Do I Need a Parasite Cleanse For This Cyclospora Thing?!

Explosive diarrhea…Parasite…Anybody else’s stomach feeling upset right now? Just hearing about GI issues, makes me feel all squiggly! 

Those are the words showing up in headlines about summer stomach bugs right now, and if you saw them and thought, “Wait, what is this?” that’s fair.

This summer, Cyclospora has been showing up more in the news, and I’ve heard from a lot of parents asking:

So let’s talk about what cyclospora is, what we know right now, what is still unclear, and when lingering diarrhea is worth a call to your pediatrician.

What cyclospora actually is

When parents hear "parasite," it can sound instantly alarming. Cyclospora (or Cyclospora cayetanensis) is microscopic, and when it contaminates food or water, it can cause an intestinal infection called cyclosporiasis.

The spread is fecal-oral, which means human waste ends up in water used to grow or wash crops, often through gaps in sanitation or irrigation practices. I know, gag, how does human waste even end up anywhere near our produce? It usually comes down to sanitation gaps somewhere along the growing process, things like irrigation water sourced too close to areas without proper sewage treatment, or wash water that gets reused or isn't clean to begin with. Cyclospora only infects humans, so there is no animal source here, it traces back to human waste somewhere along the farm to table chain.

One common mix-up: the parasite does not grow or multiply once it is out in soil or water. It cannot reproduce outside a person. What actually happens is it matures over about one to two weeks into a form that can make someone sick, wherever it happens to land, whether that is soil, irrigation water, or wash water, as long as conditions are warm and moist enough. Water tends to be the bigger player in actual outbreaks, though, since contaminated irrigation or wash water can spread it across a whole batch of produce rather than staying in one isolated spot. This is why direct person-to-person spread is uncommon. Not pleasant to think about, I know. 

We tend to hear about fresh produce with Cyclospora because fruits, vegetables, and herbs can be exposed to contaminated water before they ever get to the grocery store or your kitchen. And because many of those foods are eaten raw, there is not always a cooking step to kill the parasite.

One important difference from something like norovirus is that Cyclospora usually is not easily spread from person to person. So this usually behaves less like one kid brings it home and the whole house gets it overnight, and more like a group of people being exposed through the same contaminated food or water source.

And this is where the “explosive diarrhea” headlines come from.

Cyclospora can cause frequent, watery diarrhea that feels urgent and can last longer than the typical stomach bug. Kids (and yourself)  may also have stomach cramps, bloating, gas, nausea, appetite changes, fatigue, body aches, or a low-grade fever. But, the watery diarrhea is a red flag to consider getting tested. 

For children, the biggest concern with watery diarrhea is dehydration. The younger the child, the faster that can happen, especially if they are not drinking well, peeing less, having fewer wet diapers, acting unusually tired, or also vomiting.

The other clue is the pattern. Symptoms can seem to get better and then come back again. So if a “stomach bug with explosive diarrhea” is dragging on, coming in waves, or not following the usual 24-to-72-hour course, that is when I’d want parents to check in with their pediatrician.

What we know about the numbers right now

Here’s where this can get confusing. The CDC has a national surveillance page for cyclosporiasis, but it is not always the most up-to-date place to see what is happening in a specific state. As of now, estimates show 2,000 cases nationwide so 0.00058% of the population. This does not mean we should not care, but I need us to put this into perspective to avoid panic. Reduce risk but do not spiral.  As of mid-June, the CDC listed 145 U.S.-acquired cases across 17 states, with 20 hospitalizations and no deaths.

But state numbers are moving faster.

Michigan is the clearest hotspot right now. As of July 9, the state had 1,251 cases connected to its current outbreak. Cyclosporiasis is not new, and cases happen every year, but this is a much larger outbreak than Michigan typically sees. The MDHHS is updating the cyclosporiasis outbreak webpage daily.

Other states showing up in current reporting include New York, Illinois, and Texas, with Florida, Colorado, North Carolina, Pennsylvania, Virginia, Wisconsin, and several others also reporting cases.

So if you’re trying to understand what is happening where you live, I’d check your state health department for the most up-to-date local information.

The main takeaway: cases are rising in some areas, Michigan is seeing the sharpest outbreak right now.

But Why Certain States? 

This is the part that confuses a lot of parents, so let's slow down on it. Outbreaks like this one usually are not random. They tend to follow the supply chain.

Fresh produce, especially berries, herbs, and leafy greens, often gets grown in one region and then shipped out to grocery stores across many states. So if contaminated water touched a crop at the farm level, that same batch can end up on shelves in Michigan, New York, Texas, and a handful of other states, all at roughly the same time. That is why you are seeing multiple states pop up in this outbreak instead of just one.

It also explains why some states are hit harder than others. States that receive more shipments from the region in question, or that got a bigger batch of the contaminated product, are going to show more cases. It is less about something in that state's water or soil, and more about which grocery stores and restaurants happened to get that particular shipment.

Why can’t we track where this is coming from? 

Short answer: they are trying, and it takes time.

This is probably the most frustrating part for parents. When a foodborne illness is in the headlines, the first thing most of us want to know is, “Okay, what food do I need to avoid?”

Public health investigators use something called a case-control study. They interview sick people about everything they ate in the week or two before getting sick, then compare that to what a group of healthy people ate. If enough sick people all mention the same berry, herb, or salad mix, that becomes the lead that the investigators chase down.

The tricky part is that fresh produce moves fast and gets mixed together. A container of basil or a clamshell of raspberries might combine product from several farms before it is packaged. By the time someone is sick enough to call their doctor, remembers what they ate, and that gets reported to a health department, the product itself may already be gone from shelves and even out of people's homes. That lag is exactly why we do not have one confirmed source yet, even though investigators are actively working backward through the supply chain right now.

And here is the harder truth: this is also happening after a cut to required foodborne illness tracking.

FoodNet, a CDC-linked surveillance system, has tracked several major foodborne pathogens, including Cyclospora. But starting with data collected on or after July 1, 2025, reporting to FoodNet became optional for most of those pathogens. Salmonella and certain E. coli infections are still required, but Cyclospora is not.

State health departments can still investigate outbreaks, and Cyclospora is still reported through other public health systems. But when required active surveillance gets narrowed, the picture can become less complete. And for parents, that may mean more of this uncomfortable middle place: cases are rising, the source is not confirmed, and the advice is less specific than we all wish it were.

What Produce Has Been Involved

Cyclospora outbreaks in past years have most often been tied to a few repeat categories and according to the largest outbreak in Michigan, the risk warnings sound similar. 

• Fresh herbs, especially cilantro and basil

• Berries, especially raspberries and blackberries

• Prepackaged salad mixes and bagged greens

What these foods have in common:

• Usually eaten raw, no cooking step to kill anything

• Can be exposed to irrigation water during growing

• Often handled by hand during harvesting and packing

For this specific outbreak, health officials have not named one confirmed product yet, so I am not going to hand you a list and say avoid this exact item, because that would be getting ahead of the actual data. The categories worth being a little more mindful of right now are fresh herbs, berries, and pre washed bagged greens or salad kits, simply because those are the categories most often linked to Cyclospora historically.

Why these foods keep showing up:

• Cyclospora is a parasite, not a bacteria. It does not grow or multiply on food, it just rides along until someone eats it.

• It gets onto produce through contaminated water, most often irrigation, or through contact during harvesting and handling.

• Texture matters a lot. A cilantro leaf has folds, and a raspberry is hollow with dozens of tiny bumps, so water can settle into spots a quick rinse never reaches.

• Smooth, solid produce like a blueberry or a cucumber gives water and dirt nowhere to hide, so it rinses clean much more reliably.

The honest, no fear mongering version: we are watching a few categories more closely right now because history points that direction, not because any single product has been confirmed as the source. If officials do name something specific, that will come from traceback data, not guesswork, and I will pass it along the moment it is real.

Does Washing Produce Actually Help?

Here is the honest, slightly less comforting truth. Washing produce is still a good habit for general food safety, but it is not going to reliably protect you from Cyclospora specifically.

Cyclospora spreads through a hardy structure called an oocyst, which is basically the parasite's version of an egg. These oocysts can cling tightly to the surface of produce, especially anything with a rough or porous texture like raspberries or leafy herbs, and rinsing under water does not reliably knock them loose. Unlike a lot of surface bacteria, this is not something soap, produce wash, or a good scrub is going to solve.

So I want to be direct with you here instead of giving you a false sense of control. Washing produce is worth doing because it helps with other germs and residue, but it is not a shield against Cyclospora if contamination happened before the food reached your kitchen. The one step that actually kills the parasite is heat, so cooking produce when possible is more protective than washing it raw.

With that said, here is what I would still do, since good habits stack even when none of them is perfect on their own. Some of you may read this and think, "I'll take my chances," and that comes down to your own comfort with risk. I'm simply offering the things we can do to reduce risk as much as possible:

• Wash your hands with soap and water before and after handling produce.

• Rinse fruits and vegetables under running water before eating, cutting, or cooking. If something is labeled "prewashed," you do not need to wash it again at home.

• Scrub firm produce, like cucumbers or melons, with a clean produce brush before you peel it, not after. Washing first keeps whatever is on the skin from getting dragged into the flesh by your knife or peeler.

• Peel or skin fruits and vegetables when possible, after washing. This removes a layer where contamination often sits, though it will not help with berries, greens, or herbs that cannot be peeled.

• Cut away any bruised or damaged spots before eating.

• Refrigerate cut, peeled, or cooked produce within about two hours.

• When you can, cook it. This is the one step that actually kills the parasite, so it matters more than any washing step above.

This is also why produce with a thick, inedible skin, like bananas, mangoes, pomegranates, avocados, melons, and citrus, along with peeled veggies like cucumbers, potatoes, and carrots, tends to run a lower risk. The edible part stays shielded the whole time. Produce with no peel to remove, like lettuce, spinach, celery, herbs, and berries, does not have that built in protection, so washing only does so much, and cooking becomes the more reliable option for those.

If you live somewhere with a current local outbreak, check your state health department for updates. If a specific food, brand, restaurant, or supplier gets identified, that local guidance is what I would follow.

And if you are in Michigan right now, MDHHS has recommended extra caution with raw produce because the source still has not been identified. Their guidance includes careful washing and choosing cooked produce when possible, since enough heat can kill Cyclospora.

For most families, I wouldn’t turn this into fear around fruits and vegetables. Kids eating produce is still a good thing. But this is a time to be more mindful with raw produce, especially if you live in an area with rising cases or have a child who is more vulnerable to dehydration or complications.

Symptoms, Timing, and when to get tested 

Most stomach bugs are still going to be the usual suspects: a virus from daycare, something picked up while traveling, or a random GI bug that moves through the house and ruins everyone’s week.

Symptoms for cyclospora typically show up about a week after eating contaminated food, though it can range from a few days to over a week. That gap is part of what makes this frustrating for families. Your child could seem totally fine for days after eating the food that caused it, then suddenly develop symptoms, and by then most people have no idea which meal to even suspect. I say this not to worry you, but so you are not caught off guard trying to solve a mystery that even public health teams have a hard time solving.

What to watch for:

• Frequent, watery diarrhea that feels urgent and drags on longer than a typical stomach bug. This is the cardinal sign, meaning it is the symptom that should catch your attention the most.

• Stomach cramps, bloating, or gas.

• Nausea, and sometimes vomiting. Vomiting can happen here, usually from the bloating and general stomach upset, but it is not the main feature. Explosive diarrhea is the one to pay attention to.

• Appetite changes and fatigue.

• Body aches or a low-grade fever.

• A pattern of seeming to get better, then relapsing again a few days later. This back and forth is a clue that shows up a lot with Cyclospora.

See a clinician if any of the following is occurring:

• Watery, explosive diarrhea has lasted more than 3 days and is not improving, or it improves and then comes back.

• You or your child ate produce, especially herbs, berries, or bagged salad, in an area with known local cases, or traveled somewhere with an active outbreak and are now having symptoms.

• Diarrhea in general is dragging on for more than a week.

• Stomach bloating, diarrhea, and loss of appetite are happening together, or dehydration is a concern.

• There is blood in the stool.

•  Your child cannot keep fluids down.

• A fever is persistent more than 3 days with symptoms

• Your child is very young, immunocompromised, or has a medical condition that makes dehydration riskier.

If none of those apply and it is a garden variety few days of stomach bug that is already improving, you likely do not need to push for Cyclospora testing specifically. But the longer it drags on without improvement, especially past the one week mark, the stronger the case for asking your clinician to specifically test for it, since it is not always caught on a standard stool panel.

What Test Is Actually Done, and When It Makes Sense

If your or your child needs testing, a specific stool test for Cyclospora is needed. Like this one here. Cyclospora doesn't show up on a regular stool test. So the easiest thing to do is just ask, "Do we specifically need to test for Cyclospora?" instead of assuming a normal stool test will catch it. Your clinician may order this test and a general Ova and Parasite stool test. 

The frustrating thing here is timing. We usually want to see about 3 days of symptoms before testing has much of a chance of coming back positive. And even after that, a negative test does not automatically rule it out.

So if you or your child has symptoms but the test comes back negative, talk to your clinician about whether repeat testing makes sense, or whether antibiotics should be started anyway just in case. Giving antibiotics without a positive test is a very personal call and depends on the situation. I generally do not like prescribing antibiotics "just in case," but if a child is young, immunocompromised, or looking unwell, I may choose to cover for it with antibiotics anyway.

Here is the part I want to be clear on: This test only makes sense when there are symptoms. There is no reason to test a child or yourself who feels totally fine just because there is an outbreak nearby or because they ate berries last week. Testing without symptoms will not tell you anything useful, and it is not something pediatricians recommend as a general precaution. So please, please do not go demanding testing if you are asymptomatic. If anything changes with this recommendation, I will let you know.

Treatment, for Kids and Adults

The good news in all of this is that Cyclospora is treatable. The standard treatment is an antibiotic combination called sulfamethoxazole and trimethoprim, often known by the brand names Bactrim or Septra. This is the go to treatment for both children and adults, with the dose adjusted based on age and weight for kids.

For someone who is allergic to sulfa medications, or in the rare case where treatment does not fully clear symptoms, there are alternative options a clinician can consider, but sulfamethoxazole and trimethoprim is the first line approach for the vast majority of people. Some mild cases can also resolve on their own without treatment, but if your child has a confirmed case or a symptom pattern that fits, this is a conversation to have directly with your pediatrician rather than trying to wait it out.

Untreated Cyclospora usually isn't dangerous, but it can drag on for weeks, sometimes months, often with a pattern of feeling better then relapsing. The main risks are dehydration, weight loss, and fatigue from prolonged diarrhea, worse in immunocompromised people. Serious complications are rare in otherwise healthy kids and adults. Since antibiotics clear it quickly for most people, there's little reason to ride it out.

What About Parasite Cleanses

I get this question every time a parasite makes headlines…Okay, wait–I get this question even when there are NOT parasites in headlines, so let's address it directly. Parasite cleanses, the kind sold online as teas, tinctures, or supplement kits, are not a treatment or prevention for Cyclospora or any confirmed parasitic infection, and they are not something I recommend.

There are a few reasons for this. These products are not regulated the way medications are, so there is no guarantee of what is actually in them or in what dose. There is no solid evidence that they clear Cyclospora or any other parasite from the body. And in kids especially, giving unregulated herbal blends to try to self-treat a suspected infection can delay real diagnosis and real treatment, which is the actual risk here. If you suspect your child has a parasitic infection, the path forward is a stool test and, if needed, a prescribed antibiotic, not a cleanse from the internet.

So, please, for the love of science and not panic-purchasing, don’t fall prey to accounts or people selling “cures” or prevention tips. They are profiting from fear that is NOT evidence-based. 

Why Climate Change Belongs In This Conversation Too

Let me hop on my soapbox for a second. Want to know why we are seeing so much more contamination, foodborne illness, and parasites like this one showing up? One large piece of it is climate change.

Warmer temperatures let bacteria and parasites multiply faster, both in food and in the water used to grow crops. Cyclospora does better in warm, wet conditions, so longer hot seasons and heavier rain give it more chances to contaminate produce and water supplies.

Heavy rain and flooding matter here too. Runoff can carry contaminated water onto farms, especially onto produce that gets eaten raw. As storms and flooding show up more often in a lot of growing regions, contamination events like this one may become more common, not less.

Farming practices, water testing, and public health surveillance still matter a lot, climate is not the only factor. But food safety and climate change are not two separate conversations. They are tangled up together, whether we like it or not.

So please, vote for officials who actually believe in climate change and are willing to work on it. This is one of many reasons why it matters.

What I Am Doing Right Now as a Mom and Pediatrician 

I will be honest about where I personally land on all of this. I do believe in taking precautions, but I also know we cannot control everything, and that is just a hard reality of parenting and of food safety in general.

What gives me some peace is knowing this is treatable and outcomes are good. That does not mean I do not care, it means I wash my produce, and I peel and cook it when I can. But to be fair, my family is still eating fruits and vegetables raw. Is there some risk in that? Yes. But I look at it as a benefit over risk. 

If you have an infant, a child who is immunocompromised, or you would simply feel better leaning into more caution, it is completely reasonable to lean more heavily on cooked vegetables, peeled fruit, and less raw produce for now.

And one more thing worth knowing, because it is understandably frustrating: frozen fruits and vegetables can carry Cyclospora too. This is not only a fresh produce issue. I share that not to take away one more "safe" option, but so you have the full story instead of a false sense of security around the freezer aisle.

Final Thoughts

Headlines with words like "parasite" and "explosive diarrhea" are meant to catch your attention. And in this case, there is something real to understand. Cases are rising in some areas, Michigan is seeing a much larger outbreak, and we still do not have one clear source. That uncertainty is frustrating, especially when fresh produce is such a normal part of feeding our families.

My hope is that this gives you a clearer filter for what matters most right now: follow local updates, keep up with basic produce safety even knowing its limits, know that testing is for symptoms not for peace of mind, skip the cleanses, and know when symptoms are worth a call. This is worth taking seriously, and it is also something families can approach with practical steps instead of panic.

If this helped clear things up for you, share it with another parent who is seeing the same headlines and wondering what is actually going on. I will keep updating this as things change or progress, so you always have a clear, level-headed plan with the information we do have. That's what PedsDocTalk is all about.

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