The Centers for Disease Control and Prevention (CDC) reported 145 cases of cyclosporiasis in 17 U.S. states between May 1 and June 16, 2026. State health departments in Michigan and New York have also reported high numbers of cases, though federal and state health officials have stated there is no evidence of a single multistate outbreak linking all cases.

At least 20 of the reported cases required hospitalization. The individuals affected in the United States ranged in age from 5 to 86 years, and 61% of them were women. Symptom onset dates for the reported cases spanned from May 1 to June 6, 2026. No deaths have been reported in connection with these cases.

In Michigan, the Department of Health reported at least 170 cyclosporiasis cases across seven counties over a nine-day period. These cases were concentrated in Monroe, Lenawee, Washtenaw, Wayne, Livingston, Shiawassee, and Jackson counties. Monroe County recorded 70 cases, Lenawee County had 33 cases, and Washtenaw County reported 21 cases. Wayne, Jackson, and Shiawassee counties reported 12, 7, and 7 cases respectively. An additional 24 cases were reported in other counties and the city of Detroit. Michigan typically identifies about 50 cases of cyclosporiasis annually.

Natasha Bagdasarian, executive medical director, said in a podcast interview that outbreaks of cyclosporiasis have been reported throughout the United States and now in Michigan as well. "Debido al número inusual de casos que hemos identificado en poco más de una semana, prevemos que se reportarán más casos," Bagdasarian said. She added that officials recommend Michigan residents contact their doctor if they experience sudden and persistent diarrhea and reach out to their local health department if other family members show the same symptoms.

New York State, excluding New York City, recorded 107 cases since May 1, 2026. The state typically records between 500 and 700 cases each year. Investigations to identify possible sources of infection are ongoing across both federal and state levels, and no specific food has been identified in the current outbreaks. The CDC indicated that cases currently under investigation did not report travel outside the country in the two weeks prior to becoming ill.

Cyclospora is a single-celled parasite that causes cyclosporiasis and is transmitted through human feces. The parasite contaminates food when crops are sprayed with water containing feces. Primary symptoms of cyclosporiasis include frequent watery diarrhea, loss of appetite, and low-grade fever. Symptoms can begin two to fourteen days after eating contaminated food. Jennifer Bonsky, director of the human food division at the Michigan Department of Agriculture and Rural Development, emphasized the importance of food safety. "En estos momentos, es aún más importante seguir todas las pautas esenciales para la preparación de alimentos, como lavarse las manos antes y después de preparar los alimentos y lavar las frutas y verduras antes de consumirlas," Bonsky said. Heat kills the Cyclospora parasite, but bleach does not.