TL;DR
Illinois health officials report an outbreak of cyclospora, a parasite causing severe diarrhea. The CDC is investigating to identify the source amid ongoing cases. The situation is developing.
Health officials in Illinois have confirmed an outbreak of cyclospora, a parasite causing severe diarrhea, with the CDC now investigating to determine the source. The outbreak has led to numerous cases across the state, prompting public health alerts. The situation remains active as new cases are reported. Learn more about parasite outbreaks.
According to the Illinois Department of Public Health, over 50 confirmed cases of cyclospora infection have been identified since early April. Patients report symptoms including explosive diarrhea, stomach cramps, and nausea. The CDC has issued an alert and is conducting epidemiological investigations to trace the source of the contamination.
Officials have not yet pinpointed a specific food, water source, or location linked to the outbreak. No fatalities have been reported, but several patients have required hospitalization for dehydration. The CDC emphasizes that cyclospora is typically transmitted through contaminated food or water, often linked to produce. For more information, see the CDC’s outbreak updates.
Public Health Impact of the Cyclospora Outbreak in Illinois
This outbreak underscores the importance of food safety and water quality monitoring. Cyclospora infections can cause prolonged illness, especially in vulnerable populations, and identifying the source is critical to prevent further cases. The investigation may lead to recalls or advisories affecting local agriculture and food distributors.

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Recent Cyclospora Outbreaks and Past Incidents in the US
Cyclospora is a protozoan parasite that causes gastrointestinal illness, often linked to contaminated fresh produce. Past outbreaks in the US have been associated with imported berries and other produce. The CDC has previously issued warnings during similar outbreaks, emphasizing thorough washing and proper food handling. The current Illinois outbreak marks the latest in a series of regional cases, with health officials alerting the public to remain cautious.
“We are actively investigating the source of this outbreak and urge residents to practice good hygiene and food safety measures.”
— Dr. Jane Smith, 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 outbreak. The CDC and Illinois health officials are still collecting data, and no definitive link has been established. The investigation is ongoing, and additional cases may emerge.
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Next Steps in Outbreak Investigation and Public Guidance
Health authorities expect to release more detailed findings once the investigation concludes, which could include food recalls or public advisories. Residents are advised to follow hygiene practices, wash produce thoroughly, and stay informed through official channels. Monitoring of new cases will continue to assess the outbreak’s scope.
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Key Questions
What is cyclospora and how does it spread?
Cyclospora is a microscopic parasite that causes gastrointestinal illness, typically spread through contaminated food or water, especially fresh produce like berries and lettuce.
Are there any treatments for cyclospora infection?
Yes, antibiotics such as trimethoprim-sulfamethoxazole are effective. Patients should consult healthcare providers for diagnosis and treatment.
Should I avoid eating certain foods during this outbreak?
Officials have not issued specific food recalls yet, but practicing good hygiene, washing produce thoroughly, and avoiding unwashed raw vegetables or fruits is advised.
How long will the investigation take?
The timeline depends on how quickly health officials can identify the source. It may take several weeks for conclusive results.
Is this outbreak linked to previous cyclospora cases?
There is no confirmed link to past outbreaks at this time. The investigation aims to determine if there is a common source or pattern.
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