Cyclosporiasis Outbreak 2026: Parasitic Illness Spreading Across the US

Parasitic Illness Spreading Across US — Here's What You Need to Know

Atlanta, GA – July 3, 2026 — There's a parasite making its way through the country, folks, and it's not subtle about it. The CDC is tracking an outbreak of cyclosporiasis — a nasty intestinal infection caused by the Cyclospora cayetanensis parasite — and the numbers are climbing fast.

At least 145 people across 16 states have been sickened since May 1, with 20 hospitalizations already on the books. And that was before Michigan reported a jaw-dropping surge of more than 228 cases in just nine days. We are talking about a gastrointestinal illness that causes explosive diarrhea, stomach cramps that'll double you over, and fatigue that leaves you wiped out for weeks.

This is not a drill. Let's break it down.

(Global 1 News)

What Is Cyclosporiasis and Why Should You Care?

Cyclosporiasis is caused by a microscopic parasite called Cyclospora cayetanensis. You don't catch it from another person — you get it by ingesting contaminated food or water. Think imported fresh produce: raspberries, basil, cilantro, lettuce, snow peas. That's the typical vector in past outbreaks.

The incubation period is about a week. You eat something contaminated on a Tuesday, and by the following Monday or Tuesday, you are in trouble. The hallmark symptom? Frequent, watery — and yes, sometimes explosive — diarrhea. But that's just the headline. Add stomach cramps, bloating, nausea, fatigue, and a low-grade fever to the picture. Some folks have described it as the worst stomach bug of their lives, and it can linger for weeks if untreated.

Here's the scary part: the infection doesn't always clear up on its own. Without treatment, symptoms can drag on for weeks or even months, with periods of relapse. The good news? It's treatable. A course of antibiotics called trimethoprim-sulfamethoxazole (TMP-SMX) knocks it out. But you have to know you have it first — and that means getting tested.

Where the Outbreak Stands Right Now

The CDC's latest surveillance data, current through June 16, shows 145 domestically acquired cases — meaning none of these people had traveled outside the US in the two weeks before getting sick. They caught it right here, from food eaten on American soil.

Nationally, New York has reported the highest number of cases, followed by Illinois and Texas. The infected range in age from 5 to 86 years old, which tells you this bug doesn't discriminate. It'll hit a kindergartener and a grandparent with equal ferocity.

But the real explosion is happening in the Great Lakes region. Michigan health officials reported 228 cases in 21 counties between June 22 and June 30 — and they expect that number to grow. Monroe County alone has 92 cases. Lenawee County has 36. Washtenaw, 28. Wayne County, 17. Even the city of Detroit is in the mix.

We're talking about people ages 8 to 84 getting hit, and the Michigan Department of Health and Human Services has made clear: these numbers are expected to climb.

Ohio, right next door, is now on alert. The Buckeye State hasn't reported numbers anywhere near Michigan's yet, but proximity plus the fact that the source hasn't been identified means health officials there are bracing.

The Big Question: What's Causing It?

Here's the part that should concern you most: the CDC does not know the source yet.

In past cyclosporiasis outbreaks — and there have been many, because this parasite shows up like clockwork between May and August every year — investigators eventually trace it back to a specific produce item. Raspberries from Guatemala. Cilantro from Mexico. Basil from somewhere warm. But this year? They're still looking.

The Michigan outbreak is particularly puzzling. The state saw 228 cases explode in nine days across 21 counties, which suggests a widely distributed food item — something sold in grocery stores across the region. Health officials are interviewing patients, asking what they ate in the week before symptoms started, trying to find the common thread.

Lynn Sutfin, spokesperson for MDHHS, told reporters the department is working closely with the CDC and local health departments to identify the vehicle of transmission. But so far, no single source has been identified.

That means it could still be on store shelves.

16 States and Counting

Let's talk about the map. The CDC tracks cyclosporiasis cases based on where they were contracted, not just where they were reported. As of mid-June, the affected states include: Alabama, Connecticut, Florida, Georgia, Illinois, Iowa, Massachusetts, Michigan, Minnesota, New Hampshire, New York, North Dakota, Ohio, Texas, Virginia, and Wisconsin.

And that's just the confirmed, tested, reported cases. Public health experts will tell you the actual number is almost certainly higher, because not everyone with diarrhea goes to the doctor. Not everyone who goes to the doctor gets tested for cyclospora specifically.

If you had a nasty stomach bug in May or June that lasted more than a few days, it's worth asking your doctor whether it might have been cyclosporiasis. The symptoms are easily mistaken for viral gastroenteritis or food poisoning, and most primary care docs don't test for cyclospora unless you specifically ask or mention a known outbreak.

What the CDC Says — and What You Can Do

The CDC's official guidance is straightforward: if you have watery diarrhea that lasts more than three days, see a healthcare provider and ask about cyclosporiasis testing. Specifically request a stool test for ova and parasites — that's the test that catches Cyclospora.

Treatment with TMP-SMX (Bactrim, Septra) is highly effective. Most people start feeling better within days of starting the antibiotics. But if you're allergic to sulfa drugs, there are alternatives — talk to your doctor.

Prevention is trickier because the source isn't known. But here's the playbook for now:

Wash your produce thoroughly. Scrub firm fruits and vegetables under running water. Cyclospora is tough — it can survive on produce surfaces. Even if you buy pre-washed bagged salads, rinse them again.

Cook where you can. Heat kills Cyclospora. If you're worried, cook your vegetables. Thoroughly.

Practice good hand hygiene. Wash your hands before eating, after using the bathroom, and after handling raw produce. This won't prevent cyclosporiasis from contaminated food (the parasite has to be ingested), but it prevents secondary issues and other infections.

Stay informed. The CDC updates its cyclosporiasis page regularly. Watch for recalls. If investigators identify a contaminated product, you want to know about it within hours, not days.

Historical Context: This Pattern Is Familiar

Cyclosporiasis outbreaks are not new. In 2018, there was a massive outbreak linked to McDonald's salads that sickened more than 500 people across 15 states. In 2020, a cilantro-linked outbreak hit the Midwest. The pattern is always the same: late spring to early summer, contaminated fresh produce, cases clustered in states that import certain fruits and vegetables.

What's different this year is the speed and concentration of the Michigan surge. Ninety-two cases in a single county — Monroe — in just over a week. That's aggressive spread, and it suggests a heavily distributed product.

The other concern is underreporting. The CDC's confirmed count of 145 cases as of June 16 is a snapshot, not the full picture. By the time you add Michigan's surge — which happened after that June 16 cutoff — plus cases in other states that may have been contracted in late June, we could be looking at 400-plus cases nationally right now. And that's a conservative estimate.

What This Means for You, Folks

Look, I'm not here to scare you. I'm here to arm you with information. The cyclosporiasis outbreak is real, it's spreading, and the source is still unknown. But the tools to deal with it are straightforward: know the symptoms, get tested if you have them, and treat it promptly.

This is the kind of story where being informed makes a real difference. If you know what cyclosporiasis looks like, you're more likely to catch it early and get treated before it knocks you out for weeks. And if you're watching what you eat a little more carefully these next few weeks? That's just good sense.

The CDC is investigating. State health departments are interviewing patients. Grocery stores are — presumably — paying attention. But until a source is identified, the best defense is a good offense: wash your produce, pay attention to what your body is telling you, and don't ignore persistent diarrhea.

The Bottom Line

Cyclosporiasis is here. It's in at least 16 states, and Michigan's numbers are exploding. The CDC says 145 confirmed cases — we know the real number is higher. The source is unknown, the peak season has just begun, and the best thing you can do is stay informed, stay vigilant, and see a doctor if something feels off.

This is Jessica Ali for Global 1 News, telling you straight: don't let this one slide under the radar. Share this story with someone who needs to know. Wash your produce. And if you've had a stomach bug that just won't quit — get tested.

Stay safe. Stay sharp. I'll keep watching this one.

By Jessica Ali, Lead Anchor — Global 1 News