Understanding the Big Tummy Bug Outbreak: Cyclospora in Michigan and Ohio

What’s Going On? A Sickening Mystery

Imagine a tiny invisible creature (called a parasite – a germ that lives inside you and makes you sick) named Cyclospora is causing lots of people to have really bad diarrhea. This is happening mostly in two US states: Michigan and Ohio.

• More than 3,000 people total in Michigan and Ohio have gotten sick.
• Michigan reported 2,640 cases as of Monday morning (9:30 a.m.), and 44 of those people had to go to the hospital.
• Ohio has reported 361 cases since June 1, and at least 46 people there have been hospitalized. (Note: A previous version of the news story had the wrong Ohio number, but this is the fixed count.)
• By July 10, 31 states told the CDC (the national health-detective agency) they had cases too, but we don’t know if all are part of the same problem. The CDC says many states saw more sickness in the last two weeks compared to the same time in 2025. The CDC’s own count (843 confirmed since May 1) is lower because they are still checking the states’ numbers.

Health detectives think the bug might be coming from lettuce or salad greens, because early clues show many sick people ate lettuce. Dr. Natasha Bagdasarian, Michigan’s top doctor, said lettuce keeps coming up in the investigation. But they haven’t found a specific farm, brand, or supplier, and they can’t rule out other foods yet.

Important Point: No nationwide recall of any food has been ordered. Some restaurants have voluntarily taken fresh greens off their menus just to be safe.

Why Is It So Hard to Find the Culprit?

Finding out which food made everyone sick is like solving a puzzle with missing pieces. Here’s why:

• Slow counting: The bug usually takes about a week to a few weeks to make you sick after you eat it, and then it takes more time to get test results.
• Memory game: Sick people must remember what they ate weeks ago – that’s tough!
• Tricky bug “instruction book” (DNA): Usually, scientists can read a germ’s DNA to match sick people to the same food. For this bug, the book is super complicated (like a giant novel vs a kids’ book).
• Fewer helpers: In 2025, some public health offices lost staff and money. A system called FoodNet (a team of CDC, USDA, FDA, and 10 state labs that actively calls labs to find food sickness) used to track 8 germs including cyclospora before July 1, 2025. Now it only tracks 2 simple bacteria (salmonella and a bad type of E. coli). The others are optional. Cyclospora is still reported through other systems, but the US watching power isn’t as strong.
• A former CDC director, Dr. Robert Redfield, said cutting these programs is not good because “surveillance [watching for sickness] is the key to early identification.”

The US Health Department (HHS) says cases usually go up in summer. They say CDC and FDA are working with states. A spokesperson, Emily Hilliard, said CDC still collects cyclospora data through other systems, and states get about $33 million each year for food-sickness work – that money didn’t change.

How Do Germ Detectives Usually Catch Food Bugs?

Normally, for simple bacteria like E. coli or salmonella:

1. Scientists read the bacteria’s DNA (like reading a very simple children’s book).
2. A national network called PulseNet constantly checks these DNA fingerprints from sick people.
3. If many people in different places have the same fingerprint, they know to look for a common food.

But for cyclospora, the DNA is like reading “War and Peace” – a huge, complex book. A microbe expert, Jennifer McEntire, says it’s not the same as bacteria; the letters are there but it’s way harder to track.

How Do People Catch This Bug and What Does It Do?

• How you get it: You usually eat or drink something contaminated (like fresh veggies or pool water) weeks before you feel sick. It does not usually spread from person to person. Michigan says there’s no proof that swimming pools caused this outbreak.
• Symptoms: Watery diarrhea, belly cramps, and bloating that can last for weeks. If you lose too much water (dehydration), you might need hospital care.
• Treatment: Doctors give a 7–10 day course of a combo antibiotic (called sulfamethoxazole-trimethoprim, sold as Bactrim or Septra).
• Why we miss cases: Some people are embarrassed to see a doctor for diarrhea, or they wait at home. Also, the bug only shows up sometimes in poop tests, so you might need multiple tests, and not all standard stomach tests look for it. Cyclosporiasis is a “nationally notifiable disease,” meaning confirmed cases must be reported to state and then CDC.

Important Point: By the time someone is counted as a “confirmed case,” weeks have passed since they ate the bad food, making the trail cold.

What Are the Detectives Doing Now?

• Michigan is interviewing every confirmed sick person (over 2,600 of them!). They’ve finished more than 1,000 interviews.
• They also check receipts, restaurant orders, and shopper cards to see exactly what people bought. Dr. Bagdasarian said this is a huge amount of work: “You can just imagine the sheer amount of effort and work that goes into this.”
• Over the July 4 holiday, they sent out tips to anyone handling food at home or in restaurants.
• Some restaurants voluntarily pulled certain fresh ingredients; those steps are voluntary.
• No specific food is confirmed yet, but they are seeing “early signals.”

How Can You Stay Safe? (Easy Steps)

To lower your risk of meeting this bug, follow these simple steps:

1. Wash all fruits and vegetables really well with water.
2. Cook veggies and fruits if you can (heat kills the bug).
3. Buy whole heads of lettuce instead of the pre-washed bags.
4. Throw away the outer leaves, and wash the inner leaves again at home.
5. Keep clean when preparing food – wash hands and surfaces.

Michigan health officials specifically recommend the whole-head lettuce tip.

Summary

A tiny parasite called cyclospora has made over 3,000 people in Michigan and Ohio sick with long-lasting diarrhea. Lettuce is a suspected source, but the exact food hasn’t been found. Finding the cause is slow because the bug hides in tests, people forget what they ate, and some health tracking systems were reduced in 2025. Doctors can treat it with antibiotics, and you can protect yourself by washing and cooking produce. Health teams are working hard, interviewing thousands and checking receipts, but it will take time.

FAQ (Frequently Asked Questions)

1. What exactly is cyclospora?
It’s a microscopic parasite (a living thing too small to see without a microscope) that gets into your intestines and causes diarrhea, cramps, and bloating. You get ill by eating or drinking something that contains it.

2. Why do they think lettuce is the problem?
Because in early investigation, many sick people reported eating lettuce or salad greens. But it’s not proven yet, and other foods could be involved. No specific type, grower, or supplier is identified.

3. Can I catch it from my friend who is sick?
Usually no. It doesn’t spread directly person-to-person. You get it from contaminated food or water, not from hugging or sharing a room.

4. Should I stop eating all salads?
Not necessarily. You can still eat greens if you follow the safety steps: buy whole heads, wash well, discard outer leaves, or cook them. No nationwide recall is in effect.

5. How do they count cases if it’s so hard?
Doctors report confirmed lab tests to the state, who tell the CDC. But because testing is tricky and people delay seeing doctors, the true number is likely higher than reported. The CDC continues to collect cyclospora data through systems other than FoodNet.