An intestinal illness caused by a parasite is on state officials’ radars, with hundreds of cases reported in Michigan and Ohio.

HARRISBURG, Pa. — Health officials around the country are monitoring a rising number of cases of cyclosporiasis — a parasitic infection that causes “explosive” diarrhea and intestinal infection. 

Pennsylvania is one of at least 18 states reporting cases of the illness, which typically rise during spring and summer months each year. So far this year, the Commonwealth has recorded 28 cases, mostly centered around southeast and southwest regions. 



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That’s not abnormal for this time of year, a spokesperson for the Pennsylvania Department of Health told FOX43. In 2025, the department recorded 40 cases. 

“Cyclosporiasis reporting is considered voluntary in Pennsylvania because it is not included on the official list of state reportable diseases,” the spokesperson said. “Despite that, the Department of Health still collects, investigates and reports the data received about it to the Centers for Disease Control and Prevention on a weekly basis.”

The situation is different in other states. Michigan, which typically sees about 50 cases each year, reported a total of 572 cases this week. Ohio, meanwhile, reported 177 cases. In mid-June, the CDC reported 17 states had reported cases, but that number has likely increased.

According to state health officials, people can become infected by consuming food or water containing the Cyclospora cayetanensis parasite, which has been traced to produce, including bagged salad. Officials recommend washing all fresh produce and cooking food to 158 degrees or higher. 

“Pennsylvanians are most likely to be infected after eating fresh produce imported from tropical and subtropical regions where cyclosporiasis regularly occurs, or while traveling to those regions,” the DOH spokesperson said.

The illness can result in frequent and painful bowel movements but is not considered life-threatening. Those who are experiencing symptoms are encouraged to reach out to their healthcare provider.