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If you have had watery diarrhea that just will not go away this summer, you are not alone. Right now, health officials across the United States are watching a growing outbreak of a tiny parasite called Cyclospora. It spreads through contaminated food, mostly fresh fruits and vegetables, and it can cause weeks of stomach trouble.
In this article, you will learn what Cyclospora is, how many people are sick, which states are affected, what the symptoms look like, and simple steps you can take to protect yourself and your family. All the facts here come from the CDC, FDA, and trusted health reporting, with direct links so you can check them yourself.
What Is Cyclospora?
Cyclospora cayetanensis is a tiny, single-celled parasite. You cannot see it with your eyes. When it gets into your body, it causes an intestinal illness called cyclosporiasis. The main sign of this illness is watery diarrhea that can last for weeks, according to the CDC's official cyclosporiasis page.
This parasite is not new. It shows up almost every year in the US during spring and summer. But 2026 has been a busier season than usual, and that is why it is in the news right now.
Which States Are Affected?
Cases in 2026 have been reported in these states, according to CDC and local health department data:
- New York (one of the highest case clusters)
- Michigan (the largest single surge)
- Illinois
- Texas
- Ohio
- Florida
- Georgia
- North Carolina
- Pennsylvania
- New Jersey
- Massachusetts
- Connecticut
- Virginia
- Tennessee
- Wisconsin
- Colorado
- Louisiana
- Alaska
The CDC has said clearly that, so far, there is no confirmed proof that all these cases come from one single source. Investigators are instead looking into several separate clusters that may each have their own cause.
What Foods Are Being Investigated?
Health officials have not confirmed a single food source yet. But according to CNN, which reviewed internal CDC communication, investigators are looking into possible links between some clusters and:
- Mexican-style restaurants
- A grocery chain
- A catered event
- White and green onions
- Cucumbers
- Cilantro
It is worth saying clearly: no official recall has been announced as of this writing. Past cyclosporiasis outbreaks in the US have been linked to fresh produce like raspberries, basil, cilantro, snow peas, and mesclun lettuce salad mixes
Here is something that surprises a lot of people: washing your produce does not reliably remove this parasite. The FDA has said that regular rinsing is unlikely to get rid of Cyclospora once it is on food. That is a strange fact, but it is true, and it is why the source of contamination matters so much to investigators.
How Does Cyclospora Spread?
Cyclospora spreads when people eat food or drink water that has been contaminated with human feces. That sounds unpleasant, and it is. But understanding this helps explain why it is so hard to trace.
A few key facts about how it spreads:
- It is not spread from person to person, like a cold or the flu.
- You cannot catch it just by being near someone who is sick.
- Most cases come from contaminated fresh produce, especially leafy greens, herbs, and berries.
- It can also spread through contaminated water.
- It is more common in tropical and subtropical regions of the world, so travelers can pick it up abroad too. In fact, the CDC separately reported 45 cases in 2026 linked to travel outside the US (CDC Surveillance).
Symptoms of Cyclosporiasis
Symptoms usually begin about one week after eating or drinking something contaminated, though it can range from 2 days to 2 weeks. Here is what to watch for:
- Sudden, watery diarrhea
- Loss of appetite
- Stomach cramps and bloating
- Nausea
- Fatigue, or feeling very tired
- Weight loss
- Mild fever, though this is less common
- Vomiting, in some cases
One tricky thing about this illness: symptoms can seem to go away, and then come back again. This is called a relapse, and it can happen more than once. Without treatment, the illness can last anywhere from a few days to more than a month (CDC).
If your stomach bug has lasted way longer than a normal one, that is a real clue something else might be going on. Trust that feeling and get checked.
Who Is Most at Risk?
Anyone can get cyclosporiasis if they eat or drink something contaminated. But some groups face a higher chance of a longer or more severe illness:
- People with weakened immune systems
- Older adults
- Young children
- People who are already in poor health
People can also get infected more than once, even in the same season, since having it once does not make you immune.
How Is Cyclosporiasis Diagnosed?
This part is important, and many people do not know it: cyclosporiasis is not part of a standard stool test. If your doctor does not specifically ask for it, the lab may not check for it at all.
Here is what usually happens:
- Your healthcare provider collects a stool sample.
- They must specifically request testing for Cyclospora, since it needs special lab methods.
- Because the parasite can be hard to catch on a single test, you may need to give more than one sample, on different days.
If you have had ongoing, unexplained diarrhea, especially during summer months, it is worth telling your doctor and asking directly about Cyclospora testing.
Treatment: What to Know
This section is for general awareness only. It is not medical advice. Please talk to a doctor for anything about your own health.
According to the CDC, cyclosporiasis is generally treated with a combination antibiotic. People with a sulfa drug allergy should talk to their doctor about other options, since the usual treatment contains a sulfa medicine (CDC).
A few general points from official health sources:
- Most people with healthy immune systems eventually recover, even without treatment.
- Staying hydrated is important, especially with frequent diarrhea.
- Do not stop or change any prescribed medicine on your own. Always follow your doctor's advice and complete the treatment they recommend.
- If you are diagnosed, your local health department may also want to know, since cyclosporiasis is a reportable disease in most US states.
Never guess your own treatment for this illness. Because it looks like ordinary food poisoning at first, people often wait too long before seeing a doctor.
How to Protect Yourself: Simple Prevention Steps
There is no vaccine for Cyclospora. The CDC says the best defence is simply avoiding contaminated food and water. Here are practical steps you can take at home, based on CDC and FDA guidance:
- Wash your hands with soap and water before and after handling raw fruits and vegetables.
- Rinse produce under running water before eating, cutting, or cooking it — though remember, this may reduce but does not fully guarantee removal of this specific parasite.
- Follow food recall alerts from your local or national health authority.
- Be careful with untreated water, especially if you are travelling to regions where Cyclospora is more common.
- Practice safe food storage, keeping raw produce separate from cooked or ready-to-eat food.
- Stay updated on official outbreak pages from the CDC and FDA, since new details are added as investigations continue.
Frequently Asked Questions
Is Cyclospora dangerous? For most healthy people, it is unpleasant but not usually life-threatening. It can, however, cause weeks of illness if untreated, and it can be more serious for people with weak immune systems.
Can I catch it from another person? No. Person-to-person spread is highly unlikely. It spreads through contaminated food or water.
Is there a recall right now? As of this writing, no official food recall has been announced for this outbreak. Investigations into specific food sources are still ongoing.
Should I stop eating fresh produce? No health authority is telling people to avoid fresh fruits and vegetables altogether. Instead, follow normal food safety steps and stay alert to any official recall notices.
Conclusion
Cyclospora is a small parasite causing a very real, very uncomfortable outbreak across the United States in 2026. Case numbers are still climbing in several states, and health officials have not yet pinned down one single cause. The most important thing you can do right now is simple: know the symptoms, practice good food safety habits, and see a doctor if you have diarrhea that will not go away.
Health situations like this can change quickly, so always check the CDC's official cyclosporiasis page for the newest updates before making any decisions. Stay safe, stay informed, and take care of yourself and your family this summer.
Thanks for reading this guide on BeInfora. Keep checking back for more simple, honest health updates — Learn, Grow & Stay Informed.
Disclaimer: This article is for general health awareness only. It is not medical advice and should not replace guidance from a qualified doctor. Do not stop or change any prescribed medicine without talking to your healthcare provider. Case numbers and outbreak details can change quickly; always confirm the latest information on the official CDC (cdc.gov) and FDA (fda.gov) websites.
