More than 2,000 Americans have been sickened this summer by a microscopic parasite that contaminates fresh produce, causing an unusually large outbreak of cyclosporiasis. Health officials are struggling to identify the specific food source, though the high volume of cases may provide investigators their best opportunity to pinpoint the origin of the illness.
Cyclosporiasis Outbreak and Diagnostic Challenges
The current surge in cases involves a gastrointestinal illness caused by the parasite Cyclospora cayetanensis. The outbreak has affected more than 2,000 people across the United States. While the scale of the illness is significant, public health officials suggest that the sheer number of infections might eventually help them track the contaminated supply chain more effectively than in smaller, more isolated clusters.
The illness is typically transmitted through the consumption of contaminated fresh fruits and vegetables. Symptoms are frequently severe, involving watery and sometimes explosive diarrhea, bloating, stomach cramping, and loss of appetite.
For more on this story, see Michigan Reports Historic Cyclosporiasis Surge With Nearly 1,000 Cases.
Ohio Case Distribution and Clinical Impact
In Ohio, the state health department has confirmed 177 cases of cyclosporiasis, with the majority of these infections occurring after June 20. The Ohio Department of Health reported that 28 residents have required hospitalization due to the severity of their symptoms.
This follows our earlier report, Lucas County Leads Ohio in Cyclosporiasis Cases.
Dr. Bruce Vanderhoff, Director of the Ohio Department of Health, emphasized that while no deaths have been reported in the state, the condition remains a serious medical concern. "Nevertheless, this is a serious illness that can cause dehydration and require people to seek emergency medical care, and it should be taken seriously," Vanderhoff stated.
Confirmed Case Counts by County
As of July 2, 2026, the Ohio Department of Health provided a breakdown of cases across the state. Lucas and Wood counties have reported the highest numbers of infections, with 30 and 20 cases respectively.
Read also: Michigan Cyclosporiasis Cases Surge to Over 700 in Unusual Parasitic Outbreak.
| County | Number of Cases |
|---|---|
| Lucas | 30 |
| Wood | 20 |
| Franklin | 10 |
| Wyandot | 10 |
| Stark | 8 |
| Ashland | 7 |
| Crawford | 7 |
| Licking | 7 |
Patient Experiences and Ongoing Uncertainty
The search for a common source remains ongoing.
Find more reporting in our Health section.
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