Reviewed By: The Spiros Law Team | Last Reviewed & Updated: August 6, 2026
Quick Answer
Cyclospora is a parasite that can cause a foodborne illness called cyclosporiasis. It is often linked to contaminated fresh produce, including bagged salads, herbs, and berries.
Because Cyclospora is not included in many routine stool tests, it can be difficult to diagnose. If contaminated food caused your illness, you may be able to pursue a claim against the grower, processor, distributor, restaurant, or another responsible party.
What Is Cyclospora?
Cyclospora is a parasite that spreads through contaminated food or water.
Unlike some other foodborne illnesses:
- It does not spread from person to person.
- It is commonly linked to fresh produce.
- Symptoms often last longer than a typical stomach illness.
Common Symptoms
Symptoms may include:
- Frequent watery diarrhea
- Stomach cramps
- Bloating and gas
- Nausea
- Loss of appetite
- Weight loss
- Fatigue
- Low fever
Without treatment, symptoms can last for several weeks and may improve before returning.
When Do Symptoms Start?
Most people develop symptoms about one week after eating contaminated food, although they can begin anywhere from two days to two weeks later.
Because symptoms often appear several days after exposure, many people do not immediately connect their illness to a specific meal.
Why Cyclospora Can Be Missed
Cyclospora is not included in many standard stool tests.
Your healthcare provider may need to order a specific test to detect the parasite.
If you continue having digestive symptoms after eating fresh produce, ask your provider whether Cyclospora testing is appropriate.
A confirmed diagnosis can also provide important evidence if you pursue a legal claim.
How Is Cyclospora Treated?
Treatment usually includes prescription antibiotics.
Recovery varies from person to person.
Some people recover within a few weeks, while others experience:
- Ongoing diarrhea
- Dehydration
- Weight loss
- Fatigue
- Longer recovery times
People with weakened immune systems may experience more severe illness.
Can Cyclospora Cause Long Term Problems?
Most people recover completely, but some experience lasting effects, including:
- Extended time away from work
- Weight loss
- Dehydration
- Ongoing digestive symptoms
- Multiple medical visits before receiving the correct diagnosis
Example: The 2018 McDonald’s Cyclospora Outbreak
In 2018, a multistate Cyclospora outbreak was linked to salads served at McDonald’s restaurants.
Health officials confirmed hundreds of illnesses, including many cases in Illinois. Investigators traced the outbreak to contaminated produce supplied through the food distribution chain.
This investigation shows how health officials identify the source of an outbreak and how that evidence may support legal claims.
Your Legal Rights
Depending on how the contamination occurred, a claim may involve:
- The farm or grower
- The food processor
- The distributor
- The restaurant or retailer
Food poisoning claims may be based on strict product liability, negligence, or both.
If many people became sick from the same contaminated food, your claim may also become part of a mass tort while still remaining an individual case.
What Should You Do If You Think You Have Cyclospora?
If you believe contaminated food caused your illness:
- Get medical care.
- Ask about Cyclospora testing.
- Keep your medical records and test results.
- Save receipts and food packaging when possible.
- Write down what you ate and when symptoms began.
- Report your illness to your local health department.
- Contact a personal injury attorney as soon as possible.
What Compensation May Be Available?
A successful claim may include compensation for:
- Medical expenses
- Lost wages
- Pain and suffering
- Delayed diagnosis, when applicable
- Long term health complications
How Long Do You Have to File a Claim?
In most cases, Illinois gives you two years to file a personal injury lawsuit related to a Cyclospora infection.
Because diagnosis can sometimes be delayed, it is important to speak with an attorney as soon as possible.
Why Choose Spiros Law?
Cyclospora cases often involve complex food supply chains and delayed diagnoses.
Spiros Law investigates where the contamination occurred, identifies the responsible parties, and helps preserve evidence needed to support your claim.
If you became sick after eating contaminated food in Illinois, contact Spiros Law for a free consultation.
Frequently Asked Questions
Do I need a positive lab test?
A positive test can strengthen your claim, but other evidence may also help establish your case.
How long after eating contaminated food do symptoms begin?
Symptoms usually begin about one week after exposure but can appear anywhere from two days to two weeks later.
Is Cyclospora contagious?
No. Cyclospora spreads through contaminated food or water, not from person to person.
Can I file a claim if my illness was part of a larger outbreak?
Yes. A documented outbreak may provide additional evidence that supports your claim.
What if my doctor did not test for Cyclospora?
Because Cyclospora is not included in many routine stool tests, delayed diagnosis is common. A missed diagnosis does not automatically prevent you from pursuing a claim.
Sources
- 735 ILCS 5/13-202 (Illinois Code of Civil Procedure): Governs Illinois’s two-year statute of limitations for filing personal injury lawsuits, including foodborne parasite infection claims.
- Restatement (Second) of Torts § 402A: Sets the legal standard for strict products liability, holding growers, processors, distributors, and restaurants liable for selling adulterated food.
- CDC Cyclosporiasis Clinical & Outbreak Information: Outlines symptom progression, incubation timelines, specialized diagnostic testing protocols, and treatment regimens.
- FDA Cyclospora Prevention, Outbreaks & Safety Guidelines: Details produce supply chain investigations, agricultural water risks, and environmental traceback procedures for fresh produce contamination.
- Illinois Department of Public Health (IDPH) — Infectious Disease Reporting: Manages mandatory communicable disease reporting (via I-NEDSS), outbreak cluster detection, and local county health interviews in Illinois.
Learn More
- CDC Guide: Symptoms & Clinical Care of Cyclosporiasis: Insights on why routine stool cultures miss Cyclospora and how physicians run specialized Ova & Parasite (O&P) or PCR testing.
- Illinois Department of Public Health — Report a Foodborne Illness: Step-by-step guidance on contacting your local health department to log a suspected Cyclospora exposure.
- Mass Torts vs. Individual Claims in Parasitic Outbreaks: How multi-state produce outbreaks are coordinated in court while preserving individualized damages for medical costs and lost work.
Disclaimer: This article is for informational purposes only and does not constitute legal or medical advice. Always consult a healthcare provider for diagnosis and treatment, and contact Spiros Law for guidance specific to your legal situation.
