CDC Logs 843 Domestic Cyclosporiasis Cases Across 31 States, No Deaths Reported

The U.S. Centers for Disease Control and Prevention reported 843 confirmed domestic cases of cyclosporiasis across 31 states as of July 9, 2026. Cases have occurred since May 1. Eighty-six people required hospitalization and none died.

Patients ranged in age from 5 to 88 years, with a median age of 44. An additional 343 people contracted the infection while traveling abroad. The CDC stated it is aware of more than 1,500 cases that require further analysis to confirm domestic acquisition.

Michigan reported 700 cases to state health officials as of July 6, 2026, and more than 1,200 cases according to later state data. The CDC dashboard showed between 161 and 300 cases for the state as of July 9. Ohio recorded 364 cases as of July 9, with 358 occurring after May 1 and 46 hospitalizations.

North Carolina reported 205 cases between May 1 and July 9. New York City recorded 301 cases as of July 7, including 273 since May 1. New York State confirmed 120 cases between May 1 and July 7. The state recorded between 500 and 700 cases in each of 2024 and 2025.

The CDC assumes a six-week reporting lag between illness onset and case reporting. Because cases are rising rapidly, the agency will begin requesting state data weekly instead of monthly. The U.S. cyclosporiasis season runs from May 1 through the end of August.

Cyclosporiasis is caused by the parasite Cyclospora cayetanensis and spreads through contaminated food, drinks or surfaces via the fecal-oral route. People typically become ill about one week after exposure, though symptoms can appear in as few as two days or as many as two weeks. The most common symptom is watery, frequent diarrhea.