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Diarrhea-causing parasite infecting more than 1,200 in Michigan has not spread to Canada: PHAC
Health officials said the outbreak has sickened more than 1,200 people and is being traced to contaminated produce.
On Friday, July 10, 2026, the Centers for Disease Control and Prevention reported 843 confirmed domestic cases of cyclosporiasis across 31 states, with the agency investigating more than 1,500 additional reports.
Cyclosporiasis is a foodborne illness caused by the microscopic parasite Cyclospora, which typically peaks during summer months between May 1 and Aug. 31, spreading through contaminated produce rather than person-to-person.
Michigan has been hit hardest, reporting 1,562 cases as of Friday, while an NBC News tally shows nearly 3,000 cases nationwide and at least 86 people have been hospitalized.
The Food and Drug Administration remains 'actively engaged' with state partners, though no recalls have been issued, while Michigan health officials advise washing or cooking produce to reduce infection risk.
Tracking the illness is challenging because the parasite's long incubation period means people often consume contaminated food weeks before falling ill; Dr. Michael Cappello of the Yale School of Public Health stated robust surveillance is essential for prevention.