Ohio Battles Explosive Diarrhea Outbreak

Ohio is currently experiencing a sharp increase in cyclosporiasis cases, placing it second in the nation for this intestinal parasite outbreak. As of July 9, 2026, Ohio health officials reported 364 confirmed cases across 51 counties, with 46 individuals requiring hospitalization. This number more than doubled from the previous week, with most new infections occurring since mid-June.

Michigan has reported the highest number of cases nationwide, exceeding 1,250 since late June. The parasitic illness, caused by cyclospora cayetanensis, leads to symptoms like explosive diarrhea, fatigue, and nausea. While typically not life-threatening, symptoms can persist for several weeks. The U.S. has seen over 1,000 reported infections nationally.

Investigations into the source of the outbreak are underway, involving state and federal health partners. Cyclosporiasis typically spreads through contaminated food or water. In the U.S., outbreaks have frequently been linked to fresh produce. Health authorities recommend safe food-handling practices and avoiding potentially contaminated water sources to prevent infection.