Over 10,000 cyclosporiasis cases reported across the US this year

This year, the United States has seen over 10,000 confirmed cases of cyclosporiasis, an intestinal illness caused by the parasite Cyclospora cayetanensis. The Centers for Disease Control and Prevention (CDC) reported that from May 1 to August 3, 10,468 laboratory-confirmed cases were documented across 47 states, with at least 517 hospitalizations and two deaths. The CDC is also reviewing over 12,255 additional cases that require further investigation, particularly in Michigan, where many reports have emerged. The illness is primarily contracted through contaminated food or water.

Over 10,000 cyclosporiasis cases reported across the US this year
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science Published Aug 5, 2026

Topic overview

In brief

  • Over 10,000 confirmed cases of cyclosporiasis have been reported in the US this year.
  • The CDC is investigating several clusters, including a multistate outbreak linked to iceberg lettuce.
  • Public health officials are urging vigilance and food safety practices to prevent further spread.

Summary

In the United States, a significant public health concern has emerged this year with the reporting of over 10,000 confirmed cases of cyclosporiasis, an intestinal illness caused by the parasite Cyclospora cayetanensis. The Centers for Disease Control and Prevention (CDC) released data indicating that from May 1 to August 3, 10,468 laboratory-confirmed cases were documented across 47 states. This alarming rise in cases has raised concerns among health officials and the general public alike, as the illness has reached nearly every state in the country.

The CDC has also noted that at least 517 patients have been hospitalized due to the illness, and tragically, two individuals have died as a result of complications from cyclosporiasis. The agency is currently reviewing an additional 12,255 cases that have not been laboratory-confirmed or require further investigation. Many of these reports are coming from Michigan, where health officials are looking into possible exposure outside the country.

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Updated Aug 5, 2026

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