Cyclospora Infections Surge Across the US in 2026

Reports indicate a significant increase in infections caused by the parasite cyclospora in 2026, making it potentially the worst year for such cases in the US. With over 30 states affected, current data suggests exceeding the record of about 4,700 reported cases, set in 2019. Although these infections are not life-threatening, antibiotics are commonly used for treatment. A definitive cause for the surge remains unclear, but federal health officials have noted varying infection patterns across different regions.

In Michigan, where more than 3,300 cases have been documented, health officials suspect lettuce or salad greens as a possible cause. After interviewing over 1,000 patients, lettuce emerged as a frequent element in their diets. Natasha Bagdasarian, Michigan’s chief medical executive, mentioned the recurring appearance of lettuce during investigations. Because produce has been linked to past cyclospora outbreaks, officials recommend purchasing whole lettuce heads, discarding outer layers, and thoroughly washing them. They also advise against bagged lettuce and pre-mixed salad kits.

Taco Bell took precautionary measures by temporarily removing certain ingredients in select locations, closely monitoring the situation and adhering to public health guidance. Federal health officials have not pinpointed any specific food vendor or distributor for further investigation. Donald Prater from the FDA stated the agency continues traceback investigations on multiple produce items.

Cyclospora causes watery diarrhea with frequent and sometimes explosive bowel movements, according to the CDC. Outbreaks are more common in late spring and summer. The parasite spreads through feces, often infecting plants exposed to contaminated irrigation water.

Cyclosporiasis is less prevalent compared to illnesses from other germs like salmonella and E. coli. Historically, cyclospora cases were underreported, partly due to testing inadequacies. Experts attribute the rise in cases to climate change and improved detection methods.

In 2019, the US experienced its most severe spike in cyclospora infections, with about 4,700 cases. According to CDC data, which trails individual state reporting, recent health alerts point to over 1,645 confirmed cases since May 1, with an additional 5,100 cases needing further analysis to confirm domestic origins. As of now, reports spanning 34 states show no fatalities. Gwen Biggerstaff from the CDC noted that mild illnesses often go unreported, and case numbers are expected to rise through August.

Some states report varying numbers: Michigan over 3,300 cases, northwest Ohio over 1,100, New York City over 400, and Illinois more than 200. Travel outside the US has been a factor in some Illinois cases. CDC officials suspect a shared domestic outbreak in Michigan, Ohio, Kentucky, and West Virginia, without detailing sources.