# Michigan Health Officials Point to Lettuce as Likely Culprit in Explosive Diarrhea Outbreak Sickening Thousands
Michigan health officials say they’ve identified a promising lead in the investigation of a fast-spreading parasitic outbreak that has already sickened thousands of residents, pointing to lettuce and salad greens as a probable source of the illness.
The Michigan Department of Health and Human Services announced Monday that ,while their investigation into the outbreak continues, current results point to lettuce or salad greens as a potential source of the illnesses in the state., The update comes as the outbreak of cyclosporiasis, a parasitic infection known for causing severe, watery diarrhea, has ballooned far beyond what the state typically sees in a full year.
## Case Numbers Surge Past 2,600
According to state data, ,reported cases of cyclosporiasis have surpassed 2,600 in Michigan, with cases jumping by more than 1,000 since Friday for a total of 2,642 reported since June 22., The scale of the outbreak becomes even more striking when compared to historical trends — ,the state typically only records 40-50 cases annually.,
Health officials confirmed ,at least 44 people have been hospitalized, so far, though the vast majority of patients are managing symptoms at home. Cases have not been confined to a single region; ,as of July 13, a total of 55 counties, plus the city of Detroit, have reported cyclosporiasis cases,, with ,most cases reported in southeastern Michigan, including Wayne County, where Detroit is located.,
Despite the mounting case count, investigators remain cautious about declaring a definitive source. ,The Michigan Department of Health and Human Services said Monday that while the investigation is ongoing, no specific type of lettuce, grower, or supplier has been identified, and other food items also have not been ruled out.,
Dr. Natasha Bagdasarian, the department’s chief medical executive, explained the reasoning behind releasing preliminary findings even without a confirmed product. ,”Although we do not have a definite product identified as the source of the outbreak, we want to let Michiganders know what we have learned so far so they can take steps to protect their families,” she said. “Early information has shown lettuce as a common product that regularly comes up during the investigation.”,
## A Painstaking Investigation
Pinning down the exact source of a cyclosporiasis outbreak is notoriously difficult, largely because of how long the parasite takes to trigger symptoms. ,Because symptoms can take up to two weeks to develop after exposure and food distribution networks are complex, officials said the investigation could take time.,
To narrow down the source, investigators have been leaning heavily on personal interviews with infected residents. ,State health officials said they have completed more than 1,000 interviews with infected individuals while working with local, state, and federal partners to trace the source of the outbreak., Bagdasarian noted just how complicated that process can be, given how far modern food supply chains stretch. ,”Produce may have been grown on the other side of the country, possibly even in other countries, then processed somewhere else before coming into Michigan,” she said.,
Officials have also worked to rule out other potential transmission routes. ,Officials emphasized there is no evidence linking the outbreak to swimming or other recreational water activities, and investigators continue to focus on contaminated produce as the likely source.,
## Outbreak Extends Beyond Michigan’s Borders
The parasitic illness isn’t confined to Michigan. ,An outbreak of diarrhea caused by the parasite cyclospora has risen to more than 3,000 cases in Michigan and Ohio combined,, with Ohio reporting a substantial share of its own. ,Ohio has reported 361 cases since June 1,, and nationally, ,as of July 10, 31 states have reported cases to the US Centers for Disease Control and Prevention, although it’s not clear whether they’re all part of the same outbreak.,
Bagdasarian said stronger federal coordination could help clarify whether Michigan’s outbreak is connected to clusters cropping up elsewhere. ,”We really need that kind of coordination to happen at the national level,” she said, adding, “As soon as other states get their numbers to the CDC, we hope they can take a broader look to see whether these outbreaks are related.”,
Complicating the picture further, cuts to public health surveillance systems have made tracking foodborne illness more difficult nationwide, according to experts following the outbreak.
## How to Protect Yourself
Cyclospora is a microscopic parasite that infects the intestines. ,It usually spreads through food or water contaminated with feces, according to the Centers for Disease Control and Prevention, and does not typically spread person-to-person.,
State health officials are urging residents in affected areas to take extra precautions when handling leafy greens. Recommendations include buying whole heads of lettuce rather than pre-washed bagged salads, discarding the outer few layers of leaves, and thoroughly rinsing the remaining leaves under running water. For greens that can be cooked, officials say heating to at least 158 degrees Fahrenheit is the most reliable way to kill the parasite, since it is resistant to standard washing and chemical disinfection.
Anyone experiencing sudden, persistent watery diarrhea is advised to contact a healthcare provider and specifically request cyclospora testing, since routine stool tests can miss the parasite. Confirmed infections are typically treated with a course of antibiotics, alongside rest and fluids to prevent dehydration.
As the investigation continues, Michigan officials say they will provide updates as more definitive findings emerge, while urging residents not to wait for a confirmed product before taking precautions with their produce.