CDC says nearly 7,000 people may have cyclosporiasis as lab-confirmed cases and additional investigations rise

The Centers for Disease Control and Prevention is investigating a nationwide cyclosporiasis outbreak, with federal figures indicating nearly 7,000 people in the United States may have the parasitic, foodborne illness, according to a report published July 15.

CDC data cited by The Hill show 1,645 lab-confirmed domestic cases of cyclosporiasis. In addition to those confirmed cases, the CDC reported that 5,100 more cases were under investigation, a separate count that increases the potential number of affected people when combined with confirmed results.

Cyclosporiasis is caused by the parasite Cyclospora, which can lead to prolonged gastrointestinal illness, including weeks of intestinal discomfort and diarrhea, the CDC said in the same reporting. The agency’s investigation count reflects ongoing case review rather than a fully confirmed total.

The CDC’s figures suggest the outbreak response is still in a data-gathering phase, with investigation numbers likely to change as laboratories test samples and as health departments review new reports. The confirmed domestic count, along with the investigation list, indicates the scale of the federal public health tracking effort.

In the near term, the practical stakes for public safety are tied to identifying the contaminated food source and improving early recognition of symptoms among people who may have been exposed. Because the illness can involve ongoing diarrhea and stomach-related symptoms for extended periods, health systems may face additional demand for clinical evaluation and follow-up.

The federal investigation also underscores the role of intergovernmental reporting, with state and local health departments typically involved in case reporting, specimen collection, and follow-up when the CDC designates outbreaks for monitoring.

The CDC’s ongoing update process means the “under investigation” number may rise or fall as laboratory confirmation and epidemiologic review proceed, and officials may provide further information as they narrow potential exposure pathways.

The Hill reported the latest federal totals as part of the CDC’s public communications on the outbreak, reflecting the agency’s effort to quantify confirmed cases while continuing to assess additional suspected infections.