Note: Single-source report; awaiting corroboration.
The CDC, along with state and federal partners, is investigating a multistate outbreak of cyclosporiasis primarily affecting at least four Midwestern states: Michigan, Ohio, West Virginia, and Kentucky. Over 400 cases have been reported as of July 13, 2026, and the outbreak may extend to additional states as investigations continue. Sick individuals reported symptom onset on or after June 22, 2026; however, the actual number of cases may be higher due to underreporting and delays in testing. Public health officials are interviewing patients and collecting data on demographics and foods consumed to identify the outbreak's source, which has not yet been confirmed.
The CDC notes an increase in cyclosporiasis cases since early May and is also investigating other clusters across the United States. Cyclosporiasis is generally not life-threatening but can cause severe illness requiring hospitalization. Symptoms typically include watery diarrhea lasting several days, fatigue, and loss of appetite, usually beginning about one week after exposure to the parasite. Infections can last from a few days up to a month or longer without treatment.
People experiencing symptoms consistent with cyclosporiasis are urged to seek medical attention promptly and may need to request specific testing for Cyclospora, as routine stool tests may not automatically screen for this parasite. Public health officials emphasize the importance of timely diagnosis and treatment for affected individuals.