CDC Confirms Over 1,600 Cyclosporiasis Cases as Investigation Continues

State and federal health agencies have confirmed 1,645 cases of cyclosporiasis, a parasitic infection caused by Cyclospora cayetanensis, in 34 states, and are investigating an additional 5,100 suspected cases, according to the Centers for Disease Control and Prevention (CDC). A cluster of cases in Michigan, Ohio, West Virginia and Kentucky appears linked, but officials have not yet identified a specific food or produce item responsible for the surge.

The illness typically produces watery diarrhea, nausea, abdominal cramps, bloating and low-grade fever. Health experts advise washing fresh produce thoroughly to reduce risk, and emphasize the importance of oral rehydration solutions for preventing dehydration from severe diarrhea.

During a Senate hearing on the CDC director nomination, Dr. Erica Schwartz, the president’s nominee, described cyclosporiasis as a serious disease and pledged to work with CDC scientists to improve reporting and surveillance. Senator Patty Murray questioned the nominee about recent cuts to the FoodNet surveillance program, which had reduced reporting on foodborne illnesses such as Cyclospora.

Former FDA officials suggested that water used in agricultural production may play an under-recognized role in transmitting the parasite, noting that past outbreaks linked to produce were often traced back to contaminated irrigation or wash water.

Michigan health officials have highlighted lettuce or salad greens as a possible source for the state’s outbreak, though no specific supplier has been identified and other foods have not been ruled out.