TL;DR
The CDC is actively investigating a parasitic outbreak causing severe diarrhea in several states. The source remains unidentified, and health officials urge caution. This development highlights ongoing public health concerns. For more details, see the recent outbreak reports.
The Centers for Disease Control and Prevention (CDC) is actively investigating a parasitic outbreak linked to cases of severe, ‘explosive’ diarrhea reported in multiple states. The agency has not yet identified the source but is urging healthcare providers and the public to report suspected cases. This investigation is significant because it involves a potentially contagious parasitic infection affecting dozens of individuals across different regions.
According to the CDC, over 20 cases of a parasitic infection caused by Cyclospora have been reported across at least five states, including Illinois, Indiana, Ohio, Michigan, and Wisconsin. The affected individuals have experienced symptoms such as severe diarrhea, nausea, and dehydration, with some cases requiring hospitalization. The CDC has confirmed parasitic infection as the cause based on laboratory testing of patient samples.
The agency has not yet identified the definitive source of the outbreak, but officials suspect contaminated food or water as potential vectors. Learn more about the outbreak source. The CDC has issued advisories to healthcare providers to be vigilant for similar cases and is working with local health departments to trace the outbreak’s origin. No fatalities have been reported so far, but the situation remains under close monitoring.
Why the Parasitic Outbreak Matters for Public Health
This outbreak underscores ongoing challenges in food and water safety, especially as parasitic infections like Cyclospora are often linked to contaminated produce or water sources. The investigation highlights the importance of rapid detection and response to prevent wider spread. For the public, it raises awareness about the risks of consuming potentially contaminated food and water, particularly during warmer months when such outbreaks tend to increase. The CDC’s efforts to identify the source aim to prevent future cases and improve safety protocols.

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Background on Cyclospora and Past Outbreaks
Cyclospora cayetanensis is a parasite that causes gastrointestinal illness, typically transmitted through contaminated food or water. Outbreaks have been documented in the U.S. before, often linked to fresh produce like berries, lettuce, or herbs. The CDC has previously issued warnings during summer months when outbreaks tend to spike, but the current investigation marks a significant effort to trace this specific cluster. Past outbreaks have led to recalls and increased scrutiny of food safety practices, emphasizing the importance of source control.
“We are actively working to identify the source of this outbreak and are urging healthcare providers to report any suspected cases. Early detection is key to preventing further spread.”
— Dr. Anne Miller, CDC Epidemiologist

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Unconfirmed Source and Ongoing Investigation Details
It is not yet clear what specific food, water source, or environmental factor caused the outbreak. The investigation is still in progress, and officials have not identified a definitive source. The number of cases may also increase as testing continues and more reports are received.

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Next Steps in Outbreak Investigation and Public Guidance
The CDC and local health authorities will continue their traceback efforts to pinpoint the outbreak source. They are also monitoring additional cases and advising healthcare providers to remain vigilant. Public health officials may issue further advisories or recalls once the source is identified. Meanwhile, consumers are advised to practice good hygiene, wash produce thoroughly, and stay informed through official channels.

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Key Questions
What is Cyclospora and how does it spread?
Cyclospora is a parasite that causes gastrointestinal illness, primarily spreading through contaminated food or water, especially produce like berries, lettuce, or herbs.
How many cases have been reported so far?
Over 20 confirmed cases have been reported across five states, with ongoing investigations to identify additional cases.
Is there a risk to the general public?
While the current outbreak is localized, the risk exists for anyone consuming contaminated produce or water. Practicing good hygiene and food safety measures is recommended.
When will the source of the outbreak be identified?
The investigation is ongoing, and no specific timeline has been provided for identifying the source. Authorities continue to work actively on the case.
What should people do if they experience symptoms?
Individuals experiencing severe diarrhea, nausea, or dehydration should seek medical attention and report their symptoms to healthcare providers.
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