Explosive Diarrhea Cases In Ohio Rise As Cyclosporiasis Parasite Spreads Across Dozens Of Counties
AND Editorial Team
Ohio is seeing a sharp rise in cyclosporiasis cases. The illness comes from the Cyclospora parasite. It can cause watery and sometimes explosive diarrhea.
Local health reports say the Ohio Department of Health has reported 177 cyclosporiasis cases in 43 counties so far in 2026. Most of those cases appear in June. Local reports also say many cases start after June 20.
This timing matters. Cyclosporiasis often rises in spring and summer. People eat more fresh produce during this season. Past U.S. outbreaks have linked the parasite to fresh items like basil, cilantro, raspberries, lettuce and other produce.
Cyclosporiasis is a stomach and intestinal illness. It comes from the parasite Cyclospora cayetanensis. People get sick when they eat food or drink water that contains the parasite. The CDC says Cyclospora spreads when food or water gets contaminated with feces. The illness does not usually spread directly from one person to another.
This is an important point for families. If one person in a house gets sick, others do not automatically catch it from normal contact. But shared meals can still matter if several people eat the same contaminated food.
The numbers can look confusing because different reports cover different dates. The CDC reports 145 domestically acquired cyclosporiasis cases across 17 states for people who became sick from May 1 through June 16. Those cases include people who ate food in the United States and did not report recent travel.
Newer local and state reports show larger numbers after that CDC cutoff. Wood County’s local report says Ohio has 177 cases across 43 counties so far in 2026. It also says more than 400 people across 18 states have been infected as of Thursday.
This is the unique detail many quick articles miss. The outbreak story changes by date. Older national numbers can look lower because they stop earlier. Newer local numbers can rise fast as labs and health departments confirm more cases.
This illness can feel different from a normal stomach bug. The CDC says symptoms usually start about one week after exposure. But they can start from two days to two weeks or more after infection.
The FDA says Cyclospora can cause watery diarrhea with frequent and sometimes explosive bowel movements. It can also cause appetite loss, weight loss, stomach cramps, bloating, gas, nausea and fatigue.
That long delay creates a real problem. A person may get sick today but may need to remember what they ate one or two weeks ago. That makes source tracing hard for health workers.
Health officials have not confirmed one specific product as the source. The CDC says public health officials are investigating several clusters across multiple states. It also says there is no evidence of one single multistate Cyclospora outbreak linking all cases.
This is one of the most important reader points. No one should blame one restaurant, one grocery store or one produce item without proof.
The source can be hard to find because people eat many fresh foods in summer. They may eat salads, herbs, berries and vegetables from different stores and restaurants. They may also forget small ingredients like cilantro or lettuce that appear inside meals.
The Ohio outbreak does not sit alone. Michigan health officials also report a large cyclosporiasis outbreak. Michigan says more than 170 cases appear across several counties in only nine days. The state also says Michigan usually identifies around 50 cases per year.
This matters for Ohio because many communities sit near the Michigan border. People travel between Toledo, Monroe County and other nearby areas for work, shopping, school and family visits.
Local health officials in northwest Ohio and southeast Michigan say they share information because people move across the border often.
Northwest Ohio appears as one of the key areas to watch. Local reports say Lucas County records about 65 cases. Wood County also reports more than 20 confirmed cases. Health officials say the numbers can change as more reports arrive.
These county numbers matter because they show where public health teams may focus interviews and food history checks.
The practical lesson is simple. If several people in one area get the same rare illness at the same time, investigators look for common foods, restaurants, events or suppliers.
Cyclospora creates a frustrating food safety problem. You cannot see it on produce. You cannot smell it. You cannot taste it.
Stony Brook Medicine says the parasite is microscopic and can only be detected under a microscope. That makes it hard for normal shoppers to avoid by sight.
This point helps real readers. A tomato, berry or herb may look fresh and clean. That does not guarantee it is safe if contamination already happened before it reached the kitchen.
Health officials still tell people to wash fresh produce. The CDC advises people to follow food safety steps and avoid food or water that may be contaminated. It also says food handling and safe storage matter.
But the FDA adds a harder truth. It says rinsing or washing food is not likely to remove Cyclospora completely. This is a high-value point for readers. Washing produce is still smart. It can reduce dirt and some germs. But it does not make every high-risk product fully safe during an outbreak.
Many people may think they have food poisoning and wait it out. That can delay diagnosis.
The CDC says doctors diagnose cyclosporiasis by testing a stool sample. It also says labs may need special tests because routine stool testing may not detect Cyclospora. Patients may need to submit several stool samples on different days.
This is a key practical point. If diarrhea lasts for days or returns after improving, people should ask a health provider about Cyclospora testing. They should not assume every stomach illness uses the same test.
Cyclosporiasis can be treated. The CDC says the treatment is trimethoprim-sulfamethoxazole, sold under names like Bactrim, Septra or Cotrim. It also says people with sulfa allergies should ask a health provider about other options.
This does not mean people should self-medicate. A doctor needs to confirm the illness and choose the right treatment.
Hydration also matters. Diarrhea can cause fluid loss. Older adults, young children and people with weak immune systems may face higher risk from dehydration.
People should call a doctor if diarrhea is sudden, severe or long-lasting. They should also seek care if they have blood in stool, fever, severe cramps, dizziness, dry mouth, low urine or signs of dehydration.
Michigan health officials advise people to contact a health care provider if they have sudden and ongoing diarrhea. They also tell people to contact their local health department if more family members have similar symptoms. This advice helps because cyclosporiasis can come in waves. Symptoms may ease and then return.
The phrase “explosive diarrhea” spreads online because it sounds shocking.
But the phrase also describes a real symptom. The FDA uses similar language and says Cyclospora can cause frequent and sometimes explosive bowel movements. Still, the headline can make the story sound like a joke. That can hide the real issue.
For many patients, the illness means days or weeks of bathroom trips, fatigue, stomach pain and missed work. Some people need hospital care. CDC-linked reports say at least 20 people with available information were hospitalized in the multistate investigation.
Cyclospora is often linked with tropical and subtropical regions. But the CDC says the current reported cases involve people who became sick after eating food in the United States. They did not report travel during the 14 days before illness.
This changes how readers should think about risk. A person does not need to travel abroad to get cyclosporiasis during a domestic outbreak. Food supply chains can move produce across many states. That makes a local illness part of a bigger food safety problem.
Restaurants and food service workers also play a key role. The FDA says restaurants and retailers should follow safe food handling practices. They should wash and sanitize utensils, surfaces, cutting boards and storage areas. They should also wash hands after cleaning and sanitation steps.
This matters because one contaminated ingredient can touch many meals. Restaurants may not know the source yet. But they can still reduce risk by tightening basic food safety steps.
Ohio residents can take simple steps now. They should wash hands before preparing food. They should rinse produce under running water. They should keep raw and ready-to-eat foods separate. They should clean cutting boards and counters after food prep.
They should also watch symptoms after eating fresh produce, especially salads, herbs and berries. These steps do not remove all risk. But they reduce everyday exposure and help families respond faster if symptoms appear.
The Ohio cyclosporiasis rise is not a reason to panic. It is a reason to pay attention.
The most useful action is not guessing the source. The most useful action is tracking symptoms, calling a doctor when diarrhea lasts, asking about the right stool test and reporting confirmed illness to local health officials.
This helps public health teams find patterns faster. The outbreak also shows why food safety is not only about cooking meat. Fresh produce can carry risk too, especially when contamination happens before it reaches the store or kitchen.
Health officials will keep interviewing sick people. They will ask what patients ate before symptoms started. They will compare answers across counties and states.
The CDC, FDA and local health departments will keep looking for clusters. They may identify a food item later. They may also find several sources instead of one. For now, Ohio residents should focus on symptoms, hydration, proper testing and safe food handling.
The main message is clear. Cyclosporiasis can be miserable, but it is treatable. The faster people recognize it, the easier it becomes for doctors and health departments to respond.
