Michigan health officials confirmed on Monday that two people have died after becoming ill with cyclosporiasis, the first deaths reported in connection with a parasite outbreak that has produced more than 18,000 confirmed and suspected illnesses across the United States since the start of May.
The Michigan Department of Health and Human Services said medical records show both individuals had significant underlying health conditions that may have been affected by cyclosporiasis and dehydration. The department said no additional information about the two cases will be released.
An FDA spokesperson said both people became ill before the Taylor Farms de Mexico recall of iceberg lettuce sourced from central Mexico.
The disclosure changes the risk picture in a specific way. Until Monday, federal and state agencies had described cyclosporiasis as an illness that is unpleasant and persistent but rarely dangerous. MDHHS has not withdrawn that characterization; it noted alongside the announcement that death from cyclosporiasis is uncommon in the United States. What has changed is that the outbreak is now large enough, and has reached enough medically vulnerable people, that a rare outcome has occurred twice in one state.
The First Fatalities in a Record Season
Michigan has reported 11,234 cyclosporiasis cases since its outbreak investigation period began in early May, according to the state dashboard. Of those patients, 193 had been hospitalized as of the most recent weekly update. In a typical year, the state records roughly 50 cases, meaning the current total is more than 200 times its usual annual burden. Wayne County has reported the most cases, and adults in their thirties account for the largest share.
The national picture is also without precedent. CDC surveillance shows 6,707 laboratory-confirmed, domestically acquired cases since May 1, plus more than 11,500 additional cases that are not yet laboratory confirmed or that require further investigation, many of them from Michigan and Ohio. Cases have been reported in 45 states. The agency has counted 423 hospitalizations among laboratory-confirmed patients and, as of that update, no deaths.
The worst previous year on record was 2019, when roughly 4,700 confirmed and suspected illnesses were reported nationally; the laboratory-confirmed domestic count that year was 2,408. By either measure, this season has already surpassed it.
Federal investigators have linked a nine-state cluster — Illinois, Indiana, Kansas, Kentucky, Michigan, Ohio, Oklahoma, Pennsylvania and West Virginia — to shredded iceberg lettuce from a single supplier served at Taco Bell locations. That cluster accounts for at least 1,947 laboratory-confirmed illnesses and at least 98 hospitalizations. Taco Bell said it completed removal of the affected lettuce from its restaurants, and Taylor Farms recalled all iceberg lettuce sourced from central Mexico the same day, later suspending sourcing from the region for the rest of the growing season.
One caveat belongs with that finding. The FDA's traceback converged on a single supplier, but the agency has not reported a confirmed positive product sample, and an earlier reported positive test was retracted. The FDA is also investigating at least five additional cyclosporiasis outbreaks whose sources have not been identified.
Federal and State Counts Are Not Telling the Same Story
Readers checking official numbers this week will find two different answers, and the discrepancy is worth understanding rather than dismissing.
The CDC's laboratory-confirmed table does not reflect any deaths, and its national case total sits well below the combined figures reported by states. That is a function of reporting mechanics rather than disagreement. The agency counts only laboratory-confirmed cases with international travel ruled out and publishes weekly; it has said confirmation can take as long as six weeks. State dashboards include probable cases and update far more frequently.
For anyone tracking this outbreak in August, the practical implication is that state health department pages are the more current source and the federal figure is the more conservative one. Michigan updates case counts each weekday morning and posts hospitalization and detailed outbreak data on Thursdays.
Officials have flagged a second limitation. Dr. Natasha Bagdasarian, Michigan's chief medical executive, told NBC News that some health systems have restricted testing to patients who are severely ill or immunocompromised, because of laboratory backlogs and supply limits. She said that makes it harder to judge whether the apparent slowdown is real, and that she does not know whether a single product recall explains it. Counts that fall partly because fewer people are tested are not the same as an outbreak ending. The state has also reported that a batch of roughly 475 cases added in late July reflected delayed laboratory processing rather than new illness.
Michigan has seen two distinct waves of illness, one in late June and one in early July. Barbara Kowalcyk, who directs the Institute for Food Safety and Nutrition Security at George Washington University, has attributed that pattern to contaminated product arriving in two separate batches, and has noted that ongoing contamination of irrigation or processing water would keep an outbreak going.
Dehydration, Not the Parasite Itself, Is the Immediate Danger
Cyclospora cayetanensis is a microscopic parasite spread through food or water contaminated with feces. It does not pass directly from person to person. The most common symptom is frequent, sometimes explosive watery diarrhea, along with loss of appetite, weight loss, bloating, nausea, and fatigue. Symptoms usually begin about a week after exposure, with a range of roughly two days to two weeks.
Cyclosporiasis is treated with the antibiotic combination trimethoprim-sulfamethoxazole, and symptoms often improve within days of starting treatment. Many otherwise healthy people recover without treatment, though untreated symptoms can appear to clear and then return repeatedly over weeks.
The mechanism behind the two deaths appears to involve fluid loss rather than the infection itself. Severe, prolonged diarrhea and vomiting can produce dangerous dehydration, which is far more consequential for people whose kidneys, hearts or immune systems are already compromised. That is the group guidance points to most directly: older adults, people receiving cancer treatment or taking immunosuppressive drugs, people with chronic kidney or cardiovascular disease, and infants.
Neither MDHHS nor the CDC has released case-fatality figures, and neither has revised its assessment that cyclosporiasis is not typically life-threatening. Both statements can be true at once. A rare outcome becomes visible when the denominator grows into the tens of thousands.
Steps for Households Still Buying Summer Produce
Recalled Taylor Farms iceberg lettuce should be discarded or returned. Beyond that specific product, no single item explains the majority of cases, which means prevention advice remains general.
MDHHS has advised buying whole heads of lettuce rather than prewashed bagged lettuce or salad mixes, discarding the outer two to three layers of leaves, and washing the inner leaves under running water. For greens that can be cooked, cooking is the safest option. Rinsing reduces risk but does not eliminate it, and the CDC has warned that chemically disinfecting or sanitizing produce may not fully eliminate the parasite. Handwashing before food preparation remains standard guidance.
If a household member has watery diarrhea lasting more than a few days, asking a clinician for cyclospora testing is worth doing, because the parasite is not detected unless testing for it is ordered. Signs that warrant prompt medical evaluation include very little urine output, dizziness on standing, confusion, an inability to keep fluids down, or bloody stools. Anyone who is pregnant, immunocompromised, or caring for an older adult should seek guidance sooner rather than later. Local health departments can direct uninsured patients toward lower-cost testing. This article is general information and not a diagnosis.
Cases of cyclosporiasis typically rise from the start of May through the end of August, according to the CDC. The agency updates national surveillance weekly.
The newest confirmed fact is that two Michigan residents with significant underlying conditions have died in connection with this outbreak. Those most affected are medically vulnerable adults in the hardest-hit states. The most reasonable action is treating persistent watery diarrhea as something worth a phone call rather than something to wait out. The central uncertainty is whether the recalled lettuce explains the full outbreak or whether other contaminated products remain in circulation.
Frequently Asked Questions
What exactly did Michigan announce? MDHHS confirmed two deaths connected to the state's cyclosporiasis outbreak. Medical records show both people had significant underlying health conditions that may have been affected by cyclosporiasis and dehydration. No further identifying details are being released.
Are these the first cyclosporiasis deaths in the United States? They are the first deaths reported in connection with this outbreak, and officials describe deaths from cyclosporiasis in the US as uncommon. The CDC's laboratory-confirmed surveillance table had not been updated to reflect them as of its most recent weekly posting.
How many people have been infected? Michigan reports 11,234 cases, with 193 hospitalizations as of the latest weekly update. Nationally, the CDC reported 6,707 laboratory-confirmed domestic cases since May 1 and more than 11,500 additional unresolved cases across 45 states.
Which foods have been linked to the outbreak? Shredded iceberg lettuce from central Mexico supplied by Taylor Farms de Mexico has been tied to a nine-state cluster and was recalled in July. Other clusters have no identified source, and no positive product sample has been confirmed. Past outbreaks have involved raspberries, bagged salads, cilantro and basil.
Who is most at risk of serious illness? Older adults, people who are immunocompromised, and people with chronic kidney or heart conditions face the greatest risk, primarily because prolonged diarrhea can cause severe dehydration. Most otherwise healthy adults recover, and antibiotic treatment shortens the illness.
Does washing produce remove the parasite? Rinsing reduces risk but does not eliminate it, and sanitizing rinses may not either. Michigan officials recommend buying whole heads of lettuce, discarding outer leaves, washing thoroughly, and cooking greens when possible.
When should someone see a doctor? Watery diarrhea lasting more than a few days warrants a call to a clinician, and cyclospora testing should be requested specifically. Signs of dehydration such as minimal urination, dizziness, or confusion require prompt evaluation.
