US parasite outbreak now affecting thousands in 31 states
The parasite outbreak now affecting more than 3,000 people across 31 U.S. states is driven by Cyclospora, a microscopic bowel parasite. Michigan and Ohio report the largest state-level spikes, while the CDC has confirmed 843 domestic cases, 86 hospitalizations, and no deaths.
Health officials are racing to identify what is fueling the spread as case counts climb. The story has landed among the summer's most unsettling public-health headlines—similar to other unusual outbreaks we track in our Bizarre World section.
Key Takeaways
- More than 3,000 people have fallen ill in a Cyclospora parasite outbreak spanning 31 states.
- The CDC has confirmed 843 domestically acquired cases and 86 hospitalizations; no deaths have been reported.
- Michigan reports 2,640 cases and Ohio 434—the steepest state-level increases.
- Officials have not tied this year's surge to any particular fruit or vegetable.
- Investigators are still determining whether one contaminated food item or multiple sources are responsible.
What Is Cyclospora and What Symptoms Does It Cause?
Cyclospora is a microscopic parasite that infects the bowel. According to The Daily Beast, it causes symptoms including "explosive" watery diarrhea, cramping, bloating, nausea, fatigue, and dehydration severe enough to require hospitalization.
Infections are most often linked to fresh produce such as lettuce, basil, cilantro, berries, and peas. However, officials have not connected this year's outbreak to any specific fruit or vegetable.
How Many Cases Has the CDC Confirmed?
While state health departments report thousands of illnesses, the Centers for Disease Control and Prevention has officially confirmed 843 domestically acquired Cyclospora infections across 31 states. The agency says state departments anticipate case counts "will continue to rise as data are received."
The gap between state totals and the CDC's confirmed figure reflects reporting and verification delays. Federal officials expect confirmed numbers to keep climbing as states submit additional data.
Which States Are Reporting the Most Infections?
Michigan has logged the largest spike, with state officials reporting 2,640 cases. Ohio follows with 434 infections identified by health authorities.
Federal and state investigators are still working to determine whether the illnesses stem from a single contaminated food item or multiple sources. No common supplier or product has been officially named.
Why Does This Outbreak Matter Right Now?
With 86 people hospitalized and more than 3,000 sickened, the scale of the outbreak has drawn national attention. Federal and state investigators remain focused on identifying whether a single contaminated food item or multiple sources are behind the illnesses, and the CDC expects confirmed case counts to keep climbing as states submit additional data.