Michigan cyclospora cases rise to 572 as CDC reports 145 U.S. cases across 17 states

Michigan’s cyclosporiasis outbreak kept growing over the holiday weekend. The state health department said reported cases reached 572 on July 4, and officials still have not identified a specific produce grower, supplier, or produce type as the source.

That also makes this a national watch item. The CDC said on July 1 that it had received reports of 145 cases acquired in the United States across 17 states from May 1 through June 16. The agency said there is no evidence yet of a single multistate outbreak linking all of the cases.

What cyclosporiasis is

Cyclosporiasis is an intestinal illness caused by the Cyclospora parasite. People can get sick after eating food or drinking water contaminated with the parasite. Symptoms often include watery diarrhea, stomach cramps, nausea, fatigue, and fever. Illness may start about a week after exposure, but the timing can vary.

Health officials say the illness is usually treated with antibiotics and fluids. Dehydration is the main concern for many patients, especially young children, older adults, and people with weakened immune systems.

Why investigators have not pinned down the source

Foodborne outbreaks can take time to trace. Produce moves through many hands, contamination may be uneven, and people often do not remember every item they ate days before symptoms began. That is why public health officials are warning people not to assume one specific item is responsible until investigators confirm it.

Michigan officials said the largest increases are in southeast Michigan, with case totals highest in Monroe, Lenawee, Washtenaw, Wayne, Shiawassee, Jackson, Oakland, and Livingston counties. WCMU reported that Shiawassee County had seven confirmed cases as of July 2, adding local context to the broader state picture.

What readers should do now

Officials are urging basic food-safety steps: wash fresh produce under clean running water, cook foods when possible, refrigerate cut or peeled produce quickly, and follow any state or local health alerts. If you develop sudden and ongoing diarrhea, especially after eating fresh produce, contact a health care provider and your local health department.

The key next development is whether investigators identify a common source or issue a targeted warning. Until then, this remains an active, unresolved outbreak with a clear Michigan center and a wider national footprint.

Sources

• Michigan Department of Health and Human Services, July 4 cyclosporiasis update
• CDC Surveillance of Cyclosporiasis
• WCMU Public Media report on Shiawassee County cases
• NBC Chicago report on the U.S. cyclosporiasis surge