As of July 20, 2026, the Centers for Disease Control and Prevention (CDC) reported 4,173 confirmed cases of cyclosporiasis in the United States between May 1 and July 20, surpassing the total number of cases reported for all of 2025. The outbreak has been declared in five states, with Michigan reporting the highest number of cases, estimated between 900 and 2,100. This translates to an infection rate of nearly 15 per 100,000 people in Michigan. Other affected states include Ohio, Indiana, Kentucky, and West Virginia. Investigations are focusing on contaminated iceberg lettuce as a potential source of the outbreak. The CDC is aware of at least 7,400 additional cases that have not yet been lab-confirmed. Health agencies express concern over the increasing number and concentration of cases this year, although isolated cases occur annually without causing alarm. The situation will continue to be monitored as mitigation efforts are implemented.
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Increase in Cyclosporiasis Cases Reported in Five States
The CDC reported 4,173 confirmed cases of cyclosporiasis in the U.S. from May 1 to July 20, 2026, marking a significant increase compared to previous years. Michigan has the highest number of cases, with investigations focusing on contaminated iceberg lettuce as a source of the outbreak. Health agencies are concerned about the rising case numbers and are monitoring the situation closely.
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Cyclosporiasis: Case rates rise in five outbreak states
Increase in Cyclosporiasis Cases Reported in Five States