TL;DR
Illinois health officials report an outbreak of cyclospora, a parasite causing severe diarrhea. The CDC is investigating the source, which remains unknown. This development raises public health concerns.
The Centers for Disease Control and Prevention (CDC) is investigating an outbreak of cyclospora, a parasite causing severe diarrhea, in Illinois. The source of the infections remains unidentified, and public health officials are urging caution as they work to determine the cause.
Illinois health authorities have reported an increase in cases of severe diarrhea linked to cyclospora, a microscopic parasite that causes gastrointestinal illness. The CDC has confirmed that more than 50 cases have been identified across multiple counties, with patients experiencing symptoms including diarrhea, cramping, nausea, and fatigue. The investigation is ongoing, and no specific food, water source, or location has yet been confirmed as the origin of the infections.
Health officials emphasize that cyclospora is typically contracted through contaminated food or water, but pinpointing the exact source has proven challenging. The CDC is collecting samples from patients and potential sources, and they are working with local agencies to trace possible common exposures. No fatalities have been reported so far.
Public Health Impact of the Cyclospora Outbreak
This outbreak is significant because cyclospora infections can lead to prolonged gastrointestinal symptoms and may require medical treatment, particularly in vulnerable populations. The unidentified source raises concerns about food safety and water quality in Illinois, and the investigation highlights the importance of prompt detection and response to parasitic outbreaks. Public awareness and caution are advised until the source is identified and containment measures are in place.

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Background on Cyclospora and Recent Outbreaks in the U.S.
Cyclospora cayetanensis is a protozoan parasite that causes cyclosporiasis, a gastrointestinal illness characterized by diarrhea, stomach cramps, and nausea. It is often linked to contaminated fresh produce, such as berries or leafy greens, and contaminated water sources. Outbreaks have occurred periodically across the U.S., with the CDC tracking several large-scale incidents in recent years, often associated with imported produce. The current Illinois outbreak is among the latest in a series of investigations into food- or waterborne parasitic infections.
“We are actively investigating the source of these infections and are advising the public to practice good hygiene and food safety measures.”
— Dr. Lisa Martinez, Illinois Department of Public Health

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Unconfirmed Source and Ongoing Investigation Details
It is not yet clear what specific food, water source, or location is responsible for the infections. The investigation is still in progress, and no definitive link has been established. Public health officials have not issued any recalls or specific warnings beyond general precautions.

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Next Steps in the CDC’s Outbreak Response
The CDC and Illinois health officials will continue collecting and analyzing samples from patients and potential sources. An update on the investigation and any identified source is expected within the coming weeks. Public health advisories may be adjusted based on new findings.

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Key Questions
What is cyclospora and how is it transmitted?
Cyclospora is a microscopic parasite that causes gastrointestinal illness, typically transmitted through contaminated food or water, especially fresh produce like berries and leafy greens.
What are the symptoms of cyclospora infection?
Symptoms include diarrhea, stomach cramps, nausea, bloating, and fatigue. Symptoms can last for weeks if untreated.
Is the outbreak limited to Illinois?
Currently, cases have been reported in Illinois, but health authorities are monitoring for potential spread or additional cases in neighboring states.
Should I be concerned about my food or water safety?
Public health officials recommend practicing good hygiene, washing produce thoroughly, and following any advisories issued by local health departments.
When will the source of the outbreak be identified?
The investigation is ongoing, and officials expect to have more information in the coming weeks. No specific timeline has been provided yet.
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