Cyclosporiasis Cases Top 700 in Michigan After July Fourth, With 36 Hospitalizations

Cases of cyclosporiasis, a parasite-caused illness tied to “explosive” watery diarrhea, have continued to spread across the United States, topping 700 in Michigan as the week after July Fourth unfolded.

“Cases of parasitic infection growing in 2 states: Health officials Cases in Michigan are currently about 13”

ABC News

USA Today reported that between June 22 and Monday, July 6, Michigan recorded more than 700 cases of cyclosporiasis, with 36 resulting in hospitalizations, while the CDC said there is “no evidence of a single, multistate Cyclospora outbreak linking all cases.”

ABC News

The Detroit Free Press said the first known Michigan case in the outbreak was reported June 22 and that public health investigators had yet to identify a common source as of July 7.

In Michigan, the highest volume of cases was reported in southeastern Michigan, with most being reported in Monroe, Washtenaw, Lenawee, Shiawassee, Wayne, Jackson, Oakland, Ingham and Livingston counties, according to the Detroit Free Press.

The CDC’s surveillance window for annual cyclosporiasis surges runs from May 1 to Aug. 31, USA Today reported, as local and federal authorities continued working to identify potential sources for illness clusters.

Michigan health officials told residents to contact their health care provider and their local health department if they experience gastrointestinal illness such as sudden and ongoing diarrhea, as USA Today and the Detroit Free Press both quoted.

USA Today reported that Lynn Sutfin, a Michigan Department of Health and Human Services spokesperson, said, "At this time, no specific produce grower, supplier or type of produce has been identified as the source," while the Detroit Free Press said Laina Stebbins similarly stated, "At this time, no specific produce grower, supplier or type of produce has been identified as the source."

Ars Technica

The Detroit Free Press described cyclosporiasis as caused by the microscopic cyclospora cayatenensis parasite and said it does not typically spread from person-to-person, but instead infects people when they eat or drink food or beverages contaminated with fecal matter.

Michigan’s prevention guidance emphasized washing hands with soap and water before and after handling or preparing food and washing all fresh produce under clean running water, even if people plan to peel it, according to the Detroit Free Press.

The CDC and state guidance also stressed that heating food to 158 degrees or higher kills the parasite, and the Detroit Free Press said the recommendations apply to anyone preparing, processing or serving raw produce, including restaurants and commercial kitchens.

While Michigan led the count, USA Today said cases of cyclosporiasis were also reported in other states, including New York with 301 total cases as of July 7 and Ohio with 177 cases in 43 counties so far in 2026.

“The number of reported cases of the intestinal illness cyclosporiasis has risen to 572, up from 300-plus on Thursday, the state's Department of Health and Human Services said Saturday”

CBS News

USA Today reported that New York City had recorded a total of 301 cases this year as of July 7, with 273 happening since May 1, and that the New York State Department of Health had 120 confirmed cases since May 1, 2026.

The Guardian said the CDC reported more than 400 cases across 18 states on Friday and that it was working with the U.S. Food and Drug Administration to investigate “alarming” clusters.

In Michigan, Dr Natasha Bagdasarian, Michigan’s chief medical executive, told ABC that the 678 cases reported as of Monday represented “a moving target,” and the Guardian said she described a significant lag time between exposure and symptoms.

The Guardian also noted that no deaths had been reported from the current outbreak and that the CDC said the “true number of people sick with cyclosporiasis was likely higher than the number reported,” as many victims recover without seeking medical care or testing.