of North Carolina's rising numbers could reflect sharper detection rather than a bigger outbreak, and there's no way to separate the two just by looking at the count^[7].

A Different Outbreak, and a Retracted Test

While North Carolina searches for its own source, federal investigators have already closed the loop on a separate case. The CDC identified shredded iceberg lettuce from Taylor Farms de México, served at Taco Bell locations in Michigan, Ohio, and other states, as the source of a distinct multistate cyclospora outbreak^[5][6].

Taylor Farms responded on July 17, 2026 by pulling all iceberg lettuce sourced from central Mexico off the U.S. market. It later suspended production at its central Mexico facility and brought in outside experts to review its food-safety systems^[14][6]. HHS Secretary Robert J. Kennedy Jr. pointed to that response as evidence the outbreak was "under control," since a source had been named and recalls carried out^[9].

That claim got more complicated when the FDA said a Taylor Farms lettuce sample that had tested positive for cyclospora was in fact a false positive^[8][19]. The agency has said it's still standing behind its traceback to the same supplier, arguing that the pattern of who got sick and what they ate is itself a form of evidence, even without a confirmed lab result^[19].

Federal agencies are currently running at least four separate cyclospora investigations this summer, including one tied to a still-unspecified product^[6]. The North Carolina outbreak isn't among the ones with a named supplier — it remains open.

What the Missing Answer Is Supposed to Mean

The genuine dispute in this story isn't over the numbers. Nobody disagrees that 718 people got sick, or that 24 were hospitalized^[1][4]. The disagreement is over what an unsolved outbreak reveals about the country's ability to catch these things at all.

Consumer groups and many public health researchers point to real cuts in federal capacity. Since 2025, the CDC has lost more than 2,800 staff, roughly a quarter of the agency, including what's been reported as a more than 70% reduction in the team that tracks parasitic diseases like cyclospora^[10][22]. FDA food-facility inspections have also dropped sharply, from 10,641 in 2011 to roughly 4,500 a decade later — well below what Congress required^[22][21].

A narrower, more specific change adds to that argument. Cyclosporiasis has been a nationally notifiable disease since 1997, meaning states are required to report every case to the CDC in a standard way — and that baseline requirement never went away^[18]. What did change: in July 2025, the CDC dropped cyclospora from the mandatory pathogen list tracked by FoodNet, a smaller active-surveillance network covering just 10 U.S. sites. FoodNet cross-checks cases more closely than routine reporting, and it's often what lets investigators recognize scattered illnesses in different states as one connected outbreak. The cut shrank FoodNet's mandatory list from eight pathogens to two — Salmonella and E. coli — dropping cyclospora along with five other pathogens^[18][7]. Critics argue that losing that closer layer of tracking, even without touching the basic reporting rule, is exactly how a slow-moving outbreak like this one can go unrecognized longer than it should^[10][21].

Federal officials and the produce industry see the same delay differently. They argue it's simply normal for this particular parasite, given how long it takes to become infectious and how little physical evidence it leaves behind by the time anyone gets sick^[6][12][14]. HHS leadership has promised to overhaul the food system and rebuild trust in the CDC, which raises the stakes of any finding that staffing cuts contributed to a slower response — but no official investigation has yet tied North Carolina's specific delay to those cuts^[11][10].

Whose Evidence Counts

Mexico's government and its produce industry have pushed back hard against the broader cloud hanging over the country's lettuce exports, even though North Carolina's outbreak has not been linked to Mexico at all. Mexico's health ministry says its own testing of lettuce and water samples at the Taylor Farms plant came back negative for cyclospora, and that "no evidence has been found" the national outbreak started there^[12]. A Mexican farm-analysis director called it notable that no lettuce sample has tested positive, and that Mexico itself saw few confirmed illnesses^[12].

That negative-test argument has its limits. A clean lab result on lettuce tested weeks after harvest doesn't prove much either way, since the produce in question is long gone and perishable evidence degrades fast. Critics of the Mexican industry's framing say a negative test is being treated as proof of innocence when it's really just the ordinary limit of testing food that no longer exists by the time anyone looks for it^[12].

The stakes for getting this right are large on both sides of the border. Mexico produces about 550,000 tons of lettuce a year, and roughly half of it is exported, almost entirely to the United States, where it makes up about four-fifths of imported lettuce. Central Guanajuato state alone grows about 28% of that crop^[12][13]. Some U.S. retailers and restaurants have already started refusing produce from that region outright, a decision that hits growers no investigation has actually named^[13].

Back in North Carolina, none of that resolves the original question. NCDHHS says its investigation continues with local, state, and federal partners, and that a public dashboard is now being updated weekly^[1][25]. Until a specific source turns up, or enough time passes without one, the state's most consistent message is the least satisfying: there are probably several sources at once, and the people who got sick may never be sure exactly which meal did it^[2][7].