Cyclospora Outbreak Tops 1,000 Cases in the US, Dozens Hospitalized

A cyclospora parasite outbreak has ballooned past 1,000 cases in the United States, making it one of the largest such outbreaks in years. Nearly 1,000 people in Michigan alone have been diagnosed with the parasitic infection that can cause weeks of watery diarrhea, making it the largest such outbreak in state history and one of the nation’s largest in years.

What is happening

Cyclospora is a microscopic, spherical parasite that commonly causes watery diarrhea, according to the CDC. The illness, called cyclosporiasis, is not usually life threatening and is typically treated with antibiotics.

Cases of the gastrointestinal illness have been on the rise in multiple states since May, according to the CDC. At least 20 people have been hospitalized nationwide so far.

Michigan is the epicenter

As of July 7, more than 708 cases of cyclosporiasis have been reported in Michigan, up from 170 several days prior. The state normally sees approximately 50 cyclosporiasis cases per year.

At least 170 cyclospora infections have been reported in Ohio since the end of June, a spokesperson for the Ohio Department of Health said. Indiana, New York and North Carolina have also reported more than 100 cases of cyclosporiasis in recent weeks.

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No source identified yet

No specific food, grower or supplier has been identified as the source so far, per the Michigan Department of Health and Human Services. In the US, past outbreaks have been repeatedly linked to imported fresh produce including cilantro, basil, raspberries, snow peas, and mesclun lettuce.

As of this writing, no recall has been issued in connection with the multistate cyclosporiasis clusters, and investigators in Michigan and at the federal level have not pinpointed a common food source.

Why the true toll is likely higher

The combined case count is almost certainly an undercount, as cyclosporiasis requires specific stool testing that is not part of standard panels. Many cases go undiagnosed.

Only a small number of documented outbreaks in the last 20 years have surpassed 1,000 cases, including a 1997 outbreak tied to Guatemalan raspberries and a 2019 outbreak linked to Mexican basil that sickened more than 2,400.

Options market and stocks to watch

Food safety scares and produce recalls tend to ripple through grocers, restaurants, and fresh-produce suppliers. Traders can watch how flow shifts around names tied to fresh produce sourcing and food retail.

Watch for reactions in FDP (Fresh Del Monte Produce) and DOLE, both directly tied to imported fresh produce categories that have historically been implicated in cyclospora outbreaks.

Grocers like KR (Kroger), which is heavily concentrated in the Midwest, and salad-kit exposed names like CVGW (Calavo Growers) could see headline risk if a specific supplier is eventually identified.

Also watch quick-service and casual dining chains such as CMG (Chipotle), which relies on fresh produce like cilantro, for any sentiment spillover if the source investigation broadens. Track other news for updates as the CDC and FDA traceback continues.

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