Parasite Outbreak Explosive Diarrhea: What’s Behind the 2026 US Cases
An explosion of cases of a parasite that causes nasty bouts of explosive diarrhea has health officials in 17 states on high alert this summer. You may have even seen the headlines. If you’ve been feeling unwell after eating salads or smoothie bowls, you’re probably justified in your concern. The CDC has a running tally of 145 cases as of May 1, 2026, and the number is expected to increase. Investigators are working to identify the source of the outbreak. In this article, you will find out the disgusting things this parasite does to your body, what symptoms you need to look out for, and what is really going on.
What Is Causing the 2026 Parasite Outbreak Explosive Diarrhea Cases?
The culprit behind this illness is a microscopic parasite called Cyclospora cayetanensis. This parasite travels on fresh produce and is able to reach your intestines after you consume something that has been contaminated. Because this parasite is so small, it is possible to consume it without even tasting or noticing it. This is why catching it is so difficult. The parasite causes an infection named Cyclosporiasis. This infection is a notifiable disease, which means that once doctors or labs confirm a case, they are required to report it to the CDC and FDA to track cases.
In the summer months, outbreaks in the U.S. have been linked to items such as cilantro, basil, raspberries, snap peas, and bagged salad kits. All of which are packaged, grown, or processed abroad. Thus, overseas shipping. This year, no specific item has been tied to the outbreaks, and it takes time to trace an item, as many people have trouble remembering everything they have eaten, especially if it was two weeks ago.
How Many People Have Gotten Sick From Cyclospora So Far?
As of June 16, 2026, the CDC reported 145 cases, all of which were acquired in the U.S. 20 of the 145 cases led to hospitalizations, and no deaths have been reported. The ages of all the cases ranged from 5 to 86, and the median age was 42. There were 61% female cases. In addition, 45 cases were reported for those who traveled abroad in the two weeks before the onset of illness.
The officials stress this is just the diagnosed cases, and the number of cases is way higher. Many clinical labs will not test for Cyclospora unless the doctor specifically asks for it, so many cases will be undiagnosed or will just be dismissed as a passing stomach illness.
Which States Are Reporting Cyclospora Cases in 2026?
So far, Cyclospora cases have been reported in Alaska, Colorado, Connecticut, Florida, Georgia, Illinois, Louisiana, Massachusetts, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Tennessee, Texas, Virginia, and Wisconsin. New York reported the highest cases, and has the highest number of illnesses in any state reported so far.
Monroe County in Michigan has its own cases of interest and has begun an investigation in an attempt to identify the source of the cases. Health departments across the other affected states are working in collaboration with the CDC and FDA to identify if any of the clusters are related to a specific farm, distributor, or product.
Is North Carolina Part of the Current Parasite Outbreak?
There are cases in North Carolina. North Carolina is one of the 17 states in the U.S. with reported cases, having over 60 cases of the Cyclospora parasite with no reported hospitalizations as of July 2023. Health officials in North Carolina have reported that the process of identifying an original source can take weeks to months, as there is a long incubation period of 2 – 14 days, and when the patients are interviewed, they generally do not remember what they ate, but can only recall their food preferences.
North Carolina has been the location of numerous other outbreaks in the past. In 2024, an outbreak from restaurants in Wake County affected over 130 people, and investigations took months to determine the cause,e as the primary source of the outbreak was a shrimp and parsley salad. As a result of this outbreak, the North Carolina Department of Health and Human Services developed a collaborative task force with other involved agencies to expedite investigations and interviews.
What Does Explosive Diarrhea From Cyclospora Actually Feel Like?
At first, the most visible symptom of Cyclospora infection is diarrhea. It’s frequent and often described as explosive. After a while, most people experience bloating and cramping, as well as loss of appetite and significant weight loss. Even after the other symptoms start to improve, there is a general and lingering fatigue. Less common and unusual symptoms are low-grade fever, body aches, and a headache, which may all cause this infection to mimic the flu and lead to confusion and disorientation. Because of the severity of this infection, vomiting, as an unusual symptom, may also be common.
One of the more odd features of cyclospora is that untreated infections can relapse several times, with the infection fading and cycling back to untreated symptoms. The infection is usually not symptomatic until about a week after the parasite is ingested, but symptoms can start as early as two days and as late as two weeks or more.
How Do You Catch Cyclospora Cayetanensis?
Because of the transmission cycle of Cyclospora cayetanensis, the parasite can easily be dispersed and prove difficult to track. The cycle of the parasite begins if a person ingests oocysts by eating or drinking contaminated produce. It does not spread through casual contact like other stomach viruses. The oocysts shed by an infected person can be in the environment for days to weeks until they mature and can infect another person. This is unlike most stomach viruses, where the virus spreads among the people in a household.
Because of the lengthy cycle of the parasite, it can prove very challenging to track most outbreaks of Cyclospora. The infected person can forget what produce was eaten and where it was purchased, and the contaminated produce can leave the store before the person even gets the chance to report the infection.
How Long Do Cyclosporiasis Symptoms Last?
Without treatment, symptoms can last a few days to over a month, with diarrhea coming and going in those days. As for treatment, one antibiotic is prescribed for confirmed cases, and people begin to feel better a few days after starting the medication. Diarrhea, along with other symptoms, tends to resolve with the medication, but fatigue will persist for days or even weeks.
What Should You Do If You Think You Have Cyclosporiasis?
If you suspect Cyclosporiasis, reach out to your healthcare provider for Cyclospora testing specifically, as it is not a routine part of a stool culture. It is imperative to get tested if you are experiencing symptoms such as watery diarrhea for over 5 days, especially after consuming fresh produce and herbs or after travel to a location endemic to the parasite.
If a diagnosis is confirmed, it is likely the Department of Health will be in contact for information about your consumption in the two weeks before the confirmed illness. Please provide as much detail as possible, including dressing, garnish, or any embellishment. This is valuable information to help close potential infection gaps.
How Can You Protect Your Family From the Cyclospora Outbreak?
Before eating fresh produce, wash your hands and wash the produce, especially berries, leafy greens, cilantro, and basil. Cyclospora doesn’t respond to many sanitizing methods, but a rinse under running water will help you keep it in check at home.
When traveling to places where Cyclospora is common in the environment (typically in tropical and subtropical places), only eat food that has been cooked, and do not drink water from the tap, and do not drink water from the streams or lakes. As the cause of the outbreak has not yet been identified, there is no specific food to avoid, but the best protection you have until the investigators narrow down the cause is good hygiene with food and washing hands.
Staying Ahead of This Summer’s Cyclospora Risk
The cases of Cyclospora-related outbreaks the CDC has confirmed this year, especially the cases of explosive diarrhea, show how one batch of food can infect a dozen states. Although the CDC has not confirmed the source, the number of infections is well over 145 at this point, and the safest option is not to wait it out at home. If you notice diarrhea that comes and goes after eating fresh foods and diarrhea that lasts several days, wash your food and hands, and call your doctor and ask for a Cyclospora test.
Frequently Asked Questions
What is the parasite behind the 2026 explosive diarrhea outbreak?
Cyclospora cayetanensis is an illegal alien, a microscopic parasite, and the causative agent for the intestinal infection known as cyclosporiasis, the chief symptom of which is frequent, watery diarrhea of varying degrees of explosiveness.
How many states have reported Cyclospora cases in 2026?
At least 17 states as of mid-June 2026 reported cases of Cyclospora, including the following: New York, North Carolina, Texas, Pennsylvania, New Jersey, and Illinois. The CDC is still investigating numerous multi-state case clusters.
Is the parasite outbreak in North Carolina serious?
There are more than 60 reported cases in North Carolina. However, there have been no reported hospitalizations. The NC State Health officials are working with the CDC and the FDA to help identify the source.
Can Cyclospora spread from person to person?
No. The oocysts of the parasite take days to even weeks to develop in the environment to become infectious. Therefore, cyclosporiasis is not contagious like a cold or a stomach virus.
What foods are usually linked to Cyclospora outbreaks?
Prior outbreaks have been associated with infection via fresh cilantro, fresh basil, raspberries, snap peas, and bagged salad kits. The source of the 2026 outbreaks is still not known.
How long does cyclosporiasis last without treatment?
In the absence of treatment, the symptoms can be persistent for several days to weeks, or even longer, and the diarrhea can intermittently return.
If your last salad or smoothie made you feel a little off, don’t just wait for it to pass. Get in touch with your healthcare provider and request Cyclospora testing. Remember to check back with USA Times Square for updates while the CDC works on narrowing down the source of the outbreak.
