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What Is Cyclospora, the Parasite Causing ‘Explosive’ Diarrhea Across the U.S.?

The CDC said 145 cases have been reported nationwide, and Michigan has logged nearly 800 as health officials warn the true count may be higher.

  • Nearly 1,000 people in Michigan have been diagnosed with cyclosporiasis, marking the state's largest outbreak in history. Michigan chief medical executive Dr. Natasha Bagdasarian confirmed, "There is clearly a linked outbreak happening right now."
  • Cyclosporiasis spreads through contaminated food or water, often fresh produce, causing prolonged "explosive" diarrhea. Because symptoms appear 2 to 14 days after exposure, public health officials struggle to pinpoint infection sources.
  • Beyond Michigan, at least 145 cases have been reported across 17 states, including 306 in Lucas County, Ohio. The Centers for Disease Control and Prevention reports 20 hospitalizations nationwide linked to cyclospora, but no deaths.
  • Dr. Zoe Weiss, director of clinical microbiology at Tufts Medical Center, noted that cyclosporiasis "can be really challenging to distinguish" from other foodborne illnesses, requiring specific stool sample testing.
  • Outbreaks typically occur between May and August, as the cyclospora parasite resists standard washing. Michigan health officials advise cooking produce to 158 degrees F to reliably kill the parasite.
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NBC ChicagoNBC Chicago
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Outbreak of diarrhea-causing parasite grows to more than 1,000 cases

Nearly 1,000 people in Michigan have been diagnosed with cyclospora as of Wednesday, though no deaths have been reported.

·Chicago, United States
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CNN broke the news in Atlanta, United States on Tuesday, July 7, 2026.
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