Cyclosporiasis Outbreak Expands Across 9 U.S. States, More Than 12,000 Cases Reported

A foodborne illness outbreak caused by the microscopic parasite Cyclospora has spread to at least nine U.S. states, with more than 12,000 cases of cyclosporiasis reported, according to health officials.

CNN, citing an anonymous official from the U.S. Centers for Disease Control and Prevention (CDC), reported that the outbreak has now been identified in Indiana, Kentucky, Michigan, Ohio, West Virginia, Illinois, Kansas, Oklahoma, and Pennsylvania.

Federal and state health authorities are jointly investigating the outbreak to determine its source and scope.

According to officials, the nine affected states have collectively recorded more than 12,000 infections, with Michigan reporting the largest share of cases. If investigators confirm that the illnesses are linked to a single source, it would rank among the largest foodborne disease outbreaks in the United States in the past three decades.

Health investigators interviewed patients and found that imported iceberg lettuce from central Mexico is the most likely source of the infections.

The U.S. Food and Drug Administration (FDA) is working with Mexican health authorities to trace the source of the contamination and determine how the parasite entered the food supply.

In response to the investigation, Taylor Farms announced a voluntary recall of its processed shredded lettuce products. The recalled lettuce had been distributed to restaurants, food service providers, and retailers across 27 U.S. states.

Cyclosporiasis is an intestinal illness caused by the parasite Cyclospora cayetanensis. Symptoms typically include prolonged diarrhea, loss of appetite, stomach cramps, nausea, fatigue, and weight loss. Health officials advise consumers to seek medical attention if they experience persistent gastrointestinal symptoms after consuming fresh produce.

The CDC and FDA continue to monitor the outbreak and are urging consumers and food businesses to follow recall notices and food safety guidance as the investigation continues.