An outbreak of cyclosporiasis, a gastrointestinal illness caused by the microscopic parasite Cyclospora cayetanensis, has been reported across multiple states in the United States. As of July 8, 2026, Michigan has documented nearly 1,000 cases, marking it as the largest outbreak in the state's history. The infection has also spread to neighboring Ohio, where over 500 cases have been reported, including 306 in Lucas County alone.
Cyclosporiasis is contracted through consuming contaminated food, particularly fresh produce such as raspberries, basil, lettuce, and cilantro. The infection does not spread from person to person. Symptoms can vary and may take days to two weeks to appear; they usually include gastrointestinal distress. Antibiotics are the standard treatment.
Health officials are still investigating the outbreak’s source and whether multiple or unrelated outbreaks are occurring. To help prevent infection, experts advise thoroughly washing produce before consumption.
The Centers for Disease Control and Prevention (CDC) is working with the U.S. Food and Drug Administration (FDA) and local officials to investigate clusters of cases in several states. Those people became sick after eating food in the U.S. and had not reported any travel in the fortnight before becoming ill.
In Michigan, the number of documented cases jumped from 170 on July 1 to 572 by July 4, more than triple the state's typical annual count. The state typically identifies only about 50 cases each year.
Health officials do not consider cyclosporiasis to be life-threatening. However, they recommend washing produce under running water before eating or cooking.
The CDC advises people to wash all fresh produce thoroughly before eating it and to thoroughly wash hands and kitchen surfaces too. If people have symptoms of cyclosporiasis, they should see their healthcare provider, the CDC said.
The disease is not typically transmitted from person to person.
As investigations continue, health officials are urging the public to remain vigilant and adhere to food safety practices to prevent further spread of the infection.