The Michigan Department of Health and Human Services reported 700 confirmed cases of cyclosporiasis across 33 counties as of July 6, 2026.
Monroe County Hotspot and the Rapid Case Spike
The scale of this outbreak is staggering compared to historical norms. While Michigan typically sees 40 to 50 cases of cyclosporiasis annually, the state has seen 708 cases over a roughly 10-day window, a trend NBC News describes as highly unusual. The numbers are climbing precipitously; reports jumped from 170 on June 30 to 572 by July 4, eventually hitting the 700 mark by the following Monday.
Geographically, the infection is heavily clustered. Monroe County has emerged as the epicenter with 173 confirmed cases. Other high-impact areas include Washtenaw (95), Lenawee (86), and Shiawassee (62) counties.
| County | Confirmed Cases |
|---|---|
| Monroe | 173 |
| Washtenaw | 95 |
| Lenawee | 86 |
| Shiawassee | 62 |
| Wayne | 58 |
The human cost manifests as debilitating physical distress. Haley Hompstead, a Monroe County resident, described waking up on July 3 with excruciating abdominal pain and subsequently losing roughly 10 pounds in a matter of days. For many, the illness is not just a stomach bug but a functional crisis.
“I’m scared to eat, because the minute that anything hits your stomach, it doesn’t matter if it’s plain rice or a good, hearty meal, you are in so much pain.”Haley Hompstead, Monroe County resident, via WWNY
The Produce Puzzle and Distribution Hurdles
Health officials are operating on the primary hypothesis that contaminated fresh produce is the culprit, though they have yet to pin down a specific brand or grower. The investigation is complicated by the sheer volume of victims. WWNY reports that investigators are asking each patient what restaurants they’ve been to, what they ordered, where they grocery shop and what items they purchased.
The modern food supply chain further obscures the trail. Produce is often grown in one state, processed in another, and distributed across several others, creating a fragmented map for epidemiologists.
While the current source remains unidentified, the Michigan Department of Health and Human Services (MDHHS) notes that previous outbreaks have been tied to specific items:
- Bagged salad mixes and kits (romaine, iceberg, red cabbage, carrots)
- Fresh cilantro (coriander leaves)
- Fresh basil
- Raspberries
- Snow peas
- Green onions (scallions)
The urgency for commercial kitchens in southeast Michigan is high. MDHHS has advised restaurants and processors to avoid prewashed, bagged lettuce in favor of whole heads, suggesting they discard the outer 2-3 layers of leaves. For those who can cook their produce, heating food to 158 degrees Fahrenheit or higher is recommended to kill the parasite.
A Conflict in Surveillance and Diagnosis
There is a notable tension between local observations and federal data. Dr. Brian Kaminski, vice president of medical affairs at ProMedica Health System, describes the situation in southeast Michigan and northwest Ohio as an epidemic cluster. ProMedica alone has accounted for 411 cases.
However, the federal response appears more cautious. An FDA spokesperson told NBC News that they are not yet in a position to characterize the numbers as definitively unusual. Even more striking is the CDC’s stance; a spokesperson stated the agency has no evidence of a single, multistate outbreak linking the cases currently being reported in the press.
This gap may be a result of a policy shift. As of July 2025, the CDC made tracking cyclospora optional, scaling back its Foodborne Diseases Active Surveillance Network. This decision left food safety experts concerned that identifying and responding to outbreaks would become significantly harder.
The diagnostic pressure is currently overwhelming. The demand for cyclosporiasis tests is so intense that many labs cannot keep up. Because the parasite infects the small intestine and does not spread from person to person, the focus remains entirely on what people are eating.
“At this time, no specific produce grower, supplier or type of produce has been identified as the source,”Lynn Sutfin, MDHHS spokesperson, via Lansing State Journal
For those infected, the road to recovery is slow. Untreated cyclosporiasis can linger for weeks or even over a month, with symptoms that may vanish and then return. The standard treatment is the antibiotic Bactrim.
The most critical remaining question is whether the CDC’s optional tracking has created a blind spot that allowed this cluster to expand. Until a specific product is recalled, the risk remains tied to fresh produce.
Anyone experiencing sudden and ongoing diarrhea should contact their healthcare provider and local health department.
