Cyclosporiasis outbreak in 34 US states

The CDC and state health departments are investigating a large outbreak of cyclosporiasis, a parasitic disease caused by Cyclospora cayetanensis. As of July 13, 2026, there are 1,645 confirmed cases and over 5,100 suspected cases across 34 states, with a likely linked cluster in United States — Michigan, United States — Ohio, United States — West Virginia, and United States — Kentucky. United States — Michigan alone reports over 2,600 infections. The FDA is investigating potential sources, including lettuce identified by United States — Michigan officials. The outbreak is significantly larger than previous years, with cases expected to rise through August. The CDC issued a health alert and is working with the FDA to identify contaminated products. The outbreak follows program cuts by HHS Secretary Robert F. Kennedy Jr. that removed Cyclospora from mandatory reporting in FoodNet, though the CDC states surveillance remains unchanged.