Federal investigators have added six states to the Cyclospora outbreak linked to recalled iceberg lettuce, widening a case count that had been confined to nine states a week earlier. The CDC outbreak page now lists 15 states, 6,358 cases, 278 hospitalizations and two deaths, both in Michigan.
The newly added states are Arkansas, Iowa, Missouri, Nebraska, New Hampshire and North Carolina. They join Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Oklahoma, Pennsylvania and West Virginia. Missouri alone has reported 1,095 cases, according to state figures cited by NBC News in its report on the expansion, roughly double what the state reported the week before.
For shoppers, the expansion is less alarming than it sounds, and the reason matters. Cyclospora has an incubation period of up to two weeks, the implicated product was recalled on July 17, and its use-by dates have since passed. New states appearing on the list now generally reflect illnesses that already happened and are only being confirmed, not fresh exposures in grocery aisles this week.
Surveillance Lag Explains Most of the Growth
The distinction between new illness and newly counted illness is the central fact of this outbreak. Stephen Ostroff, a former acting FDA commissioner, told NBC News that with an incubation period up to two weeks, there should no longer be people newly getting sick from that product, but that it takes time for patients to seek care, get tested, be diagnosed, be reported to a state health department and then be reported to CDC.
Ostroff also flagged the open question. Because the recalled lettuce carried use-by dates that ended Aug. 3, illnesses in people exposed after that point would point somewhere else. We may have solved the Taylor Farms shredded lettuce piece, but that's unlikely to explain everything we're seeing, he said.
CDC's own data support the lag argument rather than a fresh wave. Outbreak-associated illnesses began June 22, and onset dates have continued through July 31, and the agency estimates roughly six weeks between illness onset and a case reaching its national count. That pipeline is why the federal picture and the state pictures rarely match on any given day.
It is also why two different numbers are circulating. The 6,358 figure describes the lettuce-linked outbreak specifically. National cyclosporiasis surveillance is broader: for May 1 through Aug. 3, CDC counted 10,468 laboratory-confirmed domestically acquired cases across 47 states, with 517 hospitalizations and two deaths, plus more than 12,255 additional reports that are not laboratory confirmed or still require investigation. CDC has been explicit that it is also investigating other cyclosporiasis illnesses nationally that come from other sources and are unrelated to the lettuce outbreak, and it moved to weekly surveillance updates for 2026 because case counts have run far above last year.
The Recalled Product Should Already Be Gone
On July 17, Taylor Farms de Mexico recalled all iceberg lettuce sourced from central Mexico. The recall covered product distributed and sold in at least 27 states to consumers, restaurants, and retailers, including Taco Bell locations and Marketside brand items at select Walmart stores. The Taylor Fresh Foods recall notice lists the affected products.
CDC notes that the best-by dates on the recalled items have passed and the products should no longer be available in stores or restaurants. Anyone who still has recalled lettuce at home should throw it out or return it, and wash any surfaces or containers it touched using hot soapy water or a dishwasher.
The agency also cautions that Cyclospora can be spread by many types of fresh produce, so ordinary produce hygiene still applies. Washing alone cannot guarantee removal. Cooking produce to at least 158 degrees kills the parasite.
Prolonged Diarrhea Is the Symptom That Should Prompt a Test
Cyclosporiasis is not a 24-hour stomach bug, and that is the most useful thing for a family to understand. Symptoms typically begin about a week after infection, though the range runs from two days to two weeks or more. The hallmark is watery diarrhea, along with loss of appetite, weight loss, cramping, bloating, increased gas, nausea, and fatigue. Without treatment, symptoms can last from a few days to a month or longer and can come and go.
The parasite does not spread from person to person, which is why investigators look for a shared food rather than tracing household contacts.
CDC also warns that routine stool tests do not always screen for Cyclospora, and patients may need to specifically request testing. That single detail explains a large share of the delayed diagnoses in this outbreak. Anyone with prolonged or recurring watery diarrhea since late May should raise Cyclospora directly with a clinician.
Dehydration is the main danger, and it is most serious for young children, older adults, and people who are immunocompromised, including patients in cancer treatment or after a transplant. Severe dehydration, an inability to keep fluids down, or symptoms that worsen rapidly warrant urgent evaluation.
Michigan Remains the Center of the National Picture
Michigan continues to carry the heaviest burden. The state health department dashboard has reported 12,218 cyclosporiasis cases and 193 hospitalizations, against a typical year in which the state records roughly 50 cases. MedicalDaily previously reported on Michigan's first two confirmed deaths in the outbreak and the lag between state and federal counts. The state health department has said both deaths involved people with significant underlying health conditions that may have been affected by cyclosporiasis and dehydration, and that death from cyclosporiasis is uncommon in the United States.
Cost and access are worth flagging for households. Cyclosporiasis is treated with the sulfa-based antibiotic combination trimethoprim-sulfamethoxazole, and patients with sulfa allergies need an alternative regimen chosen in consultation with a clinician. Because diagnosis often requires a specific test request and sometimes repeat stool samples, patients without a regular provider may face more visits and more out-of-pocket costs than a typical gastrointestinal illness would generate. Local health departments can direct residents to lower-cost testing options.
CDC defines the US cyclosporiasis season as May 1 through Aug. 31, and it expects reported counts to keep rising as delayed reports arrive. The investigation remains open, additional states could be added, and federal officials have not ruled out other contributing sources. MedicalDaily will continue tracking the state and federal counts as they are updated.
Frequently Asked Questions
Which six states were added? Arkansas, Iowa, Missouri, Nebraska, New Hampshire, and North Carolina.
Does adding states mean the outbreak is still spreading? Not necessarily. The recalled lettuce came off the market in mid-July, and its use-by dates have passed, and the incubation period tops out around two weeks, so most newly listed cases are older illnesses now being confirmed.
Why do CDC's numbers differ from my state's numbers? CDC reports only laboratory-confirmed cases and estimates a six-week reporting lag, while states may include probable cases and update more often. Both can be accurate at the same time.
Is the recalled lettuce still in stores? CDC says the best-by dates have passed and the product should no longer be available. Check your refrigerator anyway and discard anything recalled.
How is cyclosporiasis treated? With prescription antibiotics. Untreated illness can last weeks and can relapse, which is why diagnosis matters.
Can I catch it from a sick family member? No. Cyclospora spreads through contaminated food or water, not person to person.
When should I go to the emergency room? Signs of severe dehydration, inability to keep fluids down, or rapidly worsening illness require urgent care, especially in young children and older adults.
