TL;DR
More than 1,000 people in the US have been diagnosed with cyclosporiasis, a parasitic infection caused by Cyclospora. Health officials are investigating contaminated produce as the source, with ongoing efforts to contain the outbreak.
Health officials have confirmed that over 1,000 cases of cyclosporiasis, a parasitic intestinal infection caused by Cyclospora, have been reported across several states in the US since late April 2024. The outbreak is linked to contaminated fresh produce, prompting warnings and investigations by the CDC and state health departments. This development highlights ongoing food safety concerns and the need for increased awareness about parasitic infections.
The Centers for Disease Control and Prevention (CDC) announced that more than 1,000 cases of cyclosporiasis have been identified nationwide, with the majority of cases concentrated in the Midwest and Northeast regions. Patients report symptoms such as severe diarrhea, stomach cramps, and fatigue, typically lasting for several weeks. The CDC has identified fresh produce, including leafy greens and berries, as the likely source of contamination based on epidemiological data and traceback investigations.
Health authorities have issued public advisories urging consumers to wash produce thoroughly and avoid consuming unwashed or raw vegetables and fruits from sources linked to the outbreak. Several grocery chains have voluntarily recalled certain produce items, and investigations are ongoing to determine the precise contamination point in the supply chain. No fatalities have been reported, but hospitalizations have occurred in some severe cases.
Why the Cyclospora Outbreak Matters for Public Health
This outbreak underscores the persistent challenges in ensuring food safety and preventing parasitic infections from contaminated produce. Cyclospora is not spread person-to-person but is transmitted through ingestion of contaminated food or water, making outbreaks difficult to control. The rising number of cases raises concerns about the safety of fresh produce in the supply chain and highlights the importance of proper handling and hygiene practices. While the outbreak is currently contained to certain regions, ongoing investigations could lead to broader food safety reforms and increased surveillance.

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Recent Trends and Past Cyclospora Outbreaks in the US
Cyclosporiasis outbreaks have occurred periodically in the US, often linked to imported produce from countries with different food safety standards. The CDC documented a similar outbreak in 2022 that affected over 600 people, also traced to contaminated berries. The parasite Cyclospora is resistant to standard cleaning methods, requiring thorough washing and sometimes chemical treatment. The current surge of cases reflects both increased consumption of fresh produce and ongoing vulnerabilities in the food supply chain.
Public health officials have emphasized that proper hygiene, including washing produce thoroughly, can reduce but not eliminate the risk of infection. The outbreak coincides with the peak season for certain fruits and vegetables, complicating efforts to contain it swiftly.
“We are actively investigating the source of this outbreak and urge consumers to wash all produce carefully. The number of cases indicates a significant public health concern.”
— Dr. Anne Schuchat, CDC
Unclear Aspects of the Outbreak Source and Spread
While investigations point to contaminated produce, the specific source or farm of origin has not yet been publicly identified. It is also unclear whether the contamination resulted from agricultural practices, processing, or distribution issues. The full scope of the outbreak and the potential for further cases remain under review, and authorities have not yet confirmed if additional food items are involved.
Next Steps in Outbreak Investigation and Public Guidance
Public health agencies are continuing traceback investigations to identify the contaminated source and implement targeted recalls. Monitoring and testing of supply chains are ongoing, and updates are expected in the coming weeks. Officials will also reinforce public advisories on food safety and may issue additional recalls if necessary. Consumers are advised to wash produce thoroughly and stay alert for further guidance from health authorities.
Key Questions
What is cyclospora, and how is it transmitted?
Cyclospora is a parasite that causes cyclosporiasis, an intestinal illness. It is transmitted through ingestion of contaminated food or water, particularly fresh produce like berries and leafy greens.
What are the symptoms of cyclosporiasis?
Common symptoms include severe diarrhea, stomach cramps, bloating, nausea, and fatigue. Symptoms usually appear one week after exposure and can last for several weeks if untreated.
How can consumers protect themselves from this outbreak?
Consumers should wash all fresh produce thoroughly with clean water, avoid eating unwashed raw fruits and vegetables from suspect sources, and stay informed about recalls and advisories issued by health authorities.
Are there any treatments for cyclosporiasis?
Yes, cyclosporiasis is treatable with antibiotics such as trimethoprim-sulfamethoxazole. Patients should consult healthcare providers if they experience symptoms.
Is this outbreak linked to imported produce?
Preliminary investigations suggest a link to imported produce, but the exact source has not yet been confirmed. Authorities are working to trace the contaminated items.
Source: google-trends