Health officials in Michigan and Ohio are reporting a significant surge in cases of cyclosporiasis, an intestinal infection caused by the parasite Cyclospora cayetanensis. According to the Michigan Department of Health and Human Services (MDHHS), the state has confirmed 678 cases as of July 6, a figure roughly 13.5 times higher than the annual average of 50 cases.
Dr. Natasha Bagdasarian, Michigan’s chief medical executive, noted that the number of cases is likely to rise further due to the long incubation period of the parasite, which can take up to two weeks for symptoms to appear. The majority of Michigan’s cases are concentrated in the southeastern region, including Wayne County. Meanwhile, officials in Ohio have reported 177 cases across 43 counties as of July 2.
While investigators have not yet identified a specific source for the outbreak, the MDHHS and the CDC are operating under the working hypothesis that the parasite is being spread through contaminated fresh produce. Common symptoms of the infection include “explosive” watery diarrhea, abdominal cramping, and nausea. Unlike typical stomach bugs, these symptoms can persist for weeks if left untreated.
Health authorities recommend that individuals experiencing persistent gastrointestinal distress seek medical attention and specifically request stool testing for Cyclospora, as it is not always included in routine panels. To prevent infection, the CDC advises thoroughly washing all fresh produce and refrigerating pre-cut fruits and vegetables. The infection is treated with a 10-day course of antibiotics, typically trimethoprim-sulfamethoxazole.